miniDSP DDRC User Guide
Contents
1. 1 Connect the Dirac Series audio processor into your system and install ee 0e software See Section 2 Installation and Setup 5 z z JJ U 2 Run a series of acoustic measurements using the Dirac Live isa O KONOR aa Ia OEO e e e e char 4 Calibration Tool Stereo for miniDSP program to capture the Be wn NA apren acoustic behavior of your speakers and room See Section 3 st ps Acoustic Measurement O E gce ee Y Fronta View v 3 Generate digital room correction filters that will be executed by the Dirac Series processor Up to four filter sets can be downloaded into the processor for easy real time recall and auditioning See Section 4 Filter Design 4 Once the digital room correction filters are designed and m rel utput volume G B ji downloaded the computer can be disconnected as computer managen till ETS ey connectivity is not required for normal listening See Section 5 Using the Dirac Series audio processor miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 10 SNNN 2 INSTALLATION AND SETUP 2 1 HARDWARE CONNECTIVITY All connections to the Dirac Series audio processors are made on the rear panel 2 1 1 Digital audio connections DDRC 22D Connect up to three digital sources to the DDRC 22D inputs AES EBU on XLR S PDIF on RCA or optical TOSLINK Connect one of the digital outputs to your2. If you have not purchased a Dirac license before use the New User screen on the left If this is not your first Dirac license use the screen on the right Dirac Serial number activation Dirac Serial number activation mgre re A New User Apat your Dirac online shop account and password to activate your Dirac product serial number If you already have a Dirac online shop account and know your login credentials If you do not have an Dirac online shop account click here then click here me myplace com me myplace com eececece LETETT Note if you purchase more than one Dirac Series processor each will need to be activated with its unique serial number Use the screen on the right and enter the serial number of each processor and they will in turn be added to your license 2 2 4 License validation Start the Dirac Live Calibration Tool Stereo for miniDSP program It will ask you to validate your software license Enter the license credentials that you obtained in the above step and then click on Validate Username po Password po Please enter your username and password and press Validate Validate You will need to be connected to the Internet to validate your license Any active firewalls will need to have HTTP normal web traffic enabled miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 14 SN 3 ACOUSTIC MEASURE
3. spor O O Dirac Live oirac uve O Technology Front panel layout DDRC 22D FILTER SET O ANNIN O O Dirac Live O O Technology DIRAC LIVE Front panel layout DDRC 22A 5 1 STATUS INDICATORS The current status of the processor is indicated by a set of LEDs Filter Set Indicates the currently selected filter set 1 through 4 Digital Source Indicates the currently selected digital input DDRC 22D only Dirac Live Indicates that Dirac Live filtering is turned on 5 2 FRONT PANEL CONTROLS The Dirac Series audio processors use a minimalist physical control design with a single control knob To change the volume Rotate the control knob clockwise to increase the volume and counter clockwise to decrease it miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 31 hn To change the selected filter set Briefly press the control knob The Filter Set LED blinks quickly Rotate the control knob until the desired filter set LED is blinking Press the control knob again and the selected LED will remain steady In the case of the DDRC 22D this will advance to digital input selection To change the selected source DDRC 22D only Briefly press the control button twice The Digital Source LED blinks quickly Rotate the control knob until the desired source LED is blinking Press the control knob again and the selected LED will remain steady 5 3
4. Magnitude response dips In some cases it may be helpful to adjust the target curve to follow dips in the magnitude response This can occur where for example the listening area is very close to the speakers and the measurements exhibit a dip caused by the vertical response of the speakers themselves In such a case adjusting the magnitude response to follow the dip will avoid making the speakers sound worse elsewhere in the room You may also wish to try a different set of measurement locations miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 2 LIN DS P Unlinking channels In almost all cases the left and right channels should remain linked for target curve adjustment to ensure that both speakers produce the same response across the listening area In certain unusual circumstances such as where the magnitude response dip discussed in the previous point shows up in only one speaker you can try unlinking the left and right channels and making separate adjustments 4 2 4 Saving and loading target curves To allow you to experiment with different target curves you can save a target curve to a file and reload it at a later time The default directory for these is C Users User AppData Roaming Dirac OEM MiniDSP Targets but you can store them in any location in your file system To save a target curve click on the Save Target button If the left and right channel
5. DAC or other device with a digital input All digital outputs are simultaneously active so multiple output connections can be made if necessary From digital source To DAC or digital amplification From digital sources A The digital outputs of the DDRC 22D operate at 96 kHz sample rate Any connected DAC must support this sample rate The digital inputs of the DDRC 22D accept any sample rate up to 216 kHz 2 1 2 Analog audio connections DDRC 22A Connect the analog inputs to your preamp or other analog source Connect the analog outputs to your amplification All analog connections are via balanced XLR connectors so in the event that your other equipment has only single ended RCA connections use suitable RCA XLR adapters or adapter cables Ras z re koz lt ow g g0 j From analog source To analog amplification miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 11 INN DSP 2 1 3 DC Power The supplied 5 VDC power supply includes a set of interchangeable power pins Fit the correct pins for your country Connect the DC plug to the 5 VDC power socket Digital Inputs Digital Outputs eo 3 o q moh OPTICAL AES EBU OPTICAL AES EBU 2 1 4 USB Computer connectivity is required to perform acoustic measurements in your listening room and to generate and download the digital room correction filters to the Dirac Series
