Combines multiple balanced and unbalanced analog and digital inputs with precision level controls for two pairs of studio monitors and dual headphone outs. As of 5/27/05, new software updates with a host of new features are available from 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.

Grace Design m904 Stereo Monitor Controller 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)
• ÿ
  
  Intermodulation Distortion SMTPE/DIN 4:1 50Hz, 7kHz
• @+20dBu out
• <0.002% (0.0015% typical)
• @ 0dBu out
• <0.008% (0.006% typical)
• ÿ
  
  Frequency Response
• +/-3dB
• 3Hz - 250Khz
• ÿ
  
  Dynamic Range
• 20-22kHz bandwidth
• 112dB
• 20-22kHz bandwidth and A weighting filter
• 115dB
• ÿ
• Output Noise
• 20-22kHz bandwidth, -20dB gain
• ÿ
• High gain mode
• -89dBu
• Low gain mode
• -98dBu
• 20-22kHz bandwidth and A weighting filter, -20dB gain
• ÿ
• High gain mode
• -91dBu
• Low gain mode
• -99dBu
• ÿ
  
  Phase Deviation
• 20Hz to 20kHz
• < 4ø
• 10Hz to 100kHz
• < 15ø
• ÿ
  
  Crosstalk any channel
• 100Hz
• < 100dB
• 1kHz
• < 100dB
• 20kHz
• < 85dB
• ÿ
  
  Balanced Input CMRR
• 60Hz
• > 65dB
• 1kHz
• >65dB
• 10kHz
• >60dB
• ÿ
  
  Gain Range
• Low gain mode (0.5dB steps)
• -105.5dB to +20dB
• High gain mode (0.5dB steps)
• -95.5dB to +30dB
• ÿ
  
  Channel Tracking Accuracy
• Any channel
• +/-0.05dB
• ÿ
  
  Maximum Output Level
• Low gain mode (balanced)
• +15dBu
• High gain mode (balanced)
• +27dBu
• ÿ
  
  Maximum Input Level
• Balanced inputs
• +30dBu
• Unbalanced inputs
• +20dBu
• ÿ
  
  Impedances
• Balanced inputs
• 30k Ohms
• Unbalanced inputs
• 50k Ohms
• Balanced outputs
• 300 Ohms
• Minimum load impedance
• 300 Ohms
• ÿ
• DIGITAL TO ANALOG CONVERTER FIXED OUTPUTS
  
  Output Levels
• ÿ
• User selectable (0dBFS)
• +16dBu / +24dBu
• Fixed output trim range (0.5dB steps)
• -95.5dB to +30dB
• ÿ
  
  THD+N
• 1kHz, -1dBFS, 20-22kHz bandwidth (44.1kHz)
• 0.0015%
• ÿ
  
  Dynamic Range
• 20-22kHz bandwidth
• >111dB
• ÿ
  
  Input Lock Range
• AES3/SPDIF
• 32kHz to 192kHz
• TOSLINK
• 32kHz to 96kHz
• ADAT LIGHTPIPE
• 30kHz 55kHz
• ÿ
  
  s-Lock Sample Clock Intrinsic Jitter
• 20-22kHz bandwidth
• <25ps
• ÿ
  
  s-Lock Sample Clock Jitter Rejection
• 1kHz sine jitter
• -40dB
• ÿ
  
  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
• ÿ
  
  s-Lock Capture Range
• 44.1, 48kHz
• +/- 10Hz
• 88.2, 96kHz
• +/- 20Hz
• 176.4, 192kHz
• +/- 40Hz
• ÿ
  
  Word Clock / Superclock Inputÿ
• 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)
• ÿ
• POWER SUPPLY / MECHANICAL SPECS
  
  Power consumption
• 40W
• Input Voltage 50-60Hz
• 100, 120, 220, 230-240VAC
• ÿ
  
  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"
• ÿ
  
  Weight
• Main chassis
• 14.1lbs / 6.4kg
• Remote control unit
• 2.3lbs / 1kg
• Power supply unit
• 6.5lbs / 2.9kg

Grace Design m904 Stereo Monitor Controller 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

Accuracy, flexibility, reliability, and sonic purity for your studio. Order now.