Owner`s manual Rev I
Contents
1. SPE 25548 Tia figure 4 channel mode A D converter When the optional A D converter is installed and enabled the m802 Channel Select Mode provides additional A D converter related features and display information Control of channel parameters Gain Mic Power and 11 12 Phase Reverse is achieved using the same method previously described Once the A D converter is enabled the Channel Select screen on the m802 will show information regarding the current A D converter configura tion Beginning at the bottom left and moving across to the right the following information is displayed Cur rent sample rate the A D converter clocksource professional consumer data format the AES3 transmission format and the clock status The clock status window can display the following status messages Crystal m802 ADC is running on the internal crystal oscillator Locked The first stage wide lock range PLL is locked to the incoming clock signal but s Lock has not been achieved S Lock The s Lock crystal based PLL has locked to the incoming clock signal This assures the absolute highest rejection of incoming clock jitter Invalid Clock The message flashes to indicate that the first stage PLL is not able to lock to the incom ing clock signal This is usually indicates that the AdcFs setting does not match the incoming clock rate The A D converter also configures the m802 level meters to displa2. I2C mode control signal can be sent up to 1000 feet in RS 485 RS 422 over 3000 feet Using the adapters included with the RCU standard microphone cable can be used for this interface except for RS 422 connections Only one RCU can be connected to a system at any time m802 can also be controlled via MIDI When the m802 sees any activity on its MIDI input port it automati cally switches into MIDI control mode In this mode the m802 will emulate a AVID PRE microphone preamplifier After a period of 16 seconds with no activity on the MIDI input port the m802 will automatically revert back to its normal control mode See the MIDI Control section of this manual for more details on the MIDI control mode Front Panel Diagram a 1 2 3 4 5 6 7 1 48 Volt phantom power pushbutton 5 DATA encoder with pushbutton 2 GROUP pushbutton 6 SETUP select pushbutton 3 phase reverse pushbutton 7 PEAK indicator reset pushbutton 4 LCD display 64x240 pixels m802 RCU Diagram gh E 10 20 35 9 8 8 1 2 3 4 5 6 7 1 48 Volt phantom power pushbutton 6 7 segment LED display 2 0 phase reverse pushbutton 7 DATA encoder with pushbutton 3 GROUP pushbutton 8 Up Down pushbuttons 4 VIEW peak indicator reset pushbutton 9 Channel Select pushbuttons 5 SETUP select pushbutton 10 LCD display 64x240 pixels 11802 Rearpanel Diagram MIC 5 52 1 I gt _ NIE
3. Phase Reverse 2 This button has the same function as the button on the preamplifier unit except that it lights up to indicate the phase reverse status on the currently selected channel GROUP The GROUP button has the same function as the GROUP button on the preamplifier unit except that it lights up to indicate that Group mode is active Group mode functions the same way on the RCU as it does on the preamplifier unit Note that the channel select buttons for all of the channels in a group will illuminate when their group is selected To access Group mode from Meter mode it is first necessary to return to Channel mode CHANNEL SELECT The channel select buttons allow direct access to a channel without having to turn the DATA knob This can be handy when a channel is overloading and you need to access it immediately The chan nel select button for the currently selected channel will illuminate green Page Up Down The page Up button is labelled gt gt and the page Down button is labelled lt lt In a multiple pre amplifier system these buttons allow for immediate paging to the next preamplifier s setup screen Scrolling the cursor with the DATA knob will also allow for paging between preamplifiers For example in a 2 preamplifier system 16 channels the RCU will show two pages channels 1 8 and channels 9 16 With the cursor on channel 8 turning the DATA control one click clockwise will page the screen and move the selected channel to 9
4. 100 100 250 T 800mA 120V 120V 250V T 800mA 220V 220V 250V T 500mA 240V 230V 250V T 500mA 240V 240V 250V T 500mA L figure 1 fuse value table CHECK LINE VOLTAGE SETTINGS The power supply unit has been set from the factory to operate at the voltage required for your part of the world However it s important to double check this in order to ensure no damage will occur to the unit if power is applied while the setting is incorrect TURNING THE POWER ON The power switch is located on the front panel of the Power Supply Unit Switching the rocker switch to the position turns the mains power on Switching the rocker switch to the O position turns the mains power off REMOTE CONTROL UNIT POWER CONNECTION The RCU is powered with the supplied wall adapter It is recommended that the 2 RS 485 or RS 422 data connections be made before applying power to the RCU Simply plugging the 2 1mm barrel connector into the DC power jack turns the power on m802 is rated for 6 0 7 5V 0 5A DC is in the center and is on the outside sleeve AUDIO CONNECTIONS Standard microphone input connections are made via female XLR connectors with pin 2 positive pin 3 negative and pin 1 ground 48V phantom power is supplied on pins 2 and 3 DPA 130V microphone connections are made via the female 4 pin XLR connectors with audio on pin 4 130V on pin 3 and ground on pin 1 On standard m802 preamp
5. View Pressing the VIEW button momentarily clears the peak indicators on the bar graph displays Pressing and releasing the VIEW button will also clear any digital over indicators Pressing and holding the VIEW button enters and exits Meter mode See figure 9 below Meter Mode Pressing and holding the VIEW button for 1 second switches the LCD display into Meter mode In Meter mode the LCD displays bar graph level meters for up to 24 channels at a time The DATA control is used to highlight an individual channel The display will page from channels 1 24 to channels 25 48 and then to channels 49 64 as the page up or page down buttons are pressed or the DATA control is rotated The Channel Select buttons will illuminate with the selected channel as well Pushing the DATA knob or press ing the illuminated Channel Select button when a given channel is highlighted zooms to the Channel mode for channel parameter adjustment In meter mode there are always 64 channels of meters available to view even if there are only 8 channels one preamplifier in the system There will be a small dot above the channel numbers where there is an actual pre amplifier in the system The picture below shows the meter mode for a system with 2 preamplifiers 16 chan nels Pressing and holding the VIEW button for 1 second will return the LCD display to Channel mode 19 20 When the optional A D converter is active preamp the system it will be reflected
