owner`s manual
Contents
1. ANALOG LINE OUTPUT CHANNELS 1 8 Mic IN XLR Input O DPA 130V input optional LINE OUT XLR output LINE OUT DB25 output OG DC Power Input mip Output mni input Q C REMOTE IN and OUT m802c Rearpanel with A D Converter Diagram a Or 0 0 OUT WORD IN Digital Output Option A in cludes 2 sets of 8 channel AES3 outputs on DB25 Word Clock in and Out and 1 set of AES3 id out puts on 4 BNC connectors SMUX 1 4 AES3 OUT SMUX 5 8 e e QUT WORD IN Digital Output option B incul des 2 sets of 8 channel AES3 out puts on DB25 Word Clock in and Out and 2 8 channel ADAT Light pipe outputs m802 Power Supply Diagram K N X C Oo a GRACE DESIGN BOULDER CO USA Q LED Voltage indicators O Power switch U CAUTION ALWAYS CONNECT DC POWER CORD d O DC output J Li Na Sief front 18 18 65 48 BEFORE TURNING ON MAIN POWER AC line input o 2 O gt cop mae E 8 jik 5 panu rear Installation SYSTEM CONNECTION DIAGRAM AC Line Input 100 120 220 230 240V m802 Power Supply Unit DC Power Cord 6 5 18 18 48VDC2. m802 Preamplifier Unit Remote Control Unit Audio Signal Inputs Outputs I2C Interconnect Cord PREAMPLIFIER POWER CONNECTIONS An 8 2 8m DC power cord is supplied to connect the 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 sequencing 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 the power supply should be lo cated 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 po
3. 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 allow 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 purchase 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 p
4. dcy sets the bar graph meters to hold the highest peak level for 3 seconds Select ing hid 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 Display contrast The display contrast can be adjusted to optimize the display for various viewing angles The Display contrast settings can be adjusted 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 channel 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 s setting is changed the mic power on that channel will be turned off and must be turned on from the channel mode screen 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
5. UANG E gt GAIN EOT sa remote microphone E CO DESIGN USA rr 30 remote microphone preamplifier Preamplifier firmware version 2 2 Remote firmware version 2 0 owner s manual Manual RevG all contents Grace Design Lunatec LLC Welcome Thank you for purchasing the Grace Design m802 preamplifier system With the combination of un matched sonic performance remote control capability and total reliability the m802 is the ultimate state of the art microphone preamplifier solution We have designed the m802 to be as easy and intuitive to use as possible However we strongly recom mend 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 B Overview Front Panel Diagram 5 m802 RCU Diagram 6 m802 Rearpanel Diagram 6 m802 Rearpanel with A D Converter Diagram 7 m802 Power Supply Diagram 2 Installation 8 Preamplifier Operation Modes 11 A D Converter Sensitivity Calibration 16 Operation within Pro Tools 18 Remote Control Unit Operation 19 Cable Diagrams 22 Specifications 23 Cleaning and Maintenance 24 Warranty Informa
6. clip the preamplifier on transient program mate rial 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 information about your peak levels and headroom status than a typical log scale meter 11 12 CHANNEL SELECT MODE A D CONVERTER ON When the optional A D convert er is installed and enabled the DECA ERA AA AKA m802 Channel Select Mode pro vides additional A D converter related features and display in formation Control of channel parameters Gain Mic Power and Phase Reverse is achieved using the same method previ figure 4 channel mode A D converter on ously described Once the A D converter is enabled the Channel Select screen on the m802 will show information regarding the cur rent A D converter configuration Beginning at the bottom left and moving across to the right the following information is displayed Current 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 a
7. 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 figure 6 lockout mode MIDI CONTROL 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 Digidesign pre microphone preamplifier In Pro Tools the mic pre controls 15 16 will control the m802 as if it were a Digidesign 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 mes sage to all preamplifiers that are declared in the pro tools setups 5 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 controlle
