Owner`s Manual - Abbingdon Music Research
Contents
1. Sonic Characteristics of the Digital Algorithms Output Frequency 44 1 48kHz 88 2 192kHz Organic algorithm for HD recordings is Organic Organic Digital Algorithm Technology Sonic Characteristics Minimum Soft sem gotowe m exclusive to AMR MP Listen MP Listen Apodising 808 n a Balanced full body Clean sound Lively sound Slightly cold Slightly dry Traditional Traditional AMR exclusive factory recommended M Minimum Phase technology eliminates the Pre Ringing in the DAC 2 Apodising technology eliminates the Pre Ringing in the recording 3 Soft Roll Off technology reduces the Post Ringing magnitude in the DAC Most digital 21 N bbingdon PAlusic Meezearch Organic algorithm reigns supreme it deals with ALL sources of ringing MP Listen algorithm ringing in the DAC Apodising 808 only on the 44 1 48kHz CD format and does not 22 deals only with deal with post ringing HD1 Organic this algorithm is unique to AMR because it was developed as part of the HD Gemini Digital Engine With a combination of the latest digital technologies 1 Minimum Phase ii Apodising and iii Soft Roll Off in one Organic algorithm the DP 777 is uniquely able to deal with pre and post ringing in BOTH the recording and the playback DAC Please refer to the AMR White Paper in the DP 777 product section on the AMR website for a det2. of music 13 AMwbinydon PAlusic Meezearch 3 4 Display Information The front display of the DP 777 provides information about the playback status Input Sampling Output Sampling Frequenc Frequenc Volume Input Polarity The display contains a wealth of informa tion 44 1842 14dB d dz nic RE Zero Jitter Mode Indicator Algorithm The majority of the above display is self explanatory However it is worth pointing out that the display will depict two sampling frequencies the first is the input into the DP 777 which in the above example is from a CD transport hence 44 1kHz The second frequency stated is the output sampling frequency by the DP 777 which in this case is 192kHz If there is no signal lock at the input the Input Sampling Frequency will be 14 N bbingdon PAdusic Meezearch 3 5 Zero Jitter The RC 707 remote control allows the user access the quite exceptional options of the DP 777 When the Zero Jitter option set by default is active a J is displayed in the bottom left of the display Input Sampling Output Sampling Input Polarity Frequenc Frequency Volume The J indicator will flash to confirm it has intelligently tracked the new frequency Zero Jitter Mode Indicator The DP 777 s Global Master Timing GMT and Intelligent Memory System IMS work to cancel out un wanted incoming jitter from the source Before the arrival of
3. A Nbbingson V sic Peesecarch DP 777 Premier Class Digital Processor Owner s Manual Awbinydon Plusie Meezearch FCC Declaration of Conformity United States only This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation FCC WARNING Changes or modifications to this unit not expressly approved by the par ty responsible for compliance could void the user s authority to operate the equipment NOTE This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful in terference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to ra dio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be deter mined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiv
4. Please ensure that all items are present Should an item be missing please contact your AMR distributor dealer Arvbingdon PAlusic Meezearch This page has been intentionally left blank Section 2 Component Overview Awbinydon PAdusic Meezearch 2 1 DP 777 Front Panel DIGITAL PROCESSOR DP 777 1 Standby to place the DP 777 in active standby mode F2 Input to select the previous next input F3 Analogue Volume Control to increase decrease volume in 1dB steps Note at OdB or which is FULL volume the Analogue Volume Control is automatically bypassed AMwbinydon PAlusic Meezearch 2 2 DP 777 Rear Panel Digital Processor DP 777 Great Britain Digital Inputs MV 10 Always power OFF before changing an input selection Optical NOT recom mended for 176 192 kHz Direct Coupled Ana logue Volume Control Arvbingdon PAdldusic Feescarch amp R2 Input 1 2 HD Valve Digital Input Digital SPDIF BNC XLR switchable able to accept standard XLR SPDIF signal of 5Vpp OR BNC standard SPDIF signal of 500mVpp R3 Inputs 3 amp 4 Digital SPDIF Coax amp Optical auto detect standard coaxial RCA standard SPDIF signal of 500mVpp OR Optical standard SPDIF signal Note for the Optical connection due to bandwidth limitations we do not recommend