6. the Meter Mode screen Underneath the corresponding channels A D On dBFS Scale will be displayed This indicates that the scale is no longer in dBu but rather dBFS just like Gain mode Any digital overs that occur in the A D converter will be latched and displayed as small ovals above each meter 3 5 B B BID II I2 13 14 I5 IB 1 18 IH figure 9 meter mode Note that when in Meter mode the RCU will not indicate the status of mic power phase rev or gain of the selected channel because the RCU is using the full bandwidth of the 12 serial interface to transmit level data from multiple preamplifiers simultaneously SETUP On the RCU setup mode is accessed by pushing the SETUP pushbutton Setup mode on the RCU con tains the same menus as Setup mode on the preamplifier with a few important distinctions A D converter Setup For any preamp with the optional A D converter module installed the m802 RCU gives the user access to all of the converter setup parameters except clock output selection These controls do not function in a global manner like the preset operations but rather affect the preamp that is currently active Thus each A D converter in the system can have its own independent configuration Like all other adjustable parameters the remote control sends A D converter setup commands and the preamp acts on it This results in a slight latency when adjusting A D converter parameters from the remote c
7. This converter module supports sample rates up to 192kHz at 24bit resolution The RCU features an expanded version of the preamplifier front panel interface and has a single 12 RS 485 RS 422 bus connector as well as a DC power Jack REMOTE CONTROL OPTIONS The m802 preamplifier can be controlled by the RCU via MIDI or directly from its front panel The RCU con nects to the preamplifier via an 2 RS 485 or RS 422 signal which makes a parallel connection between all of the devices in the system In an m802 system the RCU is the master and all of the preamplifiers are slaves The data on the display of the RCU is echoed back from the preamplifier so it shows the actual status of the pre amplifier For example when you tell a preamplifier to change its gain at the RCU the RCU will send the gain change command to the preamplifier and then ask the preamplifier what its current gain setting is The RCU will then update its own display to reflect the change This gives the user absolute confidence that what is visible on the display is exactly what is happening at the preamplifier If the RCU is disconnected from the preamplifier s the data fields in the display will go blank but the preamplifiers will continue to operate normally The RCU can control up to 8 preamplifiers 64 channels by connecting it to one preamplifier and then connect ing the remaining preamplifiers together with IC RS 485 RS 422 cables a daisy chain fashion
8. 00pm MST or you can register your product online at www gracede sign com This warranty is in lieu of all other warranties whether written expressed or implied INCLUDING ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE In no event will Grace Design be liable for lost profits or any other incidental consequential or Exemplary damages even if Grace Design is aware of the possibility of such damages In no event will Grace Design s liability exceed the purchase price of the product This warranty gives the customer specific legal rights The customer may also have other rights which vary from state to state Some states do not allow limitations on implied warranties or consequential damages so some of the limitations of the above may not apply to a particular customer 25 26 Manual Revisions ar a _ 3 20 2012
9. For example if you have selected 20dBu OdBFS 16dB Headroom for sensitivity A turn the trim A potentiometer until your digital meters read 16dBFS If you have selected 24dBu OdBFS 20dB for sensitivity B turn the trim B potentiometer until your digital meters read 20dBFS Once all channels have been recalibrated shut down the m802 and reinstall the top cover NOISSG 4 9002 gt 2 NO 2 T lt figure 7 A D trim locations 17 18 Operation within Pro Tools The m802 can be controlled directly from AVID ProTools HD via MIDI jacks on the m802 and the AVID 1 Using the m802 with ProTools requires some setup in ProTools and the host computer s MIDI configuration MSS for windows AMS for MAC When connected to a ProTools system the m802 is designed to exactly emu late the AVID Pre This means that configuring the m802 the I O and Peripherals settings in ProTools it is necessary to choose the exact same settings as the Digidesgn Pre For a detailed discussion of Pro Tools Pre configuration please read the AVID PRE user guide which can be found at the following URL http akmedia AVID com support docs PRE Guide v80 56123 pdf file sub ject to relocation Chapter 3 includes operating system as well as Pro Tools configuration information which will allow Pro Tools to recognize the m802 as a AVID Pre Since the AVID Pre and the m802 have differing featur
10. Tools equates to an m802 gain setting of 73 0dB or similarly a Pro Tools setting of 60 0dB is actually 70 0dB the m802 The same gain settings on the Pro Tools interface figure 8 are supported in ribbon mode Pad The m802 does not have a pad circuit so a PAD command will be ignored Input Impedance The m802 does not have adjustable input impedance so Input Impedance commands will be ignored Mute The m802 does not have a mute function so this command will be ignored Input Select The m802 does not have a line input but we have mapped the line mic MIDI command to select between the available inputs on each channel a standard preamp card ribbon mode is activated if LINE INPUT is selected via MIDI If an optional 130V DPA card is installed the 130V mic input is selected if LINE INPUT is selected via MIDI Remote Control Unit Operation The m802 Remote Control Unit RCU features the same LCD display and DATA knob found on the front panel of the preamplifier As well most of the control conventions for the preamplifier apply when using the RCU However the RCU has additional pushbuttons for direct channel select page up down and view and a 3 digit numerical display which indicates the gain level of the currently selected channel 48V This button has the same function as the 48V button on the preamplifier unit except that it lights up to indicate the microphone power status on the currently selected channel
