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... Read More

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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
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
Warranty
MANUFACTURER'S WARRANTY
5 year parts and labor warranty. Customer must mail-in copy of warranty card.


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