5. ailed outline AMR s Organic digital algorithm produces the most life like and analogue reproduction of high definition music HD2 MP Listen this algorithm with the Minimum Phase and Soft Roll Off algorithms address only pre and post ringing respectively in the DAC It does not address ringing in the recording process The sonic character istic is respectable but with some recordings it may sound somewhat cold dry uninviting and lacking the final special ingredient to make it as spellbinding as the Organic digital algorithm HD3 Apodising 808 this algorithm is commonly referred to as Apodising It also encapsulates the Minimum Phase technology meaning it addresses pre ringing in the recording and the DAC The sound is lively but with some recordings it may sound artificially thin lacking in body and heft Note this filter is only available to the 44 1 48kHz CD format With such recordings the 16 Bit Classic DAC set to Bit Perfect I or II provides a much more natural and ultimately musically satisfying performance HD4 Traditional this algorithm is the most common as it is the textbook implementation With no attention paid to the common sources of ringing this yields a more sterile and clinical sound While this may satisfy some it is the least preferred Nonetheless we have included it so that DP 777 listeners may empathise why before the arrival of the DP 777 high definition music did not receive
6. d the credit it deserved Bit Perfect II is the benchmark for classic 16 Bit recordings N bbingdon Feescarch 4 4 Classic 16 Bit DAC Algorithms The DP 777 under the Classic 16 Bit DAC offers 2 user selectable methods of filtering that can be cycled through during playback by pressing the Filter button RD9 on the RC 707 The Filtering options are CD1 Bit Perfect I this mode directly takes the data extracted from the inputs and re clocked to generate the music signal Due to the complete lack of digital or analogue filtering the treble frequencies are slightly rolled off making the sound somewhat soft and laid back For the same reason the mid range and below is very natural and realistic The reproduction of impulses is completely undistorted This mode often helps to tame overly bright recordings CD2 Bit Perfect II this mode is identical to Bit Perfect I but complements this with a special analogue filter which corrects the slight roll off in the treble frequencies As a result the tonality is more accurate in the treble We therefore recommend this mode as the benchmark with which to enjoy music Notel under Bit Perfect I and Bit Perfect II modes the DP 777 is the only processor in the world that can preserve the integrity of the data all the way from the input right through to the output Hence it is truly Bit Perfect These modes were developed by and are exclusive to AMR Note2 For an Input Sampli
7. for Mac Windows setups 25 N bbingdon PAlusic Meezearch 26 This page has been intentionally left blank Section 6 Analogue Volume Control AVC Awebingdon Music Recscarch 6 1 Using the Mode Switch ALWAYS power OFF The DP 777 Digital Processor comes with a built in Direct Coupled Buffered Analogue Volume Control system R10 the DP 777 AVC before making a Mode selection This means that the DP 777 via the rear panel Mode switch R6 may be used as 1 Volume DP 777 is both a digital and analogue pre amplifier Analogue Inputs 6 amp 7 are enabled or ii Volume DP 777 is a digital pre amplifier Digital to Analogue Convertor with the AVC enabled Or Bypass is the default iii Bypass DP 777 is a standalone Digital to Analogue Convertor with the AVC bypassed tti HE Please note that if the DP 777 is set up to use the AVC it will automatically switch to Bypass mode if the volume is set to OdB or Byp ie FULL volume Using the Analogue Volume Control System easily surpasses conventional preamplifiers in transparency dynam ics and musicality ALWAYS POWER OFF the DP 777 via R10 before making a different selection on the Mode switch Should you have any questions please do not hesitate to contact your AMR distributor dealer 27 N bbingdon PAlusic Meezearch Symptom No power when the power button is set to ON No sound Remote control does not work A humming sound ca
8. ganic Upsampling Disabled Section 5 AMR Asio Driver for WINDOWS PCs must be pre installed and is found on the AMR website Computer Audio Resou rce N bbingdon Mlasic Feescarch 5 1 The Computer Software and Digital Processor It is relatively quick and easy to connect a Mac Windows personal computer to the DP 777 and commence play back However in order to achieve the very highest sound quality and to extract the maximum performance out of the DP 777 optimisation of the source is strongly recommended The pace and change of computer audio software and operating systems is unabated Therefore it is not possible to provide a detailed and up to date account on all the correct settings for optimal playback Instead the following Golden Rules should be followed when setting up a computer as a Computer Audio Source CAS Install and select the AMR ASIO driver in the playback software MS Windows only For each music file match the computer s output sampling rate i e the input sampling rate detected by the DP 777 exactly to the source i e the music file Disable all upsampling resampling options on the computer Disable all filtering options on the computer Disable all sound enhancements on the computer Keep the volume control at 100 on the computer Please refer to http www amr audio co uk for the latest AMR ASIO driver for Windows and also for the latest optimal computer audio configurations