11. 1 Specifications 23 Cleaning Maintenance 25 Warranty Information 25 Manual Revisions 26 Important Safety Information GENERAL Indoor use only Ordinary Protection This equipment should not be exposed to dripping or splashing Avoid placing objects filled with liquids such as vases or glasses on this equipment Class Equipment grounded type Electrical rating 100 120 220 240V 50 60Hz 25W Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree 2 Installation Overvoltage Category Il for transient overvoltages Maximum Relative Humidity 8096 Operation temperature range 10 C to 40 C Storage and transportation temperature range 40 C to 70 C Maximum altitude 3000m 9843 ft Equipment suitable for continuous operation Weight preamplifier 6 7kg 14 7165 power supply unit 2 8kg 6 25165 SAFETY MARKING SYMBOLS CAUTION READ ACCOMPANYING DOCUMENTS This symbol located on the equipment and in this manual refers to important in structions Read this manual thoroughly before operating this equipment WARNING ELECTRICAL SHOCK HAZARD This symbol located on the equipment and in this manual indicates the potential for electrical shock hazard 329 DC POWER OUTPUT This symbol located on the equipment and in this manual indicates a DC power output connection SERVICE INFORMATION The Grace Design m802 contains no user serviceable components Co
12. 2kHz lt 0 00026 REQUENCY RESPONSE 0 2DB 2 Fs gt 115d gt 117d N Q 22 8kHz Fs 8 2kHz Fs 6kHz Fs 76 4 2 Fs 92kHz Fs ULL SCALE INPUT LEVEL 164 or 24dB 24 trim UJ Jg 09 29 29 kHz OkHz MD SMPTE 4 1 60Hz 7kHz 3dBFS NTERCHANNEL CROSSTALK 120dB ROUP DELAY 4 1 48kHz MAXIMUM NON HARMONIC SPURIUS TONES kHz 1dBFS 20Hz 22kHz AMPLE RATES INTERNAL CRYSTAL 4 1 48 88 2 96 176 4 192 2 XTERNAL CLOCK LOCK RANGE Wide lock mode 40 1kHz 207kHz 8 at each sample rate s Lock mode 250ppm 350 400ppm typical NTRISIC JITTER 200HZ 20KHZ BW Wide lock mode s Lock mode REJECTION CORNER FREQUENCY Wide lock mode 3dB 12dB octave 800Hz s Lock mode 3dB 12dB octave 10Hz A 5 0 00 13 Fs 130dBF lt 60ps RM lt 40ps RM and Maintenance Your m802 amplifier chassis is constructed out of high quality stainless steel Under normal circum stances virtually no maintenance is required to keep the unit looking shiny and new However if your unit becomes smudged or dirty here are some cleaning tips We recommend using either Pledge furniture polish or Zep brand stainless steel cleaner available at the hardware store Apply cleaner to a clean dry lint free cloth and gently wipe all stainless surfaces taking care not to a
13. CS LS CCC UD U UU GAIN EDIT qu remote microphone mr SO 9 lt RACE DESIGN USA rr remote microphone preamplifier Owner s Manual Preamplifier firmware version 3 0 Remote firmware version 3 2 Manual Revision I all contents Grace Design Lunatec LLC Welcome Thank you for purchasing the Grace Design m802 preamplifier system With the combination of unmatched sonic performance remote control capability and total reliability the m802 is the ultimate state of the art mi crophone preamplifier solution We have designed the m802 to be as easy and intuitive to use as possible However we strongly recommend that you read this product manual thoroughly to familiarize yourself with the unique features and capabilities of the m802 Also please do not hesitate to contact us directly if you have any questions comments or concerns with your new m802 microphone preamplifier system Thanks for reading and happy recording The Grace Design Team Table of Contents Welcome 2 Important Safety Information 3 Overview 4 Front Panel Diagram 5 m802 RCU Diagram 5 m802 Rearpanel Diagram 6 m802 Rearpanel with A D Converter Diagram 6 11802 Power Supply Diagram 7 Installation 7 Control Data Connections Preamplifier Operation Modes 11 A D Converter Sensitivity Calibration 16 Operation within Pro Tools 18 Remote Control Unit Operation 19 Cable Diagrams 2
14. GUT 0 a 6 A msde 5 1 2 3 4 5 6 1 MIDI In Out 4 DB25 Line Output 2 DC Power Input 5 XLR Line Output 3 2 RS 485 5 422 remote connections 6 XLR Mic Input m802 Rearpanel with A D Converter Diagram LINE OUT LINE OUT LINE OUT GRACE DESIGN USA mso2 SMUX 1 4 2 0 m lt SMUX 5 8 Digital Output Option Digital Output option B includes 2 sets of 8 channel AES3 outputs on inculdes 2 sets of 8 channel AES3 outputs on DB25 Word Clock in and Out and 1 set of AES3 DB25 Word and Out and 2 8 channel id outputs on 4 BNC connectors ADAT Lightpipe outputs 11802 Power Supply Diagram 1 2 P Iw 1 LED Voltage indicators lt gt A CE c S m 2 Power switch O O O O CAUTION ALWAYS CONNECT DC POWER 2 A 18 Er M 48 CORD BEFORE TURNING ON MAIN POWER 3 line Input A cu font 4 DC output O gt O o O O AU rear 3 4 Installation PREAMPLIFIER POWER CONNECTIONS An 8 2 8m DC power cord is supplied to connect t
15. HGC HGCHGCHGCH GC H G C HG C HGCHGCHGCHGCHGCH GCH C COLD G GROUND Digital Output Configuration CHANNEL CHANNEL SINGLE WIRE DUAL WIRE 2 4 iud RE Specifications PREAMPLIFIER SPECIFICATIONS FREQUENCY RESPONSE 40 5dB gain 0 2dB 500 source 40 5dB gain 500 source THD N 19 6dB gain 20dBu out 1kHz 40 5dB gain 20dBu out 1kHz 60 0dB gain 20dBu out 1kHz INTERMODULATION DISTORTION 40DB GAIN 20DBU OUT SMPTE DIN 1 1 50Hz 7kHz SMPTE DIN 4 1 50Hz 7kHz NOISE REFERRED TO INPUT 60dB gain 50 source 60dB gain 150 source 60dB gain 6000 source PHASE DEVIATION 100 20KHz 40 5dB gain lt 3 CROSSTALK Any Channel 40 5dB gain 1kHz CMRR 60dB gain 3 5Vcm 1KHz 60dB gain 3 5Vcm 10KHz PHANTOM POWER Voltage 48V 6 8kOresistor match tolerance MAXIMUM OUTPUT LEVEL Balanced 15Hz 300KHz 4 5Hz 1 0MHz lt 0007 lt 0010 lt 0050 lt 0015 lt 0040 129dB 127dB 123dB 110dB gt 70dB gt 70dB 0 9 0 0 0 01 27dBu 21dBu Unbalanced IMPEDANCE Input Output DIMENSIONS Weight Height Width Depth POWER CONSUMPTION 100 240VAC 50 60Hz DIMENSIONS Weight Height Width Depth 43500 2000 14 7165 6 7kg 1 9 1 0 NO 60 Watts max 6 25165 2 8kg 17 8 5 8 5 23 24 A D CONVERTER SPECIFICATIONS YNAMIC RANGE OHz 20kHz weighting THD N kHz 1dBFS 20Hz 2