8. ribbon mode is active 1 The gain is increased by 10dB 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 preamp and minimizing components in the signal path NOTE This bypass function engages only after the decoupling caps have discharged to a low voltage level Thus ifphantom power was previously on the bypassing will not be instantaneous It should also be noted that no ribbon microphone 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 con nector 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 EE GLEE Boe EATE GL ap Gde Saue 2860p Log to eight adjacent channels to Dr our Mode Active j 25m SelB sl j 25 be grouped together for gain ugu P0 ygu PD 9 DER Hir pi change operations which can Rew A Feu j la i i 10 be very convenient when using ald al at stereo pairs or groups of micro WIR 9 35 phones on one instrument To enter group mode push the G
9. 25 pin provides 8 stereo AES outputs which can be configured for single or dual wire operation In single wire operation AES outputs 1 4 are copied by AES outputs 5 8 providing two sets of 8 channel digital outputs In dual wire mode AES outputs 1 4 carry audio channels 1 4 and AES outputs 5 8 carry audio channels 5 8 Please see the digital output table on page 20 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 enabled 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 48kHz 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 s
10. 32 RX GND 3 NC 3 RS232 TX 8 NC 4 NC 4 RS232 RX 9 5V 5 GND 5 GND 1 PCDATA 6 NC 2 PC CLOCK 7 NC 3 RS232 TX 8 7 5VDCIN 4 RS232 RX 9 NC 5 GND 25 Pin D sub Output Connector Analog pinout AES 3 digital pinout ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 AES5 AES6 AES7 AES8 AES1 AES2 AES3 AES4 Tv GCHGCHGCHGCHGCHGCHGCH GCH GCHGCHGCHGCHGCHGCHGCHEGCH H HOT C COLD G GROUND H HOT C COLD G GROUND N HOT da DD J_sHiecn OY SHIELD Specifications PREAMPLIFIER SPECIFICATIONS FREQUENCY RESPONSE 40 5dB gain 0 2dB 50Q source 15Hz 300KHz 40 5dB gain 3dB 50Q source 4 5Hz 1 0MHz THD N 19 6dB gain 20dBu out 1kHz lt 0007 40 5dB gain 20dBu out 1kHz lt 0010 60 0dB gain 20dBu out 1kHz lt 0050 INTERMODULATION DISTORTION 40dB gain 20dBu out SMPTE DIN 1 1 SOHz 7kHz lt 0015 SMPTE DIN 4 1 SOHz 7kHz lt 0040 NOISE REFERRED TO INPUT 60dB gain 50Q source 129dB 60dB gain 1500 source 127dB 60dB gain 6000 source 123dB PHASE DEVIATION 100 20KHz 40 5dB gain lt 3 CROSSTALK Any Channel 40 5dB gain 1kHz 110dB CMRR 60dB gain 3 5Vcm 1KHz gt 70dB 60dB gain 3 5Vcm 10KHz gt 70dB PHANTOM POWER Voltage 48V 0 9 0 0 6 8kQresistor match tolerance 0 01 MAXIMUM OUTPUT LEVEL Balanced 27dBu Unbalanced 21dBu I
11. B 12 0 dB 21 0 dB 30 0 dB 39 0 dB 48 0dB 57 0dB 53dB 45dB 13 5dB 22 548 31 5dB 40 5dB 49 5dB 58 5dB 3 8 dB 6 0 dB 15 0 dB 24 0 dB 33 0 dB 42 2 dB 51 0dB 60 0dB 7 4dB 164dB 25 5d8 34 5dB 43 7dB 52 5dB 61 5dB 9 0 dB 17 9 dB 26 9 dB 36 0 dB 45 0 dB 54 0dB 63 0dB 0 5 dB 19 6 dB 28 6 dB 56 6dB 55 5dB figure 8 gain settings Gain Control in Ribbon mode For any channel that is in ribbon mode the MIDI gain control func tions differently 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 example when in ribbon mode a gain setting of 63dB in Pro Tools equates to an M802 gain setting of 73 0dB or similarly a Pro Tools setting of 60 0dB is actually 70 0dB on 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 com mands 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 b
12. MPEDANCE Input 43500 Output 2000 DIMENSIONS Weight 14 7lbs 6 7kg Height 2U Width 19 Depth 10 POWER CONSUMPTION 100 240VAC 50 60Hz 60 Watts max DIMENSIONS Weight 6 25lbs 2 8kg Height 1 7 Width 8 5 Depth 8 5 23 24 A D CONVERTER SPECIFICATIONS DYNAMIC RANGE 20Hz 20kHz gt 115dB A weighting gt 117dB THD N 1kHz 1dBFS 20Hz 22kHz lt 0 00026 112dB Frequency response 0 2dB 3dB 44 1kHz Fs 5Hz 21kHz 22kHz 48kHz Fs 5Hz 23kHz 24kHz 88 2kHz Fs 5Hz 41kHz 44kHz 96kHz Fs 5Hz 45kHz 48kHz 176 4kHz Fs 5Hz 54kHz 72 5kHz 192kHz Fs 5Hz 59kHz 79kHz Full scale input level 16dB or 24dB 2dB trim CMRR 60Hz gt 65dB 1kHz gt 80dB 10kHz gt 60dB IMD SMPTE 4 1 60Hz 7kHz 3dBFS lt 100dB 0 0008 Interchannel crosstalk lt 120dB GROUP DELAY 44 1 48kHz 13 Fs MAXIMUM NON HARMONIC SPURIUS TONES 1kHz 1dBFS 20Hz 22kHz lt 130dBFS Sample rates internal crystal 44 1 48 88 2 96 176 4 192 kHz EXTERNAL CLOCK LOCK RANGE Wide lock mode 40 1kHz 207kHz 8 at each sample rate s Lock mode 250ppm 350 400ppm typical INTRINSIC JITTER 200HZ 20kHz BW Wide lock mode lt 60ps RMS s Lock mode lt 40ps RMS JITTER REJECTION CORNER FREQUENCY Wide lock mode 3dB 12dB octave 800Hz s Lock mode 3dB 12dB octave 10Hz Cleaning and Maintenance