6. INFRARED REMOTE CONTROL Many standard and programmable remote control units can be used with the Dirac Series processors Instead of adding another remote to your collection the processor can learn the control codes of your current infrared IR remote if it supports one of the following remote control codes e NEC e Sony e Philips RC6 e Apple Remote Learning is done with the DDRC 22 utility program After starting the program click on the Connect button To initiate learning simply click on one of the function buttons in the IR Learning box Master Mute Volume Up and so on Then point your remote at the processor and click on the button that you want to use for that function A dialog will appear to show that the code was recognized If the processor does not recognize the remote control code then it will time out and display a message saying that no IR code was detected DDRC 22 Utility DDRC 22 Utility Master Volume x y Mute Connect x Mute onnected Get Activation Serial Number gt Default Restore All to Default IR Leaming IR Leaming Master Mute Master Mute vV Volume Up Volume Up vV 3 e Fo i Volume Doi Volume Down IR Remote learning succes stul Volume Down v SPDIF j SPDIF Learn OK TOSLINK a trar Learn AESIEBU Learn Config 1 Learn Config 2 Learn Config 3 Learn Config 4 Learn Learn FIR Bypass miniDSP Ltd Hong Kong Email info minidsp com Features and specificati
7. at the top right e To load a filter set into a slot that already has filters loaded first delete the loaded filter set by dragging it onto the trashcan icon Then drag and drop the current filter set onto the now empty slot There are two ways of generating different filter sets to load into the processor e Return to the Filter Design screen change your target curve and click on Optimize again Then proceed to the Export screen and drag and drop the new filter set onto an empty slot e Load another project Its most recently generated filter set can then be dropped onto an empty slot Here is an example screen with three loaded filter sets and with Dirac Live filtering enabled Filter On Output volume A miniDSP Ltd DDRC 22 Channel Slot 1 Slot 2 Slot 3 Slot 4 1 Left Left Left 2 Right Right Right miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 30 ANNIN 5 USING THE DIRAC SERIES AUDIO PROCESSOR Once the desired correction filters have been downloaded into the Dirac Series audio processor the computer is not required and can be disconnected The front panel and or an infrared remote can be used to control e Master volume e Master mute remote control only e Source selection DDRC 22D only Dirac Live filtering on off remote control only Filter set selection DIGITAL SOURCE FILTER SET Oona NNN AES EBU O
8. can save it to a file see Saving and loading target curves below miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 25 SNNN DSP 4 2 2 Editing the target curve You can edit the target curve to set any desired magnitude response see Guidelines for target curve design below This is done with the use of anchor points shown as orange dots on the curve e Drag an anchor point to move it e Double click on the target curve to add an anchor point e Double click on an anchor point to delete it The regions to the left and right of the response graphs that are shaded in a darker color are excluded from correction You can adjust the range of frequency correction for your system and environment For example low frequency noise traffic machinery may be present in some environments so it is best to adjust the frequency range to exclude these frequencies from the correction Or you may be happy with the in room response at higher frequencies so you can set the frequency region to limit correction to the modal region up to 300 Hz in a typical room To alter the frequency region drag the grey handles on either side of the graph Note that you can t drag these handles over an anchor point so you may need to move or delete an anchor point that is in the way Click and drag to move anchor point Double click to add anchor point Double click to delete anchor po
9. for any damage that may result from the improper use or incorrect configuration of this product Please read this manual carefully to ensure that you fully understand how to operate and use this product as incorrect use or use beyond the parameters and ways recommended in this manual have the potential to cause damage to your audio system Please also note that many of the questions we receive at the technical support department are already answered in this User Manual and in the online application notes on the miniDSP com website So please take the time to carefully read this user manual and the online technical documentation And if an issue arises with your unit please read through the Troubleshooting section first Thank you for your understanding WARRANTY TERMS miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one year from the invoice date Our warranty does not cover failure of the product due to incorrect connection or installation improper or undocumented use unauthorized servicing modification or alteration of the unit in any way or any usage outside of that recommended in this manual If in doubt contact miniDSP prior to use miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 5 PACKAGE CONTENTS Your Dirac Series package includes e One Dirac Series high resolution audio processor e One universal 5
10. in the green When done click the Proceed button miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 19 e o Sap SNNN DSP 3 4 RUNNING THE MEASUREMENTS Measurements are performed on the Measurements screen 1 Select the type of 2 Place microphone in 3 Press start to begin listening area the highlighted position taking a measurement Chair 4 p e e A Wet e o P Start S amp S Frontal View v l 4 3 4 1 Listening environment The Dirac Live Calibration Tool Stereo for miniDSP presents two different listening environments as a visual guide to positioning the microphone for each measurement Chair for a single listening seat and Sofa for multiple listening seats Select a listening environment by clicking on the chosen icon The center of the screen contains a pictorial representation of the selected listening environment with dots marking the microphone locations Completed measurements are shown in green while the next measurement to be done is highlighted in yellow and has a red arrow marker pointing to it A drop down menu underneath selects three different views which should be used to help you place the microphone in the correct location 4 v e t 7 a o r r f _ a Top View Yv Frontal View v Oblique View Vv o e o gt o BO e A Top View z Frontal View v Oblique View Y
