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Grace Design m904 Stereo Monitor Controller

Item #: 
12747416262217612
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The Grace Designs M904 Stereo Monitor Controller combines multiple balanced and unbalanced analog and digital inputs with precision level controls for two pairs of studio monitors and dual headphone o... Click To Read More About This Product

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Overview

The Grace Designs M904 Stereo Monitor Controller combines multiple balanced and unbalanced analog and digital inputs with precision level controls for two pairs of studio monitors and dual headphone outs. s-Lock phase lock loop word clock regeneration for ultralow jitter and rock solid digital stability. Rackmount. Software updates with a host of new features are now available from the Grace Design website for the m904. Downloading these requires a special cable which, if you do not have, is available free of charge from Grace Design by contacting their Boulder office. If you do not have internet access, the downloads will be provided to you on CD, also free of charge.

FEATURES

Multiple stereo analog inputs
24-bit/192kHz digital stereo inputs ” AES3, S/PDIF, ADAT, and TOSLINK
s-Lock phase lock loop word clock regeneration for ultralow jitter and rock solid digital stability
Precision main and headphone level controls with a 100dB range in 0.5 dB steps
All controls on front panel with an optional m906 style remote control unit available
Multiple speaker set selection
High current audiophile headphone amplifier built in with two outputs on front panel
Complete system level calibration (inputs, outputs, inter-channel balance, dim)
Balanced talkback microphone input and activation switch with additional external foot switch control jack
Fixed level stereo DAC output for direct digital transfers
SPECIFICATIONS
ANALOG INPUT 

THD+N @ 0dB gain, 1kHz
+20dBu out
<0.001% (0.00075% typical)
+10dBu out
<0.003% (0.001% typical)
0dBu out
<0.009% (0.005% typical)
 

Intermodulation Distortion SMTPE/DIN 4:1 50Hz, 7kHz
@+20dBu out
<0.002% (0.0015% typical)
@ 0dBu out
<0.008% (0.006% typical)
 

Frequency Response
+/-3dB
3Hz - 250Khz
 

Dynamic Range
20-22kHz bandwidth
112dB
20-22kHz bandwidth and A weighting filter
115dB
 
Output Noise
20-22kHz bandwidth, -20dB gain
 
High gain mode
-89dBu
Low gain mode
-98dBu
20-22kHz bandwidth and A weighting filter, -20dB gain
 
High gain mode
-91dBu
Low gain mode
-99dBu
 

Phase Deviation
20Hz to 20kHz
< 4
10Hz to 100kHz
< 15
 

Crosstalk any channel
100Hz
< 100dB
1kHz
< 100dB
20kHz
< 85dB
 

Balanced Input CMRR
60Hz
> 65dB
1kHz
>65dB
10kHz
>60dB
 

Gain Range
Low gain mode (0.5dB steps)
-105.5dB to +20dB
High gain mode (0.5dB steps)
-95.5dB to +30dB
 

Channel Tracking Accuracy
Any channel
+/-0.05dB
 

Maximum Output Level
Low gain mode (balanced)
+15dBu
High gain mode (balanced)
+27dBu
 

Maximum Input Level
Balanced inputs
+30dBu
Unbalanced inputs
+20dBu
 

Impedances
Balanced inputs
30k Ohms
Unbalanced inputs
50k Ohms
Balanced outputs
300 Ohms
Minimum load impedance
300 Ohms
 
DIGITAL TO ANALOG CONVERTER FIXED OUTPUTS

Output Levels
 
User selectable (0dBFS)
+16dBu / +24dBu
Fixed output trim range (0.5dB steps)
-95.5dB to +30dB
 

THD+N
1kHz, -1dBFS, 20-22kHz bandwidth (44.1kHz)
0.0015%
 

Dynamic Range
20-22kHz bandwidth
>111dB
 

Input Lock Range
AES3/SPDIF
32kHz to 192kHz
TOSLINK
32kHz to 96kHz
ADAT LIGHTPIPE
30kHz 55kHz
 

s-Lock Sample Clock Intrinsic Jitter
20-22kHz bandwidth
<25ps
 

s-Lock Sample Clock Jitter Rejection
1kHz sine jitter
-40dB
 

s-Lock Supported Sample Rates
AES3, SPDIF
44.1, 48, 88.2, 96, 176.4, 192kHz
TOSLINK
44.1, 48, 88.2, 96kHz
ADAT LIGHTPIPE
44.1, 48kHz
 

s-Lock Capture Range
44.1, 48kHz
+/- 10Hz
88.2, 96kHz
+/- 20Hz
176.4, 192kHz
+/- 40Hz
 

Word Clock / Superclock Input 
Impedance (switchable)
75 Ohms / 1M Ohms
Minimum Voltage
3V peak to peak
Maximum Voltage
5V peak to peak
Word clock frequencies supported
44.1, 48, 88.2, 96, 176.4, 192kHz
Superclock frequencies supported
11.2896MHz, 12.288MHz (256x fs)
 
POWER SUPPLY / MECHANICAL SPECS

Power consumption
40W
Input Voltage 50-60Hz
100, 120, 220, 230-240VAC
 

Dimensions
Main chassis IEC 2U
3.5" x 10.5" x 17"
Remot control unit
1.6" x 8" x 5.25"
Power supply unit
1.7" x 8.5" x 8.5"
 

Weight
Main chassis
14.1lbs / 6.4kg
Remote control unit
2.3lbs / 1kg
Power supply unit
6.5lbs / 2.9kg
Pro Coverage
MANUFACTURER'S WARRANTY
5 year parts and labor warranty. Customer must mail-in copy of warranty card.


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