13. ROUP pushbutton The words Group Mode Active will appear just below the gain status 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 figure 5 group mode 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 counter clockwise while holding the GROUP pushbutton You will notice that the 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 in Group mode To toggle the status of Phantom power or Phase onachannel you must exit Group mode FRONT PANEL LOCKOUT MODE The front panel controls on an individual m802 can be locked kite 34548 60348150348 E 28648 1 to prevent unintended chang nttr Fact es to its settings Preamplifier settings can still be controlled from the RCU or via MIDI To ac tivate lockout mode press and hold the DATA knob for 5 sec onds When in Lockout Mode the words interface locked will appear on the LCD display see figure 6 below To
14. When selected the settings for a channel can be adjusted with the 48 PHASE or DATA controls Pushing the 48V 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 numeric 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 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 figure 3 channel mode A D converter off The bar graph meter at the right edge of each channel section is a 15 segment peak meter which indi cates preamplifier 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
15. ample rate or a Digidesign 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 input is terminated to 75 ohms within the m802 and thus should not be terminated elsewhere The clock out put 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 DATA CONNECTIONS m802 RCU Control m802 RCU to Preamplifier data connections are made with an HC serial cable This cable has a male 9 pin D sub connector at each end The data cable can be up to 1000 304 Meters in length The I2C cable is connected to the 9 pin D sub connector on the remote unit and to the I2C IN 9 pin D sub connector on the preamplifier As well the RCU is supplied with a set of adapters that allow one to use a standard microphone cable for the serial data link The microphone cable can be up to 1000 long It is not recommended to use a line in a multi channel snake that contains mic level signals for this application because the serial data activity can induce noise into adjacent low level audio signal lines However it is acceptable to include the data signal in a snake that contains only line level signals Preamplifier to Preamplifier connections are made by connecting a 9 pin I2C cable from the I2C OUT connector on one preamplifi
16. ay for return freight charges via ground service Customers outside the US must contact 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 tele phone 303 443 7454 Monday Friday 9 00am to 5 00pm MST or you can register your product on line at www gracedesign 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 Revision Page change poe indak ns PA TY PY le is updated r30vrribbon mic mode nio 03232010 eag DREES
17. ayed 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 settings click the encoder while ADC Sensitivity is highlighted Rotate the encoder clockwise to select the B calibration or counter clockwise to select the A calibra tion 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 ana log input section will reconfigure for the new sensitivity 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 18dB Headroom B 18dBu OdBFS 14dB Headroom Internal trim controls allow you to reconfigure either or both of the sensitivity levels Four standard sensitivities are supported in the m802 A D converter 18dBu OdBFS 20dBu OdBFS 22dBu OdBFS 24dBu OdBFS 14dB Headroom 16dB Headroom 18dB Hea
18. chieved 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 display a OdBFS scale instead of the stan dard 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 con verter 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 pressing 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 preset registers To select a us
19. d 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 can only be made via MIDI commands or from the RCU To exit Lockout mode send the MIDI unlock command or press and hold the data knob for 5 seconds Group mode m802 Group mode can be used when in MIDI control mode but if a grouped channel gain is changed from within Pro Tools or by a MIDI controller only that channel will change Pro Tools does however 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 sen sitivity 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 displ
