Grace Design m802

Grace Design m802

8-channel Remote Microphone Pre-Amp/24 bit 192khz AD Converter Daily Rate: $250

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The core is a high fidelity 8 channel microphone preamplifier designed to be extremely transparent and musical. Then the fun begins. The m802 is fully remote controllable. With our full-featured stand alone hardware RCU, up to 64 channels (a system of 8 m802’s) can be addressed and controlled seamlessly from up to 1000’ away. All preamplifier functions, including gain, phase, 48V phantom are instantly accessible and adjustable. These settings can then all be stored into preset locations and instantly recalled.

Or, the m802 can also be controlled directly from Digidesign® ProTools|HD® systems, compatible control surfaces and many other MIDI devices. Working closely with Digidesign®, we have adapted their control spec to directly address the m802 as an integrated part of a ProTools|HD® system. Additionally, the m802 can be controlled by a wide variety of MIDI mappable devices, making it easily integrated into a wide variety of remote recording situations.

Further control options include the all new Studio Six Digital stand alone computer based (PC or Mac) MIDI control utility ' Grace Design m802 Commander' (click for complete info).

Next, consider the optional 8 channel 24bit/192kHz A/D card option. Developed as the perfect complement to the m802 mic preamplifier design, this converter card provides pristine, musical A/D conversion to rival even the finest stand alone units available. Included is our proprietary unique s-Lock™ dual stage PLL for extremely low intrinsic jitter and rock solid digital performance.

DPA® 4000 series 130V microphones are widely regarded as some of the finest reference-quality microphones available. Yet, with their unique 130V power requirement, preamplifier options for these mics are quite limited. So we have made the m802 an excellent complement for DPA® microphones by adding a 130V power option, available on a per channel pair basis. The m802 now includes ribbon mic mode, which shifts the preamplifier’s entire gain range up 10dB, while deactivating 48V phantom power, optimizing input impedance and bypassing the decoupling capacitors.

While the m802 works beautifully as a stand alone mic preamplifier, the optional Remote Control Unit (RCU) provides fantastic ergonomics and enhanced system control. This updated RCU now offers dedicated individual channel select switches and a new highly visible blue LED numeric display for channel gain settings. Both the RCU and the m802 now come with a high contrast, neutral white backlight LCD.


•    fast, musical transimpedance amplifier architecture
•    fully balanced, transformeless design
•    flexible digital metering with peak hold and resetcontrollable from Digidesign® ProTools|HD® systems and compatible
•    130V phantom power available, per channel pair, for DPA microphones
•    dual high-current outputs (XLR+D-Sub) drive long cable runs and loads down to 50 Ohms
•    fast, efficient Philips I2C serial protocol to control preamplifiers from up to 1000 feet away
•    gain range of -7dB to +63dB in 1.5 dB steps
•    new selectable ribbon mic mode
•    channel group mode (perfect for stereo pairs, subgroups)
•    RCU able to address up to 8 units (64 channels) from up to 1000 feet away
•    front panel lockout mode
•    large white backlit LCD display
•    15 User preset memory locations, for saving preamplifier settings (gain, phantom power, phase)
•    optional reference quality 24-bit/192 kHz A/D converter card
•    A/D outputs include 2x8ch AES3 on DB25, 1x8ch AES3-id on 4 BNC connectors (supports double wire mode)
•    optional ADAT Lightpipe output with SMUX for 96kHz
•    s-LockTM dual stage PLL for extremely low jitter without sample rate conversion
•    wordclock in and out



Frequency response
@ 40dB gain ± 0.2dB (50Ω source)     15Hz-300kHz
@ 40dB gain ± 3dB (50Ω source)     4.5Hz-1.0MHz

@ 19.6dB gain +20dBu out, 1kHz     <.0007%
@ 40.5dB gain +20dBu out, 1kHz     <.0010%
@ 60.0dB gain +20dBu out, 1kHz     <.0050%

Intermodulation Distortion
@ 40dB gain +20dBu out

SMPTE/DIN 1:1 (50Hz, 7kHz)     <.0015%

SMPTE/DIN 4:1 (50Hz, 7kHz)     <.0040%

Noise - Referred to Input
@ 60dB gain, 50Ω source     -129dB
@ 60dB gain, 150Ω source     -127dB
@ 60dB gain, 600Ω source     -123dB

Phase Deviation
100-20KHz @ 40.5dB gain     <3°


Any Channel @ 40.5dB gain 1kHz     -110dB

@ 60dB gain, 3.5Vcm, 1kHz     >70dB
@ 60dB gain, 3.5Vcm, 10kHz     >70dB

Maximum Output Level
Balanced     +27dBu
Unbalanced     +21dBu

Input     8100kΩ
Output     200Ω

Minimum load impedance     50Ω

Weight and Dimensions
m802 preamplifier    
12lbs (5.4kg), 2U rack mount x D10”

Remote control unit    
2.3lbs (1kg), H1.6” x W8” x D5.25”

power supply    
4lbs (1.8kg), H1.7” x W 8.5” x D8.5”

Power Consumption
100/120/230/240V~ 50-60Hz     60 Watts
A/D CONVERTER MODULE (without preamplifier)
Dynamic range
20Hz-20kHz     >115dB

“A” weighting     >117dB
1kHz, -1dBFS, 20Hz-22kHz     < 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)

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 (kHz)     44.1, 48, 88.2, 96, 176.4, 192

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     < 60ps RMS
s-Lock mode     < 40ps RMS

Jitter Rejection Corner Frequency
Wide lock mode, -3dB, 12dB/octave     800Hz
s-Lock mode, -3dB, 12dB/octave     10Hz


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