9. he plug itself never pull the cable CAUTION ATTENTION RISK OF ELECTRIC SHOCK RISQUE DE CHOC ELECTRIQUE 00 NOT OPEN NE PAS OUVRIR On placement The DP 777 will become warm during normal operation Given this it is imperative that the installation of the DP 777 DOES NOT interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the top or bottom ventilation openings or placed in a built in installation such as a bookcase or cabinet that may impede the flow of air through its top and bottom ventilation openings Do not place the component in a location near heat sources or in a place subject to direct sunlight excessive dust or mechanical shock Do not place the component in an inclined position It is designed to be operated in a horizontal position only Do not place heavy objects on the component 4 Keep the component and compact discs away from equipment with strong magnets such as microwave ovens or large loudspeakers To prevent fire or shock hazard do not place vessels filled with liquids such as vases on the component Running In AMR estimates that the DP 777 may take between 300 500 operating hours for all of the internal components to be fully broken in Please anticipate the sonic performance of the DP 777 to settle only after it has been used for this approximate length of time Contents WARNINGS Section 1 Unpacking 1 1 Unpack
10. ing Section 2 Component Overview 2 1 DP 777 Front Panel 2 2 DP 777 Rear Panel 2 3 RC 707 Remote Control Section 3 DP 777 Operation 3 1 Power On Off 3 2 Standby 3 3 Connection and Playback 3 4 Display Information 3 5 Zero Jitter 3 6 HD Valve Digital input 3 7 Signal Polarity 3 8 Factory Reset Awbinydon PAdldusic Meezearch Arvbingdon PAlusic Meezearch Section 4 The HD Gemini Digital Engine 4 1 HD Gemini Digital Engine 32 16 Bit DAC Selection 4 2 kHz Selection 4 3 HD 32 Bit Digital Algorithms 4 4 Classic 16 Bit DAC Digital Algorithms 4 5 Default Filter Selection 4 6 AMR Optimal Auto Select Section 5 Computer Audio Resource 5 1 The Computer Software and Digital Processor Section 6 Analogue Volume Control AVC 6 1 Using the Mode Switch Appendix A Troubleshooting 25 27 28 Se cti n 1 E U n packi n g Arvbingdon Music Feesearch Please check that all contents are present Thank you for purchasing this AMR Premier Class component We hope you derive as much pleasure from using this component as we have enjoyed making it for you 1 1 Unpacking This section refers to the unpacking of the DP 777 and its subsequent setup Upon unpacking please find 1 il iv V Vi Vil Vili DP 777 Premier Class Digital Processor RC 707 Remote Control DP 777 Owner s Manual USB cable BNC gt RCA gold plated adaptor Mains power cable AMR Warranty Card AMR System Test Disk
11. ing antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Canadian Notice Avis Canadien Class B Equipment This Class B digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe B respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada This products complies with the EMC Directive 89 336 EEC the Low Voltage Directive 73 23 EEC issued by the Commission of the European Community Compliance with these directives implies conformity to the following Euro pean Norms in parentheses are the equivalent international standards and regulations EN55022 CISPR 22 Electromagnetic Interference EN55024 IEC61000 4 2 3 4 5 6 8 11 Electromagnetic Immunity o EN61000 3 2 IEC61000 3 2 Power Line Harmonics o EN61000 3 3 IEC61000 3 3 Power Line Flicker o EN60950 IEC60950 Product Safety CAUTION use of all controls adjustment or performance of proce dures other than specified herein may result in hazardous radiation ex posure The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance serv icing instructions in