20. droom 20dB Headroom nnan a Se Zen een Ze TO RECALIBRATE FOR A DIFFERENT A D SENSITIVITY DO THE FOLLOWING The procedure in this section configures the m802 software Power down the m802 Remove the 8 top cover screws using a 2 Phillips driver Lift the top cover off the unit and set it aside Enter the ADC Sensitivity Setup menu by powering up the m802 while the PEAK button is pressed Move the encoder until ADC Sensitivity is highlighted Click the encoder to edit the parameter Rotate the encoder to choose the sensitivity setting you wish to modify A or B Click the encoder once the desired setting is selected 5 Now rotate the encoder to the right column until it highlights the Sensitivity CAL setting corresponding to setting A or B you just selected 6 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 7 Rotate the encoder until DONE is highlighted Click the encoder and the preamp will reboot 8 Verify that the A D converter is turned on PY NG The procedure in this section configures the m802 hardware The following steps should be repeated for each channel 1 Set the preamp gains to 16 4dB 2 Connect a signal generator to the channel input and connect a level meter that reads dBu to the output of the channel 3 Increase the generator level until the level until the preamp outpu
21. e 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 Connec tions section 13 14 The Preamplifier ID This field allows one to select a unique identification for each preamplifier in a system The ID number also assigns channel numbers 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 the preamplifier is assigned to Note It is very important that all preamplifiers in a multiple preamplifier system have unique ID num bers However the ID numbers do not need to be contiguous For example you could have one preampli fier set to ID 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 18 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
22. eamplifier front panel interface and has a single Philips I2C 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 connects to the preamplifier via a Philips I2C serial buss which makes parallel connections 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 preamplifier For instance 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 cur rent 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 Please Note The 9pin PC is a proprietary interface It is not compatible with RS 232 RS 422 or any other 9 pin based serial protocol found in the recording studio environment The RCU can control up to 8 preamplifiers 64 channels by connecting it to one preamplifier and then connecting the remaining preamplifiers together with I2C cables in a dais
23. er 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 execute 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 when ever power is removed When power is restored the preamplifier will retrieve these settings This ensures that no settings are lost during power line interruptions 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 reverse off mic input to 48V and deletes any channel groups Pre set register 0 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 saeh nf WE E Tel en Wl kd A Li i e VE aana aas as The A D converter clock setup menu a
24. er to the I2C IN connector on another preamplifier Note In a multiple preamplifier system all preamplifiers must be powered on for the RCU to communi cate at all If one preamplifier is accidentally powered down the display on the RCU will go blank indicat ing that a preamplifier is not responding This will not affect the continued operation of the remaining preamplifiers If the un powered preamplifier can not be powered on then it must be disconnected from the data daisy chain to restore proper communication If the 12C link between the RCU and the preamplifiers is interrupted by disconnecting the data cable the RCU may freeze If this happens simply reset the RCU by removing its power momentarily If the RCU does freeze there is no effect on the continued functioning of the preamplifiers in the system MIDI Control The m802 MIDI IN connector can be connected to the MIDI output of a controller or a computer running Pro Tools Additional m802s can be connected in a daisy chain fashion by connecting the MIDI OUT from one preamplifier to MIDI IN on the next with the final preamplifier s MIDI OUT connected to the MIDI IN on the Pro Tools computer Preamplifier Operation Modes CHANNEL SELECT MODE A D CONVERTER OFF This is the default power on mode In Channel Select T lan 34548 48548 803a8 Gas 38 B48 2868 156 mode the rotary encoder is used to select one of the eight visible channels on the LCD display for adjustment