11. normal high listening level 4 Place the microphone in the center of the listening area and play the test noise on every channel _ Ifyou are using a microphone pre _amnither unth a nain contr cot CO Event Log Feedback 1 0 4 Build 2454 A w The main areas of the screen are Logo and status progress bar This area shows a progress bar with current status when the program is performing calculations Screen selection tabs Each tab selects a screen that is shown in the main display area These are generally worked through in order from top to bottom This section covers the first four tabs the final two are covered in Filter Design Load and save a project Each measurement project can be saved to a file and reloaded at a later time See Saving and loading projects Back to previous proceed to next Use these two buttons to advance to the next screen when each is complete or to go back to the previous screen to make alterations The tabs at the left can also be clicked on directly Help open close Click on the small Help divider at the right of the screen to open a pane with help on the currently selected tab Click on the divider again to close the help pane miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 17 Ni 3 3 1 Sound System tab The Sound System tab is preset for you provided that you have your Dirac Series audio p
12. signal audible as a frequency sweep through the left speaker then the right and then the left again While the measurement proceeds the time domain graph of the captured audio signal is displayed at the bottom of the measurement screen This graph is related to the magnitude response but is not the same display Its purpose is to verify that the recorded signal level is in a suitable range At the completion of the measurement the status bar will update with a progress indicator as the program performs calculations on the measurement If the measurement was successfully captured the red arrow marker will advance to the next location to be measured If the program indicates that the measurement was not successful you will need to take corrective action The most common error is related to signal level e The measurement signal is too low to ensure a clean capture e The measurement signal is too high and the audio signal has exceeded the maximum level clipping This is shown in red on the signal graph In either of the above cases go back to the Output amp Levels tab and adjust the output volume or microphone input gain Then re run the measurement You do not need to redo the measurements you have already successfully completed even if you change volume or gain miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 21 Ni 3 4 3 Viewing and redoing measurements C
13. IN DSP DIRAC SERIES HIGH RESOLUTION AUDIO PROCESSORS WITH DIRAC LIVE TECHNOLOGY User Manual DDRC 22A DDRC 22D f Dirac Live miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 1 Revision history Revision Description Date 090 Initial public release 26 Mar 2014 4 April 2014 miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice nin TABLE OF CONTENTS important informat ON eiciia naaa EEEE E ened sans E ARENAEN EATERS EEEE ETE ELEN 5 System REQUIEN S siisii ARARA R 5 NS Cla ra A A 5 WN TN eaa EAA AAA AOA T AAE OEA OAA OAE E E E 5 PIC Ee COM OIE ee E E ee 6 A Note on this Manua 2 nasensecssenaseusanssensacesneascnaeeasanasenaseaanasasaameaaiswenesernses seus cuss oxen EERE ENEEE ERE ER EECERE ELSE ESK EREEREER ERREEREA 6 1 POU TOV T N aE E EEEE EE eee eee EEEE 7 1 1 Typical system conie uratiOnS serseri rE E E E E EEEE EEEE Er EEr 7 1 2 HOW BHIC WOK aean E E ee ne ee ee eee eee 8 1 3 The Dirac Series Dirac Live design Process ccccccccseccccsscecceuceceecsceuecsceuececauecscaecesauececaneceeaneeeean 10 2 Installation and SetU iins TA EEE 11 2 1 Hardware connectivity cccceecsecceccsecseceecescceecseceeceeeeseseeeeeceeceeeeueeeeeeeeeeeeeceeeeeeeeeeeceeeeseteeeeeeeeeeeeeeees 11 2 1 1 Digital audio connections DDRC 22D esessesssssssessrssrnsrrsseserer
14. MENT The Dirac Live Calibration Tool Stereo for miniDSP uses a set of measurements made in your listening room to calculate correction filters for the left and right channels The measurements are made using the Dirac Series audio processor and the supplied UMIK 1 measurement microphone No additional hardware or connectivity is required 3 1 LOUDSPEAKER AND MICROPHONE POSITIONING Prior to performing acoustic measurements loudspeaker and listening positions should be optimized Some experimentation will be required to obtain the results that you think best starting with the recommendations of the loudspeaker manufacturer With Dirac Live you have more freedom with loudspeaker placement but the best result will still be achieved if optimal loudspeaker placement is used together with Dirac Live Many loudspeakers perform best away from the walls both the front wall behind the loudspeakers and the side walls Experiment with toe in many loudspeakers benefit from pointing directly at the listening position or even slightly in front The listening position should also be away from the rear wall as placing the listening chair or sofa right against the wall will result in increased early reflections and changes in timbre ee T onuren i Before measurement i adjust speaker toe in for best subjective results t ee E S J 4 A as h a The first measurement must be in i The second to ninth measurements the center of the listeni
15. To download the unique calibration file for your microphone go to the UMIK 1 page and enter your microphone s serial number It is in the form xxx yyyy and labelled on the microphone Use Save As in your browser to save the data to a text file for example UMIK 7001870 txt Then click on the Load File button and select your calibration file Recording device Recording channel Microphone Umik 1 Gain OdB Y Y Microphone calibration file UMIK 7001870 txt Load file Clear Once you have verified that this screen is correct click the Proceed button 3 3 3 Output amp Levels tab On the Output amp Levels tab set Output volume quite low If you have another volume control down stream of the DDRC set it about halfway or 20 dB if digital and increase it later if needed Click on the Test button for the left channel and gradually increase the output volume until it is at a moderate level such that your voice would have to be raised to converse with someone sitting next to you Now increase the Input gain slider until the blue bar on the level meter reaches up into the green section as shown below Input gain lll Output volume Channel name Output channel Test Level Left Output 1 v L H up Click again on the Test button for the left channel to stop the test signal Then click on the Test button for the right channel If necessary adjust Input gain or Output volume so that both channels are
16. VDC power supply with interchangeable power pins One USB cable for computer connectivity One tripod microphone stand One printed Quick start Guide A NOTE ON THIS MANUAL One UMIK 1 calibrated measurement microphone with USB cable One license for Dirac Live Calibration Tool Stereo for miniDSP This User Manual is designed for reading in both print and on the computer If printing the manual please print double sided The embedded page size is 8 4 x 11 Printing on A4 paper will result in a slightly reduced size For reading on the computer we have included hyperlinked cross references throughout the manual In addition a table of contents is embedded in the PDF file Displaying this table of contents will make navigation much easier e In Adobe Reader on Windows click on the bookmarks icon at the left The table of contents will appear on the left and can be unfolded at each level by clicking on the icons e In Preview on the Mac click on the View menu and select Table of Contents The table of contents will appear on the left and can be unfolded at each level by clicking on the triangle icons LP Important Information EP 1 Product Overview P 1 1 Typical system configurations P 1 2 How Dirac Live works P 1 3 The DDRC Dirac Live design process El P 2 Installation and Setup ca P 2 1 Hardware connectivity iP 2 2 Software installation EJ LP 3 Acoustic Measurement P 3 2 Connections for a