12. its use for Sampling rates of 176 192 KHz Input 5 USB 24 192 Asynchronous USB Input for computer audio source R5 Analogue Inputs 6 7 enabled via R6 the DP 777 will function as a high end Direct Coupled pre amplfier R6 Mode Selection Volume Analogue Volume Control and Analogue Inputs are enabled Volume Analogue Volume Control enabled but Analogue Inputs are disabled Bypass Analogue Volume Control and Analogue Inputs are disabled R7 XLR outputs for the connection of XLR interconnects R8 RCA outputs for the connection RCA interconnects R9 Mains voltage selector to select 115v or 230v mains voltages R10 Mains Power to switch on off mains electricity to the DP 777 R11 IEC power connector for the connection of a mains power cable to the DP 777 11 AMwbinydon PAlusic Meezearch 2 3 RC 707 Remote Control S mc 707 RD1 STANDBY to place the DP 777 in active standby mode RD2 BRIGHTNESS 4 different brightness levels including display off RD3 kHz SAMPLING to cycle through the different output frequencies RD4 ZERO JITTER for the highest sound quality When engaged a small J will be displayed When the GMT Clock System dynamically tracks a change in the clock frequency the J will flash RD5 INPUT selection to select the previous next input RD6 MUTE to mute the output RD7 AMR auto selection of the optimal settings for the best sound quality Signal Polarity hold down the AMR but
13. n be heard Other problems Appendix A Troubleshooting Possible cause poor or no power plug connection at power point blown fuse at mains plug incorrect audio cable connections incorrect operation of Amplifier batteries in remote control handset have expired object obscuring remote sensor on the DP 777 no line of sight Interference from fluorescent lights loose cable connections Solution insert the power plug firmly into the AC change mains plug fuse ensure the DP 777 is correctly connected ensure input selector on the amplifier is set to DP 777 replace batteries remove any objects directly in front of the DP 777 turn off fluorescent lights or redirect the light away from the DP 777 re attach the loose cables correctly go to the Contents section and re trace the procedure or contact your nearest AMR distributor dealer Abbingdon Music Research is a subsidiary of the Abbingdon Global Group 22 Notting Hill Gate London W11 3JE United Kingdom Tel 44 0 870 420 5505 Fax 44 0 700 596 1065 28 www amr audio co uk
14. ng Frequency of 88 2kHz or above under the Classic DAC only Bit Perfect I is available This is because the special analogue filter under Bit Perfect II is not required for these higher sampling frequencies However for the best sound from sampling frequencies of 88 2kHz or higher we recommend the use of the HD DAC or just press the AMR button for the optimal playback configuration 23 Arvbingdon PAlusic Meezearch 4 5 Default Filter Selection The HD and Classic DACs each have their own set of filters In addition to pressing the Filter button RD9 to make a Filter selection it is also possible for the user to set a new default filter This is done by holding down the Filter button for 2 3 seconds The display will flash Set as Default to acknowledge the new default filter 4 6 AMR Optimal Auto Select The AMR button will At a press of the AMR button RD7 the DP 777 will intelligently select the most optimal setup for playback of intelligently select the the current source material 24 optimal setup With a 44 1 48kHz source e g CD transport files ripped from CDs the following setup will be automatically selected for optimal playback DAC Classic DAC Zero Jitter Mode Enabled Filter Bit Perfect II Upsampling Disabled With an 88 2 96 176 4 192kHz source e g HD files the following setup will be automatically selected for opti mal playback DAC HD DAC Zero Jitter Mode Enabled Filter Or
15. on RD8 on the RC 707 to alternate between the HD 32 Bit DAC or the Classic 16 Bit Multibit DAC One may disable the Auto DAC select function by holding down the button on the front panel and then power ing on the DP 777 via the mains power switch R10 To enable simply repeat the procedure Toggling between enable disable will be confirmed on the front display 4 2 kHz Selection The DP 777 under the 32 Bit HD DAC offers the following user selectable Sampling frequencies 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192KHz These are cycled through by pressing the KHz Sampling button on the RC 707 19 Arvbingdon PAlusic Meezearch Organic algorithm by AMR is the bench mark for HD record 20 ings 4 3 HD 32 Bit Digital Algorithms The DP 777 under the HD 32 Bit DAC offers the following user selectable Digital Algorithms Organic MP Listen Apodising 808 Traditional Once the Sampling mode RD3 has been selected these can be cycled through by pressing the Filter button RD9 on the RC 707 The following Digital Algorithm Filters may be selected Organic under 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192KHz MP Listen under 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192KHz Apodising 808 under 44 1kHz 48kHz Traditional under 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192KHz Note Apodising 808 is only available under 44 1kHz and 48kHz i e the CD format N bbingdon Feescarch Explanation and