16. Ohms Each preamplifier has a termination resistance of 2 49k Ohms Build a terminator plug with resitors that will create a parallel resistance of 330 900 Ohms Plug the shorting plug into the unused I2C connector on the last preamplifier CONNECTOR 1 DB9 male CONNECTOR 2 DB9 male of Preamps R1 amp R2 value 5 21 12 over 5 Cable Diagram 7 2 1 12 12 data 2 12 clock I C clock 3 RS232 TX N 4 85232 RX 4 RS232 RX 5 GND 5 GND 1802 Preamplifier DB9 pinout m802 Preamplifier DB9 pinout 7 12232 RX GND 8 7 5V DCi 8 NC ON UPPER CONNECTOR LOWER CONNECTOR 2 1 2 data 2 14C clock 3 RS232 TX 1 C Data m802 preamplifier DB9 pinout upper and lower connector 2 Clock 3 RS485 Rs422 TX 4 RS422 RX 5 Chassis GND GND 6 RS485 RS422 TX 7 RS485 RS422 GND GND ISO 8 RS422 RX 9 5V Power Supply Output relative to Chassis GND 25 Pin D sub Output Connector Analog pinout 1 C Data 2 Clock 3 RS485 422 TX 4 5422 RX 5 GND 6 Rs485 422 TX 7 GND 11802 pinout 8 8V Power Supply Input 9 RS422 RX AES 3 digital pinout ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 AES5 56 AES7 58 51 AES2 53 54 Z N x N Z N Z N C N ODN Z N GC HG C
17. Please be careful to Rotate the GAIN EDIT knob to select the serial mode then push the GAIN EDIT knob to save the set ting use the correct wiring for your 802 system Refer to the connector pin diagrams in the cable diagrams section 22 CONTROL UNIT m802RCU remote controls with serial number R802171 and above are equipped with RS 485 RS 422 serial ports These units also contain the original 12 serial ports and are backwards compatible with previous m802 systems The m802RCU comes from the factory in RS 485 RS 422 communication mode If 12C operation is desired for controlling older m802 preamplifiers then the software must be set for 12 mode To change the communica tions mode do the following 4 With the RCU s power supply unplugged from the barell jack push and hold the first three leftmost top row buttons ch1 ch2 While holding insert the power supply plug The RCU screen will display the current function of the serial port Release the three buttons rotate the GAIN EDIT knob to select the serial mode then push the GAIN EDIT knob to save the setting IHE ADVANTAGES OF USING THE m802 IN R5 485 RS 422 MODE 1 Ground isolation The RS 485 RS 422 ports on the m802 preampliflers are ground isolated This ensures that there are not ground loops created in the control wiring of the m802 system This is especially helpful in situations where there are multiple m802 preampliflers in distr
18. after the decoupling caps have discharged to a low voltage level Thus if phantom power was pre viously on the bypassing will not be instantaneous It should also be noted that no ribbon micro phone should be connected until these caps have completely discharged If an optional 130V DPA preamplifier card is installed the input selection will choose which physical connector is routed to the preamplifier The options are 48V 3 pin XLR and 130V 4 pin XLR Note Ribbon mic mode is unavailable on any channel that has the 130V option installed GROUP MODE The Group mode allows two to eight adjacent channels to be grouped together for gain change operations which can be very convenient when using stereo pairs or groups of microphones on one instrument To enter group mode push the GROUP pushbutton The words Group Mode Active will appear just below the gain sta tus characters To define a group place the cursor on the left most channel of the channels to be grouped and turn the DATA knob clockwise while pressing the GROUP pushbutton You will notice that the vertical dividing lines between channels disappear as channels are added to a group see figure 5 below Once in Group mode gain changes are made in the same manner as in normal Channel select mode To remove a group place the cursor on the right most channel of the channels in the group and turn the DATA knob coun ter clockwise while holding the GROUP pushbutton You will notice that t
19. by pushing the DATA knob once and then turning the DATA knob until the desired contrast is achieved Pushing the DATA knob again saves the setting Back light control The LCD display back light illumination can be turned off if desired Input Select The input select page of the setup menu is used to configure the input routing and configuration for each chan nel The available options depend on the preamp s hardware configuration Turning the DATA knob selects a channel and pushing the DATA knob toggles the selected channel between the two input options Note that when a channel setting is changed the mic power on that channel will be turned off and must be turned on from the channel mode screen ABOUT RIBBON MIC MODE For the standard microphone preamp channel the available options are 48V and Rbbn which denotes ribbon mic mode Both of these modes use the 3 pin XLR microphone input and function identically except for the following features when ribbon mode is active 1 The gain is increased by 10GB effectively shifting the available gain range from 7 1dB 63 0dB to 2 9dB 73 0dB This new gain is reflected on the user interface Rbbn is also displayed on the corresponding channel s status column 2 48V Phantom Power is disabled and locked out 3 The phantom power decoupling caps are bypassed direct coupling the microphone to the pre amp and minimizing components in the signal path NOTE This bypass function engages only
20. channels two male XLR output connectors are available with pin 2 positive pin 3 negative and pin 1 ground There is one male XLR output connector available on 130V DPA cards An ad ditional set of parallel outputs is provided with a 25 pin D sub connector See CABLE DIAGRAMS p 21 NOTE this output is not available if the optional A D converter module is installed All output connectors can be used simultaneously If the output is to be used unbalanced pin 1 should be connected to signal ground and pin 2 to signal hot Due to the nature of the balanced output stage pin 3 should be left open for unbalanced operation See CABLE DIAGRAMS p 21 Note This will provide a signal of positive absolute polarity when the preamplifier is being used with a microphone which produces a positive voltage on pin 2 with positive air pressure on the front of the diaphragm While a vast majority of microphones conform to this standard a few do not Use the phase reverse switch to compensate if necessary DIGITAL AUDIO CONNECTIONS If the optional A D converter module is installed multiple digital outputs are available The routing of the pre amp outputs to the A D converter is fixed Each preamp channel feeds the corresponding converter channel 1 8 The DB25 pin provides 8 stereo AES outputs which can be configured for single or dual wire operation single wire operation AES outputs 1 4 are copied by AES outputs 5 8 providing two sets of 8 channel digi