17. While minimum phase and linear phase filters are relatively easy to design they are tightly constrained in their impulse response characteristics neither can make a desired change to the magnitude response independently of controlling the impulse response In some cases they may even make things worse Mixed phase filters are more difficult to design but the audible performance of Dirac Live is due to its success in using mixed phase filters to make the system response across the whole listening area more closely resemble that of an ideal speaker The energy from the direct wave and from early reflections is optimally combined to arrive as a single wavefront to the listener Late reflections are left largely untouched being corrected only for their spectral coloration as they contribute to a larger more enveloping soundstage Target magnitude response Uncorrected magnitude response Corrected magnitude response Illustration of Dirac Live magnitude response correction Ideal Uncorrected Corrected impulse response impulse response impulse response Illustration of Dirac Live impulse response correction miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice LIN DSP 1 3 THE DIRAC SERIES DIRAC Live DESIGN PROCESS The design process for optimizing your system with the Dirac Series audio processor and Dirac Live is summarized as follows
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19. coustic measurement P 3 3 Configuring for measurement P 3 3 1 Sound System tab P 3 3 2 Mic Config tab P 3 3 3 Output amp Levels tab fP 3 4 Running the measurements P 3 5 Saving and loading projects LLP 4 Filter Design E P 5 Using the DDRC i P 6 Additional Information Adobe Reader on Windows 5 Go Tools Bookmarks Windo Content Only X 981 0 Q Q Thumbnails x2 view Zoom MAE EESO TE DDRC User Manual Highlights and Notes X 384 Contact Sheet 985 gt Important Informati Y 1 Product Overview 1 1 Typical system configurations 1 2 How Dirac Live works 1 3 The DDRC Dirac Live design process Y 2 Installation and Setup gt 2 1 Hardware connectivity 2 2 Software installation v 3 Acoustic Measurement 3 2 Connections for acoustic measurement Y 3 3 Configuring for measurement 3 3 1 Sound System tab 3 3 2 Mic Config tab 3 3 3 Output amp Levels tab gt 3 4 Running the measurements 3 5 Saving and loading projects gt 4 Filter Design gt 5 Using the DDRC gt 6 Additional Information Preview on Mac miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice ANNIN 1 PRODUCT OVERVIEW Thank you for purchasing a Dirac Series 24 96 high resolution audio processor powered by Dirac Live the world s premier room correction solution We are delighted to offer you this software and hardware combination the fruit
20. dspeaker dispersion on the measured in room magnitude response In addition Dirac Live corrects the system s impulse response which reflects how the system responds to a sharp transient such as a drumbeat Reflections diffraction resonances misaligned drivers and so on all combine to smear out the transient An ideal loudspeaker has none of these so correcting the impulse response makes the speaker in the room behave much more like that ideal loudspeaker The impulse response is a critical factor for accurate sound staging clarity and bass reproduction Dirac Live employs a sophisticated analysis algorithm to make the optimal correction across the whole listening area not just at a single point Differences between the impulse responses of the two loudspeakers at the listening position will also affect soundstage and imaging The more similar the impulse responses the more easy it is to trick the brain into thinking that the loudspeakers are not really there and that the sound emanates from a virtual stage spanned by the physical speakers miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 8 SNNN DSP Dirac Live accomplishes this using mixed phase filters filters that match a desired magnitude response and generate a customized impulse response This contrasts with the minimum phase and linear phase filters that are commonly used in audio applications
21. er DSP internal processing path 96 kHz 32 bit floating point processor 4 filter sets stored selectable from front panel or IR remote Learning remote capabilities NEC Philips Sony Apple Controls master volume mute digital input selection filter set selection Dirac Live filtering on off 5 VDC single supply 600mA 2 1 mm center positive 41 5 x 214 5 x 206 mm miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 33 ANNIN 6 2 TROUBLESHOOTING The following table lists the most common causes of issues with the DDRC If following this table does not provide a solution see Obtaining Support below Symptoms Troubleshooting recommendation DDRC 22 doesn t appear in the Sound System tab The measurement test signal produces no output Insufficient recording level No audio when playing music Cannot install software 3 No input from measurement microphone Check that the USB cable is firmly connected Check that you have the miniDSP version of the software installed called Dirac Live Calibration Tool Stereo for miniDSP Go to the Sound System tab and click the Rescan button Check the Output volume slider Ensure that the Dirac Series processor is connected correctly into the audio system DDRC 22D only Confirm that the connected DAC accepts 96 kHz sample rate on its input Check that the downstream device has the Dirac S
22. eries processor selected for input Check that any downstream volume control is not set to zero Check that no downstream device is muted Check that the USB cable to the UMIK 1 is securely seated Check that the UMIK 1 is selected in the Mic config tab Increase microphone level in the Output amp Levels tab Go to the Control Panel and view the Recording tab of the Sound pane Select the UMIK 1 and view its Properties In Levels set the gain to 100 Increase system output volume Check that the processor is not muted Check that the processor master volume control is not turned down Check that the downstream device has the Dirac Series processor selected for input Check that any downstream volume control is not set to zero Check that no downstream device is muted Confirm that you downloaded and installed the required frameworks first see Software Installation miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 34 INN DSP 6 3 MCU FIRMWARE UPGRADE miniDSP may occasionally provide an update to the Dirac Series processor MCU firmware to enable new features To update the MCU firmware 1 Download the latest utility software from the User Downloads section of the miniDSP website and unzip it 2 With power removed from the Dirac Series processor remove four screws and detach the lid 3 Press the button shown in the photograph below and app
