Grace m802 Owner'S Manual Download Page 1

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Owner’s Manual

remote microphone preamplifier

Preamplifier firmware version

3.0

Remote firmware version

3.1

Manual Revision

all contents © Grace Design/ Lunatec LLC

Summary of Contents for m802

Page 1: ...Owner s Manual remote microphone preamplifier Preamplifier firmware version 3 0 Remote firmware version 3 1 Manual Revision H all contents Grace Design Lunatec LLC ...

Page 2: ... 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 m802 Power Supply Diag...

Page 3: ...Equipment suitable for continuous operation Weight preamplifier 6 7kg 14 7lbs 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 ...

Page 4: ... The RCU connects to the preamplifier via an I2C 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 preamplifier For example when you tell a preamplifier to change...

Page 5: ... PEAK indicator reset pushbutton m802 RCU Diagram 48V GROUP VIEW SETUP GAIN EDIT CHANNEL SELECT remote microphone preamplifier push 1 2 3 4 5 6 7 9 8 10 8 1 48 Volt phantom power pushbutton 2 Ø phase reverse pushbutton 3 GROUP pushbutton 4 VIEW peak indicator reset pushbutton 5 SETUP select pushbutton 6 7 segment LED display 7 DATA encoder with pushbutton 8 Page Up Down pushbuttons 9 Channel Selec...

Page 6: ...put 6 XLR Mic Input m802 Rearpanel with A D Converter Diagram MIC IN GRACE DESIGN USA LINE OUT 1 2 3 4 5 6 7 8 CONTROL DC IN OUT IN MIDI MIC IN LINE OUT I2C RS485 RS422 1 2 3 4 5 6 7 8 LINE OUT LINE OUT 1 2 3 4 5 6 7 8 I2C RS485 RS422 Digital Output option B inculdes 2 sets of 8 channel AES3 outputs on DB25 Word Clock in and Out and 2 8 channel ADAT Lightpipe outputs Digital Output Option A includ...

Page 7: ...C 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...

Page 8: ...0V 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 ad ditional set of parallel outputs is provided with a 25 pin D sub connect...

Page 9: ...pt 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 input 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 so...

Page 10: ...ly plug The RCU screen will display the current function of the serial port 6 Release the three buttons rotate the GAIN EDIT knob to select the serial mode then push the GAIN EDIT knob to save the setting The advantages of using the m802 in RS 485 RS 422 mode 1 Ground isolation The RS 485 RS 422 ports on the m802 preamplifiers are ground isolated This en sures that there are not ground loops creat...

Page 11: ...le 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...

Page 12: ... 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 store preamp preset 01 store go The settings for each channel in a preamplifier can be manually stored for later recall in on...

Page 13: ... 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 ID id 1 peak hld co...

Page 14: ...re amp 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 if phantom power was previ ouslyon thebypassingwillnotbeinstantaneous Itshouldalsobenotedthatnoribbonmicrophone should be connected until these caps have completely discharged If an optional 130V DPA preamplifier card is installed the inpu...

Page 15: ...ere 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 sw...

Page 16: ...tual 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 calibr...

Page 17: ... 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 output is 4dBu 4 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...

Page 18: ...DI 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 7 1dB 2 0 dB 12 0 dB 21 0 dB 30 0 dB 39 0 dB 48 0 dB 57 0 dB 5 3 dB 4 5 dB 13 5 dB 22 5 dB 31 5 dB 40 5 dB 49...

Page 19: ...r the currently selected channel will illuminate green Page Up Down The page Up button is labelled and the page Down button is labelled 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 ...

Page 20: ...nverter in the system can have its own independent configuration Like all other adjustable param eters 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 dis...

Page 21: ...re is Belden 1883A 24 AWG single twisted pair with foil shield or equivalent Wire is Belden 1883A 24 AWG single twisted pair with foil shield or equivalent I2C Preamplifier Preamplifier RCU Cable Diagram CONNECTOR 1 CONNECTOR 2 pin 5 SHIELD GND PAIR 1 BLACK pin 5 pin 1 pin 1 pin 2 pin 2 PAIR 1 RED 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 CONNECTOR 2 DB9 male CONNECTOR 1 DB9 male Shorting Plug 1 2 3 4 5...

Page 22: ...5 Rs422 TX RS422 RX Chassis GND GND RS485 RS422 TX RS485 RS422 GND GND ISO RS422 RX 5V Power Supply Output relative to Chassis GND I C I C I C 2 2 2 1 2 3 4 5 6 7 8 9 m802 DB9 pinout RCU 1 2 3 4 5 6 7 8 9 Data Clock RS485 422 TX RS422 RX GND Rs485 422 TX GND 8V Power Supply Input RS422 RX I C I C 2 2 RS485 DB9 connector Pinouts m802 serial s P802490 and above H HOT C COLD G GROUND 10 11 12 13 14 1...

Page 23: ... gain 50Ω source 129dB 60dB gain 150Ω source 127dB 60dB gain 600Ω source 123dB PHASE DEVIATION 100 20KHz 40 5dB gain 3 CROSSTALK Any Channel 40 5dB gain 1kHz 110dB CMRR 60dB gain 3 5Vcm 1KHz 70dB 60dB gain 3 5Vcm 10KHz 70dB PHANTOM POWER Voltage 48V 0 9 0 0 6 8kΩresistor match tolerance 0 01 MAXIMUM OUTPUT LEVEL Balanced 27dBu Unbalanced 21dBu IMPEDANCE Input 4350Ω Output 200Ω DIMENSIONS Weight 14...

Page 24: ... CMRR 60Hz 65dB 1kHz 80dB 10kHz 60dB IMD SMPTE 4 1 60Hz 7kHz 3dBFS 100dB 0 0008 Interchannel crosstalk 120dB Group Delay 44 1 48kHz 13 Fs Maximum Non Harmonic Spurius Tones 1kHz 1dBFS 20Hz 22kHz 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 Intrisic Jitter 200HZ...

Page 25: ...f 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 pay 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 warran...

Page 26: ... A F all no revition history available edg G 15 updated 130V ribbon mic mode info 03 23 2010 edg G 18 19 updated ProTools operation information 03 23 2010 edg H all added RS 485 RS 422 control software added 6 15 2011 edg Manual Revisions ...

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