21. control again exits the Gain Adjust mode and returns to the Channel Select mode You will notice that changes can be made from the front panel of the preamplifier or at the RCU and both units will always show updated data The bar graph meter at the right edge of each channel section is a 15 segment peak meter which indicates pre amplifier output levels from 35dBu to 25dBu Unlike the typical log scale level meter in a tape recorder the m802 meter represents level in a mostly linear dB scale This allows for a meter range of 60dB and useful peak output level information up to 4dB of the output clip point When using the peak hold feature you will notice that the peak hold indicator is a small line for all levels except 25dBu which is indicated with a square box The clipping level of the m802 is 25dBu It should be noted that the bar graph meters in the m802 have an integration time that is approximately that of the DIN 45406 PPM meter standard This means that it is possible to clip the preamplifier on transient program material without the meter indicating a full level This is unlike the typical over indicator in a digital system which responds instantaneously to an overload Note You will notice that the meter ballistics will at first seem sluggish but this arrangement actually provides more useful infor mation about your peak levels and headroom status than a typical log scale meter CHANNEL SELECT MODE A D CONVERTER ON ig ue
22. es there will be some m802 functions that are not avail able when in MIDI mode As well there are AVID Pre functions that do not exist on the m802 Following is a summary of these limitations Gain Control the m802 has a gain range of 7 to 63 5Db in 1 5db steps When in MIDI control mode the m802 switches to a gain range of 0 to 63db in 3db steps If the m802 has channels set to gain values that are not avail able in MIDI control mode and the m802 receives MIDI activity it will change these channels to the next lowest gain setting that is available in MIDI control mode If the MIDI control mode times out and the m802 returns to its normal control mode all of the channel gain settings will be unchanged The following table figure 8 shows all of the gain settings available in the m802 The shaded cells indicate the gain settings that are available in MIDI control mode 0548 10598 196dB 28648 37548 566088 55548 figure 8 gain settings Gain Control in Ribbon mode For any channel that is in ribbon mode the MIDI gain control functions differ ently If the m802 was made to follow the absolute Pro Tools gain setting the maximum available gain would only be 69dB thus limiting the ribbon mode operation In order to achieve the maximum m802 ribbon gain setting of 73 0dB the actual gain of the m802 is 10dB higher than the reflected setting in Pro Tools For ex ample when in ribbon mode gain setting of 63dB in Pro
23. he encoder until ADC Sensitivity is highlighted Click the encoder to edit the parameter Ro tate the encoder to choose the sensitivity setting you wish to modify A or B Click the encoder once the desired setting is selected Now rotate the encoder to the right column until it highlights the Sensitivity CAL setting correspond ing to setting or B you just selected Click the encoder and rotate it to choose between the four available sensitivities Once selected click the encoder again to disengage the parameter edit mode Rotate the encoder until DONE is highlighted Click the encoder and the preamp will reboot Verify that the A D converter is turned on channel Set the preamp gains to 16 4 Connect a signal generator to the channel input and connect a level meter that reads dBu to the output of the channel Increase the generator level until the level until the preamp output is 4dBu Using a non conductive tweaker tool adjust the trim control corresponding to the current channel and sensitivity range A or B Each channel is labeled on the A D converter analog input card see figure 7 below Trim A and trim B are also labeled While adjusting the trim control monitor the digital output on your recording device Turn the trim until the digital level matches the desired headroom level That is the level you will be adjusting to will be the desired headroom in decibels be low full scale
24. he power supply unit to the preamplifier unit This cord can be identified by the 8 pin circular connectors at each end Please note that the DC power cord should be connected before the AC power is turned on This prevents incorrect power se quencing which can cause damage to the audio circuits Warning A damaged DC power cord can create a shock hazard as Voltages of 66VDC 148VDC with the DPA Input option can be present Do not operate the m802 with a damaged DC power cord Replace a damaged DC power cord with a replacement from Grace Design WA084 only To avoid any interference with the low level audio circuitry we recommend to locate the power supply at least 3 1m from the preamplifier unit POWER SUPPLY UNIT CONNECTIONS A standard AC power cable is included For safety the power supply cord must be connected to a grounded outlet AC input voltage settings can be adjusted for 100V 120V 220V and 240V operation at 50 60Hz If your voltage is 230V use the 240V setting From the rear of the power supply unit open the trap door next to the IEC power inlet with a small screwdriver Carefully pull the voltage select cam straight out and then insert with the desired voltage showing Do not try to rotate the cam while it is in the power input module Replace the fuses with the proper value selected from the fuse value table below figure 1 Be sure to use a time delay type fuse with a 250V rating CAM SETTING LINE VOLTAGE FUSE VALUE