23. esrrrsrrsrrsrrsrrerersersrrsrrsrerereeeseeserseens 11 2 1 2 Analog audio connections DDRC 22A cccccecccsecceeceencececeenceenceeeeceecteuceenceeeeeectuceeneeeeeeeeeets 11 2 1 3 DC PONEI raan AAA AAAA A EAS 12 2 1 4 U D E E E EE E E 12 2 2 Sonware installation and cense ra CUI al ON eiren re Er n N E E N EEEO 13 2 2 1 PEWO 1S TO E EE A eeeteteeee occ saceeree se 13 2 2 2 ORW NSA O oserei errre ere eE SEE 13 2 2 3 HC Me ACUAN ON eerren rererere rer rr 13 2 2 4 Licens enad O e E Gar neesever snr seen eracuiaieinoareeeteseensacesesess 14 3 Acoustic Measurement ssssssrsrsrsrssssrsrsesesesrsrsrsrsrsrsrsesererererersrsrsrsesesererererosrersrsrsrsrsesesererererererererersrsrsesee 15 3 1 Lo dspeaker and microphone POSITIONING ssiisisisirisisssisisininisserrivE verts inr SSiN Eran TNES EEUN RNENSE EAr U UNNS E SEEEN NNE 15 3 2 Connections TOF ACOUSTIC meas remet cisnsssacssssenssavevaveanvssandebesseubueebuesbseubvacbencsuneyuewsuostunseueieebectereee 16 3 3 Conngurine Tor MeasuremeNi assins E 17 3 3 1 SELEN O OVS COIN CaO AEE E EA A EAE AAAA 18 3 3 2 PVE COGS E E E EE ster steeetucteastsastsecsseeseresee 18 3 3 3 OARE E E 3 R RE EEN sr NEE PEN PINEA E ns NE on oe 19 3 4 RUNNING the measurements vccccrevccesecerenescieressancsaedenesunesstetstornbetauseeenssinidand vadGredaesdanedbnsdaosbasedbeadoesteensers 20 3 4 1 Listening environment cccccecsecsececsececcecsececsesececseeesseeecseseesesecsesessesecseseeeecsesessesecaeseceesseaes
24. h a The specific product you are having an issue with b Aclear explanation of the symptoms you are seeing c A description of the troubleshooting steps see Troubleshooting above you performed and the results obtained miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 36
25. has shipped your installation software downloads will be available at the User Downloads section of the miniDSP website under the Dirac Series heading http www minidsp com userdownloads Download two installation zip files the Dirac Live Calibration Tool Stereo version for miniDSP and the DDRC Configuration Plugin Unzip each file and double click to run each installer Follow the on screen instructions to complete installation 2 2 3 License activation 1 Start the miniDSP DDRC 2x2 utility program It will appear as shown on the left below 2 Connect your Dirac Series processor to your computer via USB then click on the Connect button It will change to a green tick 3 Click on Get Activation Serial Number The program will get your unique serial number from the connected DDRC and display it as shown on the right below DDRC 22 Utility Master Volume x Q Mute Connect About IR Learning Master Mute VEENA The serial number is 42X olume Up Volume Down Please go to http www minidsp com dirac series activate SPDIF to register and activate your product TOSLINK AES EBU oK Config 1 Config 2 Config 3 Config 4 FIR Bypass miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 13 SNNN DSP 4 Using this serial number activate your license on the Dirac Series activation page http www minidsp com dirac series activate activate
26. info minidsp com Features and specifications subject to change without prior notice 28 ANNIN 4 4 DOWNLOADING AND MANAGING FILTER SETS The Export screen initially shows four empty slots for filter sets a filter set is one filter for the left channel and one filter for the right channel Filter Off Output volume Gali miniDSP Ltd DDRC 22 Channel Slot 1 Slot 2 Slot 3 Slot 4 The two main controls on this screen are Filter Turn this on to enable the Dirac Live correction filters The indicator on the front panel of your Dirac Series processor will light when filtering is enabled DIRAC LIVE DIRACLIVE Output volume Adjust the slider to adjust the output volume of the processor Once the computer is disconnected output volume can also be adjusted from the front panel or by remote control see Infrared remote control below miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 29 SN The Dirac Series audio processor can hold up to four filter sets in its internal memory Filter sets are managed with a drag and drop metaphor e To load the most recently generated filter set into the processor drag the box at the top left labeled Auto target in the example and drop it onto an empty slot e To remove a filter set click on its name oriented vertically at the left drag it from the slot and drop it on the trashcan icon
27. int Click and drag to change correction region If the left and right channels are linked the same target curve is used for both channels To create separate target curves for the left and right channels unlink the two channels as described above in Working with graphs miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 26 nin 4 2 3 Guidelines for target curve design Care should be taken to create a target curve that works well with your speakers and room as well as suiting your personal preferences Small changes to the target curve can have significant effects on the tonal quality of the system so it is important that you experiment with different target curves to find the optimum If you initially don t achieve a satisfactory result please ensure that you have spread your measurements over a sufficiently large area and with sufficient variation in height The following guidelines will help you understand how to adjust your target curve Low frequency extension and boost All loudspeakers have a natural low frequency roll off Setting the target curve to boost the region below the speaker s natural roll off frequency may result in overdriving the speakers especially with smaller home loudspeakers and depending on your listening habits A system with capable subwoofers integrated into it however will support much more low frequency output The auto targe
28. lick on the green dot for any completed measurement to display its measured time domain response graph After clicking on a green dot a small red X will appear next it Click on the X to delete the measurement The status bar will indicate that the program is recalculating parameters Click to remove the measurement To redo a measurement delete it move the microphone to the appropriate location and click on Start Note if more than one measurement is deleted the marker will move to the lowest numbered one 3 4 4 Completing the measurements After each successful measurement the location marker red arrow will advance to the next location Move the microphone to that location using the three views top front oblique as a guide to positioning it in the correct location Then click on Start again Repeat this process until all nine locations have been successfully measured Note that it is good practice to save the project periodically while performing measurements see Saving and loading projects below Once all nine measurements have been completed you can advance to the Filter Design screen by clicking on the Proceed button or directly on the Filter Design tab at the left A It is important that all nine measurements are completed in order to ensure best results from the optimization algorithm Being patient and thorough will pay audible dividends 3 5 SAVING AND LOADING PROJECTS Each set of measurements a