16. quid has been spilled into the component C The component has been exposed to rain or liquids of any kind D The component does not appear to operate normally or exhibits a marked change in performance E The component has been dropped or the enclosure has been damaged DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF RE FER SERVICING TO QUALIFIED AMR SERVICE PERSONNEL Upon completion of any servicing or repairs request the service point s as surance that only AMR Authorised Replacement Parts with the same char acteristics as the original parts have been used and that the routine safety checks have been performed to guarantee that the component is in a safe operating condition REPLACEMENT WITH UNAUTHORIZED PARTS MAY RESULT IN FIRE ELECTRIC SHOCK OR OTHER HAZARDS AMwbinydon PAlusic Meezearch Precautions This equipment has been tested and found to comply with the limits set out in the EMC Directive using a connection cable shorter than 3 me tres On power sources The mains power cable should be routed so that it is not likely to be walked on or pinched especially near the plug or back panel receptacle The component should not be disconnected from the AC power source as long as it is connected to the wall outlet even if the component itself has been turned off If this component is not going to be used for a long time be sure to disconnect the component from the wall outlet To disconnect the AC power cable grasp t
17. t circuitry the receiver will create a glitch noise at the trigger point this noise travels back into the SPDIF cable returning to the source component It is this errant noise that is at least in part responsible for the major differences between SPDIF cables and sources in the input system of common DACs As the HD VDi isolates SPDIF receiver from the outside world HD VDi eliminates the detrimental effect caused by this noise once and for all The DP 777 s HD SPDIF inputs employ a NOS valve input circuit for everything all the way up to the 24 192 high definition standard The result is clearly visible on an oscilloscope as the SPDIF signal is restored back to its perfect wave form This input ensures the right note at the right time to give the music the life that is missing from all other DACs Therefore we recommend that for the optimal signal transfer i e highest sound quality please use Inputs 1 or 2 R1 R2 on either BNC or XLR Even with an RCA connector simply use the accompanying BNC gt RCA adaptor Inputs 3 and 4 R3 do not use the HD VDi as they are more for convenience comparative purposes The USB input 5 R4 is not required as the signal is not SPDIF 17 Arvbingdon PAlusic Meezearch To reboot the propri 18 To invert signal polarity etary software 3 7 Signal Polarity In some instances it may be more preferrable to listen to music with the signal phase inverted The DP 777 ships wi
18. th positive phase selected by default No extra indicator will be lit It is possible to press and hold the AMR button RD7 in which case a indicator will be displayed to depict that the signal polarity has been inverted 3 7 Factory Reset Whilst holding the OY and the buttons on the front panel and then powering up the DP 777 via the Mains Power Switch R10 until the countdown commences will reset the DP 777 to the default factory settings Section 4 HD Gemini Digital Engine has auto DAC selection HD DAC a total of 4 Digital Algorithms The HD Gemini Digital Engine Arbbingcdon Music Recacarch At the core of the DP 777 Digital Processor is the Gemini Digital Engine which has not one but two high end DACs Each have been hand selected by AMR as the most musical This section provides an overview of the different DAC Sampling Algorithm Filter modes available so that the original signal can be kept in its native format for the maximum musical enjoyment Or if listener so chooses he she may select playback using an alterna tive combination 4 1 HD Gemini Digital Engine 32 16 Bit DAC Selection The DP 777 will intelligently select the optimal DAC for playback of different source files The 32 Bit HD DAC will be selected if the source file is 88 2kHz or higher The Classic 16 Bit DAC will be selected if the source file is 44 1 or 48kHz The DP 777 s HD Gemini Digital Engine allows the user to use the HD butt
19. the DP 777 the issue of solving jitter introduced via SPDIF using a Phase Locked Loop PLL Clock recovery was seen as sufficient However this analogue solution to a digital problem is woefully inadequate 15 N bbingdon PAlusic Meezearch GMT is the world s first selecting from 28 million different frequencies GMT IMS system may be switched off for comparison purposes SPDIF is an analogue transmission system 16 The Zero Jitter mode utilises the original innovative GMT IMS to totally eliminate jitter coming from the source AMR s GMT clock system intelligently actualises over 28 million different real time clock frequencies to exactly match the dynamic input clock down to 0 001Hz i e 0 04ppm accuracy of the source With the new and com pletely jitter free clock coupled to the Intelligent Memory System IMS the GMT IMS system locks out source jitter once and for all The GMT System is not a secondary PLL as used in some cases and some DACS since the late 1990 s but an entirely new concept GMT instead is a system that will completely block jitter and only react to compensate any slow drift in the clock source or to adapt to a change in the sample rate The GMT Zero Jitter mode is available for all digital inputs including the USB input and is the new clock standard reference for the digital audio world For comparison purposes such as to audition against another DAC the user may press the Zero Jitter button RD4