25. he vertical dividing lines between channels reappear as channels are removed from a group Note Groups are limited to adjacent channels only and groups cannot span between preamplifier units Also only gain can be adjusted when Group mode toggle the status of Phantom power Phase channel must exit Group mode FRONT PANEL LOCKOUT MODE Rte Ef 2958 15 gg dB TE dB 10 1 ET 55 T 35 figure 5 group mode front panel controls individual m802 locked to prevent unintended changes to its settings Preamplifier settings can still be controlled from the RCU or via MIDI To activate lockout mode press and hold the DATA knob for 5 seconds When in Lockout Mode the words interface locked will appear on the LCD dis play see figure 6 below To exit lockout mode press and hold the DATA knob for 5 seconds The m802 will return to normal front panel control Note that the m802 lockout mode can only be activated at the preamplifier front panel or via MIDI Lockout mode cannot be activated from the RCU MIDI CONTROL MODE tHe 169 598 dB 1 ua 8 ea figure 6 lockout mode When the m802 detects activity on its MIDI input port it will switch to MIDI Control mode In this mode the m802 will emulate the AVID pre micropho
26. hold the data knob for 5 seconds Group mode m802 Group mode can be used when MIDI control mode but if a grouped channel s gain is changed from within Pro Tools or by a MIDI controller only that channel will change Pro Tools does how ever have its own preamp channel grouping functionality A D Converter Sensitivity Calibration The m802 A D Converter AT112 Rev B and higher features two independent calibrations for input sensitivity The software interface allows the user to easily switch between these two calibration settings Each of the two sensitivity settings A and B can be configured for one of four standard sensitivities The following sections detail the operation and calibration of this feature SELECTING THE A D SENSITIVITY In order to access the A D Sensitivity Setup menu the m802 must be powered down Once off press and hold the PEAK button and turn the preamp back on After the system initializes the ADC Sensitivity Setup menu will be displayed This menu has two columns The left column is used to select the current A D sensitivity setting under the ADC Sensitivity menu item and the right column is used to select the actual sensitivities to be used in each setting In addition to showing which configuration is selected A or B the calibrated sensitivity is Shown in terms of both a maximum analog level as well as the corresponding digital headroom figure To toggle between the two available sensitivity setti
27. ibuted locations Differential signaling Since RS 485 RS 422 is based on a balanced differential signal it radiates far less noise than the older connection This means that control signals will be less likely to pollute audio signals in adjacent wiring Longer distance The RS 485 RS 422 signals can run over very long lines Control signals can be eas ily sent over 1000 meters 3937 Compatibility With RS 422 the m802 control signals can be transported over various standard data links This includes optical fiber media combiners m802 Preamplifier m802 RCU m802 Preamplifier m802 Preamplifier m802 to preamplifier control data connections 10 Preamplifier Operation Modes CHANNEL SELECT MODE A D CONVERTER OFF 14 342 4856 258 aB 1 5 figure 4 channel mode A D converter off This is the default power on mode In Channel Select mode the rotary encoder is used to select one of the eight visible channels on the LCD display for adjustment When selected the settings for a channel can be adjusted with the 48 PHASE or DATA controls Pushing the 48 or PHASE button toggles that function on or off for that channel Pushing the DATA control enters the Gain Adjust mode While in Gain Adjust mode the gain nu meric display characters at the top of the screen are highlighted and the rotary encoder adjusts the gain up or down in 1 5dB steps Pushing the DATA
28. llow the cleaning product to build up around the panel switches or knobs Warranty Information Grace Design warrants all of our products to be free of defective parts and workmanship for a period of five years This warranty period begins at the original date of purchase and is transferable to any person who may subsequently purchase the product during this time This warranty excludes the following conditions normal wear and tear misuse customer negligence accidental damage unauthorized repair or modification cosmetic damage and damage incurred during shipment During the time of this warranty Grace Design will repair or replace at its option any defective parts or repair defective workmanship without charge provided the customer has appropriate proof of pur chase and that the product has its original factory serial number Customers within the US are responsible for all inbound freight charges to Grace Design s facility while Grace Design will pay for return freight charges via ground service Customers outside the US must con tact their distributor for warranty product return details In order for Grace Design to provide efficient and timely warranty service it is important that you mail the completed warranty registration card enclosed with all of our products within 10 days of the original date of purchase You may also register your product directly with Grace Design by telephone 303 443 7454 Monday Friday 9 00am to 5
29. mbers to the preamplifier For instance ID 1 includes channels 1 8 ID 2 includes channels 9 16 and so on to ID 8 which includes channels 57 64 Pushing the DATA knob once allows the ID number field to change by rotating the DATA knob Pushing the DATA knob again saves the setting When in MIDI control mode the ID setting determines which MIDI channel to which the preamplifier is assigned Note It is very important that all preamplifiers in a multiple preamplifier system have unique ID numbers How ever the ID numbers do not need to be contiguous For example you could have one preamplifier set to ID1 and another set to ID3 The result would be that in channel mode the RCU would page from channels 1 8 to channels 17 24 In meter mode see page 19 you would see small dots over channels 1 8 and 17 24 Peak Hold This field sets the behavior of the bar graph meters Selecting off turns off the peak hold function Selecting dcy sets the bar graph meters to hold the highest peak level for 3 seconds Selecting hld stets the meters to hold the highest peak setting until the PEAK button is pressed The Peak hold settings can be adjusted by pushing the DATA knob once and then turning the DATA knob until the desired function is visible Pushing the DATA knob again saves the setting 13 14 Display contrast display contrast be adjusted to optimize the display for various viewing angles Display contrast settings can be adjusted