29. ly power while holding the button down Release the button Only the first Filter Set LED on the front panel will light to indicate that the processor is in boot loader mode HA af AO in gt co A G 5 G wy x eve t P P g e i A k o X tee mi ol eat ie COC zae g P L eiet lel HRH BAL ae STRESS Ts amp tj e D JE As 4 Fe aeeoa A Mnvnbqeeyqunepoaytn TL ELLE LG GL ETETEA ETETETT TETEA Fovaletatedel ou ot ol tet ol et et el EEE EEEELEL E 1 i r L uy Bina ggj ge ge ae je 4 Connect the processor to your computer via USB 5 Double click on the miniDSP_Upgrade_Tool to run it The status line should display Device attached Device attached miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 35 nin 6 Click on the Open Hex File button and select the hex file included in the download 7 Click on the Program Verify button The status bar will indicate progress Do not disconnect the processor during the firmware upgrade 8 Click on the Reset Device button 9 Disconnect power and re attach the lid 10 Reapply power and the processor can be used as normal 6 4 OBTAINING SUPPORT 1 Check the forums on miniDSP com to see if this issue has already been raised and a solution or solutions provided 2 Send an email to info minidsp com wit
30. miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 20 nin Note that it is important that measurements are performed over a sufficiently broad area If the measurement area is too small the result may be over correction that will sound dry and dull If using the Chair listening area spread the microphone positions over a circle with a diameter of at least a meter three feet The microphone should be varied in height from the central position by at least 30 cm one foot up and down If using the Sofa listening environment spread the measurement locations over the full listening area and vary the height up and down by at least 30 cm one foot While the locations indicated are recommended you can use a different set of locations if necessary The important thing is to ensure that the measurement locations are spread over the whole listening area and that the microphone is moved a sufficient distance vertically as well as horizontally In some cases such as when the listening area is very close to the loudspeakers the size and in particular the height of the measurement area can be reduced to avoid discrepancies caused by varying output response from the speakers themselves 3 4 2 Executing measurements With the microphone in place at the central location and pointed between the two speakers click on the Start button The Dirac Series audio processor will generate a test
31. nd the associated configuration settings are a single project The project should be saved at regular intervals This is done by clicking on the Save button The default location for project files is My Documents MiniDSP Projects A project can be reloaded at any time by clicking on the Load button This enables you to generate new correction filters for different target curves at a later date see Filter Design or to redo any of the measurements Note if you wish to change from the Chair to the Sofa listening environment or vice versa you will need to start a new project miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 22 ANNANN DSP 4 FILTER DESIGN Once the full set of measurements has successfully been taken Dirac Live Calibration Tool Stereo for miniDSP has the acoustical information it needs about your loudspeakers and listening room to create the correction filters 4 1 WORKING WITH GRAPHS The Filter Design screen shows a number of plots that can individually be turned on and off with the checkboxes near the top of the screen 4 Avg Spectrum before E Target LMPULSE U Avg Spectrum after level dB No rmalized f f f hh A i N i inal i F f AAS f n ot bo Mi MA inal M y N WW A PS 10K 20K Frequency Hz Optimize Auto Target Load Target Save Target Avg spectrum before The average of the measured mag
32. ng area are spread around the listening area A total of nine measurements must be taken with the microphone located in different positions in the room and pointed between the two speakers The first measurement must be taken at the central location of the listening area as this location sets the levels and delays of each speaker Usually this location will be an equal distance from both speakers but it is not necessary Dirac Live will adjust if it is not Eight more measurements are then taken at locations spread around the listening room and at different heights from the floor miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 15 SIWN DSP 3 2 CONNECTIONS FOR ACOUSTIC MEASUREMENT The figure below shows a typical connection diagram for performing acoustic measurement This example uses the DDRC 22D No changes to existing audio connections are needed Simply 1 Connect the supplied USB type A to type B cable from the processor to a USB port on the computer 2 Connect the supplied USB type A to mini type B cable from the UMIK 1 to a USB port on the computer Digital audio Source UTN DRIE EET USB USB Control om 0 ee Bmw Computer Digital audio DDRC 22D Analog audio DAC Integrated amp Fin x gt Loudspeakers UMIK 1 USB microphone f f f ff i ff A Place the UMIK 1 microphone into the mic
33. nitude responses These plots are shown in light blue Avg spectrum after The predicted average magnitude response after correction These plots are shown in green and can only be viewed after filters have been generated with the Optimize button Target The target curve that is the desired in room magnitude response This curve is user adjustable so you can fine tune it to best suit your speakers room and preferences See Designing your target curve below miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 23 ANANN DSP To display the impulse response instead of the magnitude response click on the Impulse button at the top left of the display There are two graphs that can be turned on and off with the checkboxes at the top the measured impulse response shown in light blue and the predicted impulse response after correction shown in light green Avg Imp Resp before SPECTRUM E Ava Imp Resp after To return to the magnitude response click on the Spectrum button The magnitude and impulse response graphs can be viewed at a larger scale To zoom in and out on the response graphs e Drag select a region of the graph to zoom in on it Click the left button move the mouse while holding the button release the button You can then drag select a region again to zoom in further e Double click on the graph to zoom back out to the pre