20. the literature accompanying this component This component weighs over 10 kilograms Do not place this component on an unstable cart stand tripod bracket or table as the component may fall causing serious injury to a child or adult and serious damage to the unit An appliance and cart combination should be moved with care Quick stops excessive force and uneven surfaces may cause the com ponent and cart combination to overturn Any mounting of the device on a wall or ceiling should follow the manu facturer s instructions and should use a mounting accessory recommend ed by the manufacturer Read and follow all the safety and operating instructions before con necting or using this component Awbinydon PAdusic Meezearch All warnings on the component and in its operating instructions should be adhered to Retain this Owner s Manual for future reference Do not use this unit near water for example near a bath tub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool Unplug the component from the wall outlet before cleaning Never use ben zine thinner or other solvents for cleaning use only a soft dampcloth Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through any openings This component should be serviced only by qualified AMR service personnel when A The power cable or the power input socket has been damaged B Objects have fallen or li
21. to switch off the GMT IMS In which case the display will show Normal for 1 2 seconds and the J will no longer be present 3 6 HD Valve Digital input The Compact Disk standard was never conceived with the notion of distinctly separate transport and DAC sections but once this became so SPDIF was adopted as the method to link the two together However SPDIF is an ana logue transmission system that uses what was originally a video signal format to transmit a digital system Clearly this is not an elegant solution as the SPDIF clock and signal are transmitted together as if the red blue and green signals for a television were cobbled into a single run and HD VDi an analogue solution is a world s first HD VDi is on Inputs 1 and 2 N bbingdon Feescarch In the DP 777 to overcome this set of essentially analogue problems we devised a completely analogue solution AMR s proprietary Valve Digital input technology VDi is a world s first it is the use of the 6N11 high speed valve operating into the 100MHz region in a zero feedback circuit derived from military radar technology to re establish the clean waveform of the original incoming signal from the two HD SPDIF Inputs Firstly this ensures that even if the input SPDIF signal has an incorrect output level or poor waveform the SPDIF input receiver will have a clean and perfect SPDIF signal to lock onto Secondly as all SPDIF receivers use Schmitt Trigger inpu
22. ton for 2 3 seconds to change the signal polarity RD8 HD Dual DAC selection to select HD DAC best with 24 88 2kHz 192kHz recordings or Classic DAC best with 16 44 1 48kHz recordings RD9 FILTER to select HD DAC Organic MP Listen Apodising 808 Traditional Classic DAC Bit Perfect I or Bit Perfect II RD10 VOLUME Up Down controls the analogue volume control Auto bypass at full volume OdB 12 Section 3 Once powered OFF always wait 30 seconds before switching on again Standby will main tain power to the non valve circuitry D P 777 O pe rat O n Awbinydon Plusie Feescarch This section will focus on optimising the DP 777 but please also refer to Section 5 for optimisation of the Compu ter Audio Source CAS 3 1 Power On Off Use the POWER rocker switch R10 at the rear of the DP 777 to switch mains power ON OFF Always wait at least 30 seconds before switching on again This is to enable the circuits in the DP 777 to shut down properly The display will light up to indicate the unit is switched on and ready for use This should take just under 1 minute as the DP 777 is warming up 3 2 Standby After start up pressing the STANDBY button on either the front panel F1 or the RC 707 RD1 will place the DP 777 in STANDBY mode 3 3 Connection and Playback Once the CAS CD Transport has been connected to the DP 777 via any one of the Digital Inputs 1 5 the DP 777 is ready for the playback
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