30. ne preamplifier In Pro Tools the mic pre controls will control the 11802 as if it were a AVID pre If there is no activity on the MIDI input port for a period of 16 seconds the m802 will revert to its normal control mode Pro tools sends a heartbeat message to all preamplifiers that are de clared in the pro tools setups peripherals menu The heartbeat signal happens every 8 seconds which will keep the m802 in MIDI mode perpetually If using a generic MIDI controller the m802 will switch to MIDI Control mode whenever it sees a command on its MIDI input port and then switch back to normal control mode after 16 seconds of no MIDI activity When in MIDI Control mode the preamplifier can still be controlled at its front panel or from the m802 RCU MIDI channel For multiple m802 preamplifiers to exist on one MIDI buss each preamplifier must be set to a unique ID number The ID setting represents the MIDI channel by which the preamplifier will be controlled An ID setting of 1 will cause the preamplifier to communicate on MIDI channel 0 An ID setting of 2 will cause the preamplifier to communicate on MIDI channel 1 and so on The maximum number of m802 preamplifiers that can exist on a single MIDI buss is 8 Lockout If the m802 receives a MIDI lockout command the front panel controls will be locked out and changes 15 only made via MIDI commands or from the exit Lockout mode send the MIDI unlock command or press and
31. ngs click the encoder while ADC Sensitivity is highlighted Rotate the encoder clockwise to select the B calibration or counter clockwise to select the A calibration Once selected click the encoder button again to exit the parameter edit mode Turn the encoder until DONE is highlighted and click the encoder The m802 will reboot and the A D converter analog input section will reconfigure for the new sen sitivity selection Once set the selected sensitivity is stored and remains active until it is changed by the user CALIBRATING THE A D SENSITIVITY The m802 ships with the following two default sensitivity calibrations A 22dBu OdBFS 184 Headroom B 18dBu OdBFS 14dB Headroom Internal trim controls allow you to reconfigure either or both of the sensitivity levels Four standard sensitivi ties are supported in the m802 A D converter 18dBu OdBFS 14dB Headroom 20dBu OdBFS 16dB Headroom 22dBu OdBFS 18dB Headroom 24dBu OdBFS 20dB Headroom RECALIBRATING FOR A DIFFERENT A D SENSITIVITY The procedure in this section configures the m802 software 1 Power down the m802 2 Remove the 8 top cover screws using 2 Phillips driver Lift the top cover off the unit and set it aside The procedure in this section configures the 110802 hardware The following steps should be repeated for each Enter the ADC Sensitivity Setup menu by powering up the m802 while the PEAK button is pressed Move t
32. nput is terminated to 75 ohms within the m802 and thus should not be terminated elsewhere The clock output connector signal can be derived from two different sources either a buffered copy of the incoming clock signal on the wordclock input connector or the internally generated WORDCLOCK Control Data Connections PREAMPLIFIER UNIT m802 preamplifiers with serial number 802490 and above are now equipped with RS 485 RS 422 serial ports These units also contain the original IC serial ports and are backwards compatible with previous m802 systems Note that IC cannot be used in the same system where RS 485 RS 422 is being used RS 485 is a bi directional serial bus that can be configured in the same manner as the original I2C bus RS 422 is not bi directional but instead requires a wire for TX and a wire RX RS 422 can be used when interfacing with equipment that requires separate RX and TX signals As well RS 422 can be readily converted to RS 232 with widely available converters The m802 firmware comes set from the factory with the RS 485 RS 422 port set for RS 485 operation If RS 422 operation is required then do the following 1 Hold the SETUP push button on the front panel while turning the power on 2 Upon releasing the SETUP the m802 screen will display the current function of the RS 485 RS 422 port 3 Note that the RS 485 RS 422 12 ports on the preamplifler use different pin configurations than the RCU
33. ntact Grace Design for repair and up grade information In the event that your Grace Design m802 needs to be returned to the factory contact us for a return authorization number Overview SYSIEM 5 The m802 system consists of an 8 channel preamplifier chassis a power supply chassis and an optional remote control unit referred to as the RCU in the rest of this manual The preamplifier chassis contains 8 audio ampli PCBs a micro controller PCB and a front panel control interface For remote control communications the preamplifler chassis 15 equipped with two D sub 9 pin connectors which carry Philips 12 and RS 485 RS 422 signals as well as MIDI IN and OUT connectors The use of an external DC power supply unit ensures that no power line interference can compromise the performance of the sensitive microphone amplifter circuits As well as the standard 48V phantom powered microphone inputs the m802 be ordered with optional 130V inputs for use with the DPA formerly B amp K high voltage microphones These microphones employ a high volt age transformerless impedance conversion circuit which is not subject to the limitations of the 48V phantom powering standard However being unbalanced the DPA 130 microphones benefit greatly from short cable runs from microphone to preamplifier Additionally an optional extremely high performance 8 channel analog to digital converter module is avail able for the m802
34. ontrol as the configuration is completed before the status is confirmed on the RCU Preset Store Note that preset store menu displays Store System Preset When you store a preset from the front panel of a preamplifier you are storing settings in that preamplifier only If you store a preset from the RCU a store command will be sent to all of the preamplifiers in the system On the RCU the menu will indicate Preset Recall Note that the preset recall menu displays Recall System Preset When you recall a preset from the front panel of a preamplifier you are recalling settings from that preamplifier only If you recall a preset from the RCU a recall command will be sent to all of the preamplifiers in the system On the RCU the recall menu will indicate It is important to understand that all of the presets are stored in the preamplifiers and not in the simply sends commands to the preamplifiers to store and recall presets Setup Mode can not be entered from Meter Mode or Group mode You must return to Channel mode before entering Setup mode Cable Diagrams RS422 RCU to Preamplifier Cable Diagram cossgeronz ws ws ome 2 DB9 male When using interface cables over 500 152 meters with fewer than 4 preamplifiers care must be taken to terminate the I4C bus at the preamplifier end to a resistance between 330 and 900