34. of extensive research and development and years of experience in sound system tuning Deploying a miniDSP Dirac Series 24 96 audio processor with Dirac Live Technology will e Improve the imaging of your sound system e Improve the clarity of the music e Produce a tighter bass e Reduce listening fatigue e Improve the timbre e Remove resonances and room modes e Reduce early reflections Dirac Series processors are available in different versions The DDRC 22A has analog inputs and outputs while the DDRC 22D has digital inputs and outputs Each is inserted into the signal chain in the appropriate location see below for examples 1 1 TYPICAL SYSTEM CONFIGURATIONS The DDRC 22A analog input output is typically inserted into the analog signal chain just before power amplification such as between a preamp or mixing mastering console and power amp Since it has on board volume control it can also be used in systems where there is no other volume control such as between a CD player and a power amplifier Sources Analog Preamp audio USB Analog Power amplifier Control audio miniDSP DDRC 22A Loudspeakers 1 All Dirac Series processors operate with 24 bit 96 kHz resolution miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice hn The DDRC 22D digital input output is typically inserted into the digital signal chain just before D A conversion fo
35. ons subject to change without prior notice 32 nin 6 ADDITIONAL INFORMATION 6 1 SPECIFICATIONS Computer connectivity Digital Audio Inputs DDRC 22D Digital Audio Outputs DDRC 22D Analog Audio Inputs DDRC 22A Analog Audio Outputs DDRC 22A Audio sample rate Resolution Audio processing Storage Presets Infrared remote Power supply Dimensions H x W x D Driverless USB 2 0 control interface for Windows Digital audio source selectable from IR remote or front panel e AES EBU on Neutrik 3 pin female XLR Isolated with digital audio transformer e SPDIF on RCA connector Isolated with digital audio transformer e Toslink on Optical connector The input signal is processed by a high quality onboard Asynchronous Sample Rate Converter for compatibility with most common sample rates 20 216kHz Processed digital audio is available on all three outputs e AES EBU on Neutrik 3 pin male XLR Isolated with digital audio transformer e SPDIF on RCA connector Isolated with digital audio transformer e Toslink on Optical connector Digital audio is always output at a sample rate of 96 kHz Balanced audio inputs on XLR Neutrik connector ADC SNR 114 dB maximum input signal level 2 VRMS or 8 VRMS jumper selectable input impedance 40 kohms Balanced Audio outputs on XLR Neutrik connector DAC SNR 114 dB maximum output signal level 2 VRMS output impedance 560 ohms Input output resolution 24 bit integ
36. processor To configure the processor connect the USB port of the processor to a USB 2 0 port on your computer using the supplied cable For measurements connect the UMIK 1 to a second USB port miniDSP DDRC 22A 22D Digital Inputs i Digital Outputs D D SPDIF 8 P PC Contro USB 2 0 4 A OPTICAL AES EBU AES EBU OPTICAL USB Type B connector USB Mini B connector USB Type A connectors Once calibration and configuration is complete the computer can be disconnected The processor can then be controlled from the front panel or via remote control see Using the Dirac Series audio processor miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 12 SIN 2 2 SOFTWARE INSTALLATION AND LICENSE ACTIVATION 2 2 1 Framework installation Prior to installing the software download and install the following frameworks You will need to accept the license agreements in order to successfully complete the installation If you haven t updated these recently check that you have the latest versions prior to running the miniDSP install programs e Microsoft NET framework version 3 5 or later e Latest version of Adobe Flash e Latest version of Adobe Air e Microsoft Visual C 2010 Redistributable Package for x86 32 bit operating system or x64 64 bit operating system 2 2 2 Software installation When you receive notification that your order
37. r example between one or more digital sources and a DAC From there a regular power amplifier or an integrated amplifier complete the system Variants on this theme include the use of an integrated amplifier with a digital input or the use of a digital input of an A V receiver in which case a separate DAC is not required Digital sources Digital audio Digital audio USB A Control o Integrated amplifier miniDSP DDRC 22D Loudspeakers SS Computer connectivity is used to perform acoustic measurements and generate digital room correction filters Up to four sets of correction filters can be stored on the Dirac Series processor and recalled from the front panel or via an infrared remote Once the processor is fully configured the computer is no longer needed 1 2 How Dirac Live works Each model in the miniDSP Dirac Series of audio processors includes Dirac Live a premium mixed phase room correction technology This technology is used not only in home stereo systems but also in cinemas recording studios and luxury cars As with any room correction system Dirac Live corrects the system s magnitude response often referred to imprecisely as frequency response In contrast to fully automated systems Dirac Live corrects the magnitude response towards a user adjustable target response The target response takes account of the natural frequency range of the loudspeaker system and the normal effects of lou
38. rocessor and UMIK 1 connected to the computer via USB Choose system configuration Preset to Stereo Speaker System This is the only configuration supported by current Dirac Series processors Test signal playback device Preset to DDRC 22 miniDSP Ltd This will ensure that test signals are sent into your audio system via the Dirac Series processor If this is not present check that your Dirac Series processor is connected via USB and powered on and click the Rescan button Choose system configuration Stereo Speaker System Y Test signal playback device DDRC 22 miniDSP Ltd me Reson miniDSP Ltd Y DDRC 22 Once you have verified that this screen is correct click the Proceed button 3 3 2 Mic Config tab On the Mic Config tab set the following parameters Recording device Preset to the UMIK 1 If this is not present ensure that Microphone Umik 1 Gain OdB Y the UMIK 1 is connected securely to the computer via USB and go back to the Sound System tab and click on Rescan Then select the Microphone item underneath UMIK 1 as shown at right Umik 1 Gain 0dB v Microphone lt lt None gt gt Recording channel Select 1 from the drop down menu miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 18 Nw Microphone calibration file Each UMIK 1 measurement microphone is individually calibrated to ensure accuracy
