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Grace Design m905 Reference Monitor Controller

B&H # GRM905 MFR # A905
Grace Design m905 Reference Monitor Controller

Grace Design m905 Reference Monitor Controller Back View Remote Top View Remote Back View

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Product Highlights

  • Mastering Class Monitor Controller & DAC
  • 3x Stereo Pairs of Speaker Outputs
  • 2x Assignable Mono Sub Outputs
  • Balanced and Unbalanced Analog Inputs
  • AES, S/PDIF and ADAT Digital Inputs
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You Pay: $3,325.00

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The Grace Design m905 is a reference monitor controller and high-quality digital-to-analog converter, designed to deliver mastering-quality monitoring to your home or professional studio.

Featuring balanced and unbalanced analog inputs, and AES, S/PDIF and ADAT digital inputs, the m905 allows you to switch between a variety of input sources. Additionally, the unit has three stereo pairs of balanced speaker outputs with two assignable mono sub outputs, giving you a versatile selection of monitoring options when mixing or mastering.


Balanced and unbalanced analog inputs
CUE & talkback mic
2x AES3 , 1x S/PDIF, 1x TOSLINK, ADAT (selectable in 4 pairs, or 2 pairs in S/MUX), USB & DSD128 (5.6448MHz)
Audio circuitry designed for transparent playback
Asynchronous Class 2 USB playback supports up to 24 bit / 192 kHz
Mastering quality DAC circuitry with configurable de-emphasis filtering
s-lock dual-stage Phase Lock Loop for low jitter clock regeneration
Hybrid RCU with hardware switches, large level encoder, and graphical LCD
LCD display shows input, level, output, SPL, and DAC status plus a full calibration menu
RCU includes built-in microphone for talkback and onboard SPL meter
SPL meter features include level, peak, fast and slow modes, and A & C weighting
Precision 0.5 dB step level control for speakers and headphones
Reference headphone amplifier circuitry, with outputs on both the RCU and ACU
Dedicated mono, dim, mute, and sub mute switches
Mono mode can be set to L+R summed, L only in both channels, or R only in both channels
L solo, R solo, L-R, and sub solo modes available
3 available stereo speaker outputs, with 2 assignable mono sub outputs (or single stereo sub output)
Multi-mode SUB / DAC / METER out
SUB out mode for stereo or multiple mono subwoofer outputs
DAC out mode for a fixed DAC output fed by the selected digital input
METER out mode fed by selected input signal (digital or analog), configurable with a fixed level or to follow the monitor level
Detachable RCU tilt base
Analog I/O
THD + N At Maximum Volume, 1 kHz, 22 Hz to 22 kHz BW
+20 dBu Out: <0.0008%
+10 dBu Out: <0.0008%
0 dBu Out: <0.002%
Distortion Inter-Modulation Distortion SMPTE / DIN 4:1 50 Hz, 7 kHz
At +20 dBu Out: <0.002%
At 0 dBu Out: <0.0015%
Frequency Response Balanced Inputs +/-3 dB: 3 Hz to 1.25 MHz
Unbalanced Input +/-3 dB: 3 Hz to 275 kHz
Dynamic Range 20 to 22 kHz Bandwidth: 118 dB
20 to 22 kHz Bandwidth and A-Weighting Filter: 121 dB
Output Noise 20 to 22 kHz Bandwidth, at -20 dB Gain: -99 dBu
20 to 22 kHz Bandwidth and A-Weighting Filter, at -20 dB Gain: -102 dBu
Deviation Phase Deviation:
20 Hz to 20 kHz: <10°
10 Hz to 100 kHz: <19°
Cross Talk Crosstalk Any Channel:
100 Hz: <104 dB
1 kHz: <100 dB
20 kHz: <79 dB
Balanced Input For Balanced Input:
60 Hz: >90 dB
1 kHz: >85 dB
10 kHz: >70 dB
Gain Range -104 dB to +13 dB
Channel Channel Tracking Accuracy: +/-0.1 dB
Maximum Output Level +26 dBu
Maximum Input Level Balanced Inputs: +29 dBu

Unbalanced Inputs: +21 dBu

Impedance Balanced Inputs: 88 kΩ

Unbalanced Inputs: 53 kΩ

Balanced Outputs: 300 Ω

Minimum Load Impedance: 300 Ω

Mic Pre Gain External Talkback Mic Preamp Gain: +7 dB to +70 dB in 1 dB steps
DAC Output
Output Level User Selectable (0 dBFS): -76 dBu to +24 dBu in 0.5 dB steps
Fixed output trim range: (0.5 dB steps)
THD + N 1 kHz, -1 dBFS, (0 dBFS = +20 dBu), 20 to 22 kHz Bandwidth: 0.0006%
Dynamic Range 20 to 22 kHz Bandwidth, 0 dBFS = +20 dBu (AES 17 filter): 117 dB

20 to 22 kHz Bandwidth, 0 dBFS = +20 dBu (A-weighted): 119 dB

Lock Range AES3 / SPDIF:

44.1 kHz +/-400 Hz

48 kHz +/-700 Hz

88.2 kHz +/-1200 Hz

96 kHz +/-1300 Hz

176.4 kHz +/-2000 Hz

192 kHz +/-2000 Hz


44.1 kHz +/-400 Hz

48 kHz +/-700 Hz

88.2 kHz +/-1200 Hz

96 kHz +/-1300 Hz


8 Channels at 44.1 kHz and 48 kHz

4 Channels at 88.2 kHz and 96 kHz (s/mux)

44.1 kHz +/-50 Hz

48 kHz +/-70 Hz

88.2 kHz +/-50 Hz

96 kHz +/-70 Hz



48 kHz 

88.2 kHz 

96 kHz 

176.4 kHz 

192 kHz 

DSD64 2.8224 MHz

DSD128 5.6448 MHz

Capture Bandwidth s-Lock Capture Range

44.1 kHz: +/- 6 Hz

48 kHz: +/- 7 Hz

88.2 kHz: +/- 14 Hz

96 kHz: +/- 20 Hz

176.4 kHz: +/- 24 Hz

192 kHz: +/- 30 Hz

Word Clock Impedance (switchable): 75 ohm / 1 Mohm
Minimum Voltage: 3V peak to peak
Maximum Voltage: 5V peak to peak
Word Clock Frequencies Supported: 44.1, 48, 88.2, 96, 176.4, 192 kHz
Superclock Frequencies Supported: N/A
Power Supply
Power Consumption 60 W
Input Voltage 100 to 240 VAC 50-60 Hz
Dimensions Main Chassis IEC 2U: 3.50 x 10.50 x 17.00" (8.89 x 26.67 x 43.18 cm)

Remote Control Unit: 8.90 x 5.10 x 2.20" (22.61 x 12.95 x 5.59 cm)

Weight Main Chassis: 7.80 lb (3.54 kg)

Remote Control Unit: 2.20 lb (1.00 kg)

Grace Design m905 Reference Monitor Controller
  • Audio Control Unit (ACU)
  • Remote Control Unit (RCU)
  • RCU Tilt Base and Accompanying Hardware
  • 25' Serial Cable
  • 6' AC Power Cable
  • Rubber Feet and Rack Screws
  • Limited 5-Year Warranty
  • Be the first to review this item


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