25. etween the available inputs on each channel On a standard preamp card ribbon mode is activated if LINE INPUT is selected via MIDI If an optional 130V DPA card is installed the DPA 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 us ing 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 chan nel 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 Phase Reverse 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 19 20 GROUP The GROUP button has the same function as the GROUP button on the preamplifier unit ex cept 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
26. her als 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 Digidesign PRE user guide which can be found at the following URL http akmedia digidesign com support docs PRE_ Guide_v80_56123 pdf file subject 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 Digidesign Pre Since the Digidesign Pre and the m802 have differing features there will be some m802 functions that are not available when in MIDI mode As well there are Digidesign 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 available 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 un changed 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 2 0 d
27. light 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 pressing 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 chan nels one preamplifier in the system There will be a small dot above the channel numbers where there is an actual preamplifier in the system The picture below shows the meter mode for a system with 2 preamplifiers 16 channels Pressing and holding the VIEW button for 1 second will return the LCD dis play to Channel mode When the optional A D converter is active on preamp in the system it will be reflected on the Meter Mode screen Underneath the corresponding channels A D On dBFS Scale will be displayed This indi cates 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 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 I2C serial interface to
28. llows 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 con verter is disabled and all clocks are turned off When using an external 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 or 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 pro fessional 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 wir
29. m 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 RCU The RCU 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 21 Cable Diagrams 12C over CAT5 cable diagram Digital Output Configuration BLUE CHANNEL CHANNEL WHITE BLUE SINGLE WIRE DUAL WIRE eege UA aee See mem REEN N WHITE GREEN WIRE IS CAT5E DB9 MALE When using I2C interface cables over 500 152 meters with fewer than 4 preamplifiers care must be taken to terminate the UC bus at the preamplifier end to a resistance between 330 and 900 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 Of Preamps R1 R2 value 5 820 Ohms 1 1K Ohms 2 2K Ohms DRAIN SHIELD WIRE IS BELDEN 1883A 24 AWG TWISTED PAIR WITH FOIL SHIELD DB9 MALE m802 Preamplifier DB9 pinout m802 Preamplifier DB9 pinout UPPER CONNECTOR LOWER CONNECTOR 1 PCDATA 1 PCDATA 6 NC 2 PC CLOCK 2 PC CLOCK 7 RS2
30. 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 imme diately The channel 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 preamplifier 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 pre amplifier system 16 chan nels the RCU will show 123 4 5 6 a 31011 l2 l3 14 15 16 1 18 19 2021 22 23 24 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 Napa mekan made J the selected channel to 9 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 8 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 high
31. plied 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 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 additional set of parallel outputs is provided with a 25 pin D sub connector See the figure at the back of the manual 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 20 Note This will provide a signal of positive absolute polarity when the pre amplifier 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 preamp outputs to the A D converter is fixed Each preamp channel feeds the corresponding con verter channel 1 8 The DB