35. tal outputs In dual wire mode AES outputs 1 4 carry audio channels 1 4 and AES outputs 5 8 carry audio chan nels 5 8 Please see the digital output diagram on page 22 The A D converter module also has an additional set of outputs These can be either 4 x AES3id BNC outputs or 2 X ADAT Lightpipe outputs the configuration is determined at time of purchase The AES3id outputs each provide 2 channels of audio data in single wire mode or 1 channel of audio data in dual wire mode The ADAT lightpipe outputs provide 8 channels of audio data on each at base rate At dual rates the ADAT S MUX is en abled and channels 1 4 are available on ADAT output 1 while channels 5 8 are transmitted on ADAT output 2 Quad sample rates are not supported over the ADAT interface AES3 id output connector configuration AES3id connector Audio channels 1 wire mode Audio channels 2 wire mode ADAT output connector configuration ADAT connector Audio channels Fs 44 1 48 2 Audio channels Fs 88 2 96kHz S MUX figure 2 digital output configuration DIGITAL CLOCK CONNECTIONS The m802 features an external clock input and clock output for syncronization to external clock sources The clock input BNC connector can accept a WORDCLOCK signal running at the selected sample rate or a AVID Pro Tools LOOPSYNC signal For optimal performance when using the external clock connection the m802 must be connected directly to a 75 Ohm clock source The external clock i
36. the store function The display will briefly display Confirmed and then return to the Channel Mode Note A preamplifier will automatically store all of its current settings into a non volatile memory whenever power is removed When power is restored the preamplifier will retrieve these settings This ensures that no settings are lost during power line inter ruptions Preset Recall Registers 1 through 15 are available for user storage and recall Register number 0 cannot be over written and contains a null set up The null setup sets all channels to the lowest gain setting mic power off phase re verse off mic input to 48V and deletes any channel groups Pre set register O is helpful when setting up for a new session Recalling a preset is identical to storing a preset see Preset Store above A D converter and clock setup Only available if A D converter module is installed The A D converter clock setup menu allows the user to configure the A D converter sample rate and clock routing Use the DATA knob to scroll to the parameter you wish to modify Press and release the DATA knob to allow editing Turning the DATA knob will then scroll through the available options for each parameter Press and release the DATA knob once again to finish editing The Adcfs field sets the rate at which the A D converter will operate In the Off position the A D converter is disabled and all clocks are turned off When using an e
37. xternal clock be sure that the sample rate setting matches the frequency of the incoming clock signal The A D converter Clocksource field determines which clock is used to derive the A D sample clock WORD and LOOP are the external clock sources and INTERNAL uses the on board crystal oscillator The ClkOut field determines which clock is routed to the m802 clock output Ckln routes a buffered copy of the incoming WORDCLOCK LOOPSYNC clock to the clock output Word routes the internally generated ultra low jitter wordclock to the clock output Digital Output Format The digital output format menu allows the user to configure the data output format to indicate professional Prof or consumer Cons in the digital stream The digital O P field selects between single wire 1 wire and dual wire 2 wire operation In single wire mode the AES outputs function at the full sample rate and carry two channels of digital audio data In dual wire mode the outputs run at half the sample rate and carry one channel of digital audio data Note that if 2 wire operation is selected here and the AD sample rate is set at 44 1 or 48kHz the m802 digital outputs will revert to 1 wire operation The physical output configurations for each of these modes is discussed in the Digital Audio Connections section The Preamplifier This field allows one to select a unique identification for each preamplifier in a system The ID number also as signs channel nu
38. y a OdBFS scale instead of the standard dBu scale A D converter sensitivity is factory set so that 22dBu level at the analog line outputs results in a OdBFS level at the A D converter An A D OVER indicator is also provided on each channel Any OVER event will be latched until cleared by the user regardless of Peak Hold settings SETUP MODE The Setup mode displays a series of menus for various user setup options When the optional A D converter module is installed in the preamp there are a total of 6 setup menus and 4 if no A D converter is installed Step through the various setup screens on a preamplifier by pushing the SETUP button Once in Setup mode press ing the SETUP button will step the top line of the display through the following menus Preset Store The settings for each channel in a preamplifier can be manually stored for later recall in one of 15 user preset registers Gain 48V Phase and Group settings as well as optional A D converter settings are stored in the pre set registers To select a user preset register first push the DATA control to highlight the preset number digits Next turn the DATA control to increment the number to the desired register and then push the DATA control again To store the preset turn the DATA control until the word Store is highlighted Next push the DATA control This will highlight the word go as well At this point turning the DATA control clockwise or counter clockwise will exe cute
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