m908 RCU left detail


stereo / surround / immersive reference monitor controller

Tech Bulletin Dolby Atmos Target Curve EQ Settings

We have released new system firmwarev.1.0.9. Please visit our support page to download this update and its accompanying documentation.

The m908 Monitor Controller is designed for speaker systems up to 24 channels, from stereo to  SONY 360RA™,  Dolby Atmos™ 22.2 and any format in between. Built on our legacy of reference audio design, the m908’s audio performance delivers impeccable clarity and detail. Our latest generation AD / DA converters provide incredible dynamic range and resolution, while all new analog circuitry is designed to be effortlessly transparent and musical.

The m908 system consists of a mainframe audio control unit, remote control unit, and a power supply with dual-redundant universal input power modules. The remote control is based on our m905 stereo monitor controller, but scaled up to accommodate added features and playback channel count.

m908 at Blackbird

Grace m908 at Blackbird Studio

Standard features include a total of 68 digital input channels via AES3, TOSLINK, S/PDIF, ADAT Lightpipe, and USB2. Outputs include 16 balanced analog output channels and 24 digital output channels. Up to 16 channels of analog inputs are available with the addition of the optional 8 channel ADC modules, and an additional option module slot provides up to 32 additional digital I/O channels via Dante™ or DigiLink™.

Up to 24 input channels can be received simultaneously and routed to the 24 channel processor, and sample rates of up to 192kHz / 24bit are supported. A powerful DSP section allows for 12 bands of parametric room correction EQ on every  channel (or variable numbers of bands per channel totaling up to 85), comprehensive bass management features, and individual channel delay.

The m908 is a fully self contained plug and play monitor controller, with a full complement of monitoring features including cue channels, built in talkback mic, mono, mute and dim controls, and an exhaustive list of functions relating to surround and immersive playback systems. It is designed to enable professionals and facilities to update their workflows for immersive audio playback with a minimum of effort and cost.

While the software configurability is very impressive, the quality of the hardware is crucial, and the m908 has the wonderfully well-engineered character we’ve come to expect from Grace Design. – Hugh Robjohns, Sound on Sound Magazine (full review here)

m908 at Real World Studio
The m908 installed at Real World Studio's Red Room


  • Standard digital inputs include: 24 channel AES3 digital, 16 channel ADAT Lightpipe,
    USB 24 channel inputs, AES3, S/PDIF, and TOSLINK stereo inputs
  • Analog inputs are optional: 8 channel ADC module for 8 or 16 channel analog inputs – these modules are sold separately
  • Standard outputs include: 24 channel AES3 digital out, 16 channel analog balanced out, 24 channels USB2 out
  • Optional Dante™ or DigiLink™ module for an additional 32 channels of I/O
  • 4th generation s-Lock pll clocking system for vanishingly low jitter
  • High resolution volume control
  • Complete bass management capability
  • 12 bands of parametric room correction EQ on every channel / variable numbers of bands per channel totaling up to 85
  • 64-bit fixed-point filters for room correction and bass management
  • Channel level and delay calibration
  • Comprehensive downmix control
  • Built in real time SPL meter
  • Powerful and intuitive remote control unit for access to all system controls and calibration
  • Dual redundant external power supply
  • Reference quality headphone amplifier with cross-feed
  • Flexible talkback system with built-in mic on remote control and mic input for external talkback mics
  • Up to 8 stereo CUE paths
  • 4 General Purpose Input and Output pins for interfacing to external systems

The Grace Design EON and STANDARD Warranties

We back up everything we make with either our unrivaled 20 year EON limited warranty, or the 5 year standard limited warranty. These represent the best coverage in the business and prove our commitment to the quality, serviceability and long term value of Grace Design products.

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