32. t is 4dBu 4 Using anon 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 below full scale For example ifyou have selected 20dBu 0dBFS 16dB Headroom for sensitivity A turn the trim A potentiometer until your digital meters read 16dBFS If you have selected 24dBu OdBFS 20dB Headroom for sensi tivity B turn the trim B potentiometer until your digital meters read 20dBFS 5 Once all channels have been recalibrated shut down the m802 and reinstall the top cover 18 NOISIG Jowo 9002 gt a N A m lt figure 7 A D trim locations Operation within Pro Tools The m802 can be controlled directly from Digidesign ProTools HD via MIDI jacks on the m802 and the Digidesign I O Using the m802 with ProTools requires some setup in ProTools and the host computer s MIDI configu ration MSS for windows AMS for MAC When connected to a ProTools system the m802 is designed to exactly emulate the Digidesign Pre This means that configuring the m802 in the I O and Perip
33. that your Grace Design m802 needs to be returned to the factory contact us for a return authorization number Overview SYSTEM COMPONENTS 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 amplifier PCBs a micro controller PCB and a front panel control interface For remote control communications the preamplifier chassis is equipped with two Philips I2C bus connectors D sub 9 pin and 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 amplifier circuits As well as the standard 48V phantom powered microphone inputs the m802 can be ordered with op tional 130V inputs for use with the DPA formerly B amp K high voltage microphones These microphones employ a high voltage transformerless impedance conversion circuit which is not subject to the limita tions of the 48V phantom powering standard However being unbalanced the DPA 130V 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 available for the m802 This converter module supports sample rates up to 192kHz at 24bit resolution The RCU features an expanded version of the pr
34. tion 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 1096 of the nominal supply voltage Pollution Degree 2 Installation Overvoltage Category Il for transient overvoltages Maximum Relative Humidity lt 80 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 7Ibs power supply unit 2 8kg 6 25lbs 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 gt gt 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 Contact Grace Design for repair and upgrade information In the event
35. 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 contains 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 control 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 pre set from the front panel of a preamplifier you are recalling settings fro
36. wer 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 100V 100V 250V T 800mA L 120V 120V 250V T 800mA L 220V 220V 250V T 500MA L 240V 230V 250V T 500MA L 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 come 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 AC wall adapter It is recommended that the I2C data connec tions be made before applying power to the RCU Simply plugging the 2 1mm barrel connector into the DC power jack turns the power on The m802 RCU 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 sup
37. y chain fashion The RCU can be located up to 1000 305 meters away from the preamplifiers Using the adapters included with the RCU standard microphone cable can be used for this interface Only one RCU can be connected to a system at any time The m802 can also be controlled via MIDI When the m802 sees any activity on its MIDI input port it automatically switches into MIDI control mode In this mode the m802 will emulate a Digidesign 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 DATA push Q 48 Volt phantom power pushbutton O phase reverse pushbutton GROUP pushbutton O PEAK indicator reset pushbutton 6 SETUP select pushbutton 6 DATA encoder with pushbutton O LCD display 64x240 pixels m802 RCU Diagram remote microphone preamplifier lag 34548 48548 ep ol Aae SANE 2368 15648 Q 48 Volt phantom power pushbutton phase reverse pushbutton GROUP pushbutton O VIEW peak indicator reset pushbutton Q SETUP select pushbutton m802 Rearpanel Diagram ERR GAIN EDIT Q 7 segment LED display DATA encoder with pushbutton Page Up Down pushbuttons D Channel Select pushbuttons LCD display 64x240 pixels
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