39. rophone stand Position the computer and cabling so that there is enough freedom of movement to move the microphone into the needed locations miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 16 ANNIN 3 3 CONFIGURING FOR MEASUREMENT Start Dirac Live Calibration Tool Stereo for miniDSP if it is not already running Logo and status progress bar Click to show and hide help pane E B Dirac Live Calibration Tool My First Dirac Live Project X Screen tabs EJ DiracLive Output selection and level Q Sound syster adjustments P e Main display area for each selection tab E enna volume slider is set to about EE cea 20 of max If the slider is ae Cae i Lose disabled adjust the physical level control on your hardware device a Ne eme 2 Pressing the Test button on any channel will start playback of a test noise which is used to verify that each output is connected to the corect speaker By pressing the test buttons check that the Channel names given in the boxes to the lait match the physical speakers of your audio system lf the noise of a channel appears in the wrong speaker use the Output channel dropdown menu to select the correct speaker iw Set the volume on your amplifier Load and save a project Back to previous proceed to next screen ea aa ars a a Output level slider until you reach
40. s are linked then the shared target curve will be saved to the file If the channels are not linked then the currently visible target is saved to the file To load a target curve click on Load Target Note that loading a target will erase the current target so be sure to save it first if needed If the channels are linked then the target curve will be loaded to both channels If the channels are not linked then the target will be loaded to the currently visible channel 4 3 GENERATING CORRECTION FILTERS Once you have a target curve set to your satisfaction click on the Optimize button The Dirac Live Calibration Tool Stereo for miniDSP may at this time contact the Dirac license server to verify its license so you will need to be connected to the Internet If a firewall is in place it must allow HTTP normal web traffic to pass The status bar will update with progress of the algorithm Execution may take some time depending on the speed of your computer When the algorithm completes the predicted average magnitude response will be shown in green The predicted impulse response can be viewed by clicking on the Impulse button B Avg Spectrum before V Target IMPULSE Y Avg Spectrum after 0 D E d g w N _ z Z 10K 20K Frequency Hz To download the generated filters into the Dirac Series audio processor click the Proceed button or on the Export tab on the left miniDSP Ltd Hong Kong Email
41. sor cceccsccecceeccecceuceucceccseceuceeceseceuceeeceseeeuetseceseeeueeseceeeeaueteeeeeeeenees 5 1 Bel CEN MACIO S irr an a cece ect ces E OTO OT OON ONENEN EEEE EEEE EEA 5 2 Front panel CONTO S ura AAA E 5 3 PRAT FACE SUS CON O eaaa EEE 6 Additional WAT OFMAU ON stotscessccsscnssnestcasanaseaantesuesacseanssne anes tnessanaeegesoronncoenegencerecareevecereerncevsenrsennsavedercenereucruess 6 1 0 21611 2 0 go a nn nnn nn aoe een er eee et et ee ee ee ee ee ee re 6 2 TOUNO ROONG eerie E NE wD Ne ee nea ae ee ee ee eee a eee eee ae ee 6 3 MOCO FIFIN Ie UDEO eee ee oe re en eee ee re 6 4 Obtaining SUpport 0 ee cecceeccseccseceecceccneceucceceeeeeeceeceeeeeuceeceeecceeeeucteeeeeeeencteeseeeeeuetseeeeeeeecteeeeaeegeetes miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice nin IMPORTANT INFORMATION Please read the following information before use In case of any questions please contact miniDSP at info minidsp com SYSTEM REQUIREMENTS To configure your Dirac Series audio processor you will require a Windows PC with the following minimum specification Intel Pentium III or later AMD Athlon XP or later 2 Gigabytes GB of RAM or higher Keyboard and mouse or compatible pointing device Microsofts Windows Vista SP1 Win7 Win8 Microsofte NET framework v3 5 or later Two free USB 2 0 ports DISCLAIMER WARNING miniDSP cannot be held responsible
42. t estimates the low frequency roll off and curve and in some cases may include some amount of boost if it estimates that the speakers are capable of handing it You should determine by listening whether this estimate is suitable for your speakers and adjust the target curve accordingly High frequency tilt The target curve is the desired measured response of loudspeakers in a room In contrast to measurements made of a loudspeaker during its design under anechoic measured in free space conditions While high quality loudspeakers are usually designed for a flat on axis anechoic response these same speakers when placed into a listening room will tend to have a downward sloping or tilting response at high frequencies due to the effects of limited dispersion at high frequencies and greater acoustic absorption A completely flat in room response is therefore usually not desirable and will tend to sound thin or bright Start with a target curve that follows the natural behavior of your speakers in your room and then experiment with greater or lesser degrees of tilt in the treble region to obtain the most natural timbral balance Low frequency adjustment A completely flat response at low frequencies with complete elimination of peaks due to room modes may sound light in the bass Often a slight increase in the target curve below 100 Hz will give a more balanced sound yet without introducing audible irregularities in bass response
43. vious zoom level or click on the small sign next to the zoom indicator at the top right of the display bx Drag select to zoom in Double click to zoom out bie i miniDSP Ltd Hong Kong Email info minidsp com Features and specifications subject to change without prior notice 24 SNNN DSP By default graphs of both left and right channels are shown together The left and right channels can be unlinked by clicking on the small chain icon next to the channel name at the right of the graphs Then the graphs of each channel can be viewed separately by click on the Left or Right tab To relink the two channels drag the disconnected channel tab over the top of the selected channel Click to unlink Drag and drop to link Channels Channels 4 2 DESIGNING YOUR TARGET CURVE The target curve is the desired in room frequency response with the Dirac Series processor performing digital room correction 4 2 1 The Auto Target When first viewing the Filter Design tab an estimated target curve suitable for your speakers is shown as the red curve This calculated target curve can be restored at any time by clicking on the Auto Target button 4 Avg Spectrum before Target _ Channels IMPULSE ix E Avg Spectrum after frat KA EAN f Normalized level dB 20K Frequency Hz Note restoring the auto target will erase the current target curve If you wish to keep it you
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