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Grace Design m904b High-Fidelity Stereo Monitor Controller

B&H # GRM904B MFR # A904B
No Longer Available
Product Highlights
  • Includes m904RCU Remote

The m904b from Grace Design is a high-quality, rack-mountable monitor controller that offers the same features and technology as Grace Design's m906 controller, but for stereo monitoring only. Ideal for studios that do not have the need for 5.1 audio, the m904b offers full integration with all types of equipment thanks to a wide range of analog and digital connectors, including XLR, RCA, S/PDIF, AES3, TOSLink, and ADAT. All controls are built into the m904RCU wired remote, which sits conveniently on the desktop so you don't have to disturb the rack-mounted main unit once your connections are made.

An XLR talkback microphone input with 48V phantom power is available, with talkback controls on the remote. Other controls available on the remote include main and headphone level controls, muting, dim, input selection, and speaker selection. Up to three sets of stereo monitors can be managed and controlled with the m904b. Other features of the m904b include sLock PLL clock regeneration for low jitter and great stability. For audiophile performance with a wide variety of features, the m904b is a terrific option.

Audiophile-grade stereo monitoring control and calibration
Rack-mountable main unit provides a variety of connectors, including analog XLR and RCA, as well as digital S/PDIF, TOSLink, AES3, and ADAT
Digital inputs accept 24-bit/192kHz signals
sLock PLL clock regeneration provides very low jitter and solid digital stability
All controls are found on the wired remote, including source selection, speaker selection, muting, dim, main and headphone level control, and talkback control
XLR talkback mic input with 48V phantom power
Headphone and main level controls have a 100dB range with 0.5dB steps
Supports up to three sets of stereo monitors
Fixed-level DAC output allows direct audio transfers
Two headphone jacks, one on main unit and one on remote, for monitoring and mixing
Input Impedance 30 k ohms, Balanced
50 k ohms, Unbalanced
Output Impedances 300 ohms, Balanced
Sensitivity (0 VU) Not Specified by Manufacturer
Maximum Input Level +30dBu, Balanced
+20dBu, Unbalanced
Maximum Output Level +15dBu, Low Gain Mode, Balanced
+27dBU, High Gain Mode, Balanced
Noise -86dBu, High Gain Mode (20-22kHz Bandwidth, -20dB Gain)
-96dBu, Low Gain Mode (20-22kHz Bandwidth, -20dB Gain)
THD + N Less than 0.002% (1kHz, -1dBFS, 20-22kHz Bandwidth)
Crosstalk Less than 100dB @ 100Hz
Less than 100dB @ 1kHz
Less than 85dB @ 20kHz
Input Connections 1 x AC Power Input
1 x Word Clock/Super Clock In
1 x ADAT Digital Input
2 x AES3 Digital Stereo XLR Inputs
1 x S/PDIF RCA Digital Stereo Input
1 x TOSLink Digital Stereo Input
2 x Unbalanced Analog RCA Inputs (1 Stereo Pair)
1 x XLR Talkback Mic Input
4 x Balanced XLR Analog Inputs (2 Stereo Pairs)
2 x Balanced XLR Cue Inputs (1 Stereo Pair)
1 x 1/4" Talkback Mic Switch Jack
Output Connectors 1 x 1/4" Headphone Jack
1 x DB15 Female Remote Connector
1 x AES3 Digital XLR Loop-Thru Output
1 x S/PDIF Digital RCA Loop-Thru Output
1 x Word Clock/Super Clock Thru BNC Connector
2 x XLR Cue Outputs (1 Stereo Pair)
4 x XLR Control Room Outputs (2 Stereo Pairs)
2 x Fixed DAC AES3 XLR Outputs (1 Stereo Pair)
Meters 1 x Green Power LED
Talkback Mic 1 x XLR Talkback Mic Input with 48V Phantom Power
Headphone Output 1 x 1/4" Jack
Dimensions (WxDxH) 17 x 10.5 x 3.5" (432 x 267 x 89mm)
Weight 14.1 lbs (6.4kg)
Grace Design m904b High-Fidelity Stereo Monitor Controller
  • m904RCU Remote Control
  • AC Power Cord
  • 4 x Self-Adhesive Rubber Feet
  • Grace Design Literature
  • Warranty Card
  • 5-Year Limited Warranty
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