The m904 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 m904 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 front panel of the unit for easily accessible controls. If desired, the m904RCU wired remote (sold separately) can be added allowing you to select between local or remote control.
An XLR talkback microphone input with 48V phantom power is available, with talkback controls on the front panel and on the optional remote. Other controls 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 m904. Other features of the m904 include sLock PLL clock regeneration for low jitter and great stability. For audiophile performance with a wide variety of features, the m904 is a terrific option.
| Input Impedance |
30 kOhms, Balanced 50 kOhms, 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 |
2 x 1/4" Headphone Jacks 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 2 x LCD Level Meters 1 x LCD Menu Screen |
| Talkback Mic | 1 x XLR Talkback Mic Input with 48V Phantom Power |
| Dimensions (WxDxH) | 17 x 10.5 x 3.5" (432 x 267 x 89mm) |
| Weight | 14.1 lbs (6.4kg) |