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GRACE DESIGN

m905

Monitoring Controls

Reference monitor controller, transparent audio playback, mastering-grade DAC, .5dB step control, 3 speaker outputs, sub/meter/DAC out, USB, ADAT, AES, S/PDIF, talkback mic

$5,745.00 CAD
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Description

The Grace Design M905 is a professional-grade reference monitor controller built for critical listening, precision routing, and full system control in high-end studio environments. It serves as the centerpiece for complex monitoring setups, offering reliable control over multiple audio sources, speaker outputs, and headphone mixes. The system includes two main components: the Audio Control Unit (ACU), which handles all audio connections, and the Remote Control Unit (RCU), which provides intuitive control via a color display, tactile buttons, and a large rotary encoder.

The M905 supports a wide range of analog and digital inputs, including USB, AES3, ADAT, S/PDIF, and TOSLINK. It accommodates high-resolution formats such as DSD64 and DSD128, as well as PCM audio up to 24-bit/192kHz. Users can select from three stereo speaker outputs, engage dual headphone outputs, and operate a built-in talkback system for cue and communication. Additional features include crossfeed simulation for headphone monitoring, programmable volume presets, mono and solo functions, and SPL metering. An analog-only version is also available, with optional upgrades like a high-performance phono preamp for turntable integration.

Features

Flexible Input Options
Supports both analog and digital inputs, including USB, AES, S/PDIF, ADAT, and Toslink.

High-Quality DAC
Delivers mastering-grade digital-to-analog conversion with ultra-low jitter.

USB Audio Interface
Enables high-resolution playback from a computer and supports audio return channels.

Advanced Volume Control
Precise 0.5 dB step control for accurate speaker and headphone volume adjustments.

Multiple Speaker Outputs
Switch between three stereo speaker systems and assignable subwoofer outputs.

Dual Headphone Outputs
Independent high-fidelity headphone jacks on both the main unit and remote.

Talkback System
Includes a built-in talkback mic and input for an external mic, with dim control during communication.

Real-Time SPL Metering
Displays current and peak sound pressure levels with A/C weighting and fast/slow modes.

Customizable Monitoring Modes
Includes mono, dim, solo, sub mute, and crossfeed modes for flexible listening.

Programmable Setup and Presets
Store user-defined settings for volume levels, input names, and more.

Graphical Remote Control Unit (RCU)
Features a bright LCD screen, rotary encoder, and hardware buttons for full system control.

Infrared Remote Compatibility
Can be controlled by optional Grace Design, Apple, or smartphone remotes.

Phono Input Option
Optional RIAA phono stage supports turntable connection.

Digital Output Looping
Send selected digital input to external gear for routing or monitoring.

Upgradeable Firmware
Easily update all system firmware via USB to stay current.

Sturdy Construction
Built with durable materials and includes a five-year transferable warranty.

Specifications

General Specifications
Device Type: Stereo Compressor/Limiter
Chassis: 1U Rackmount
Power Requirements: 100–240 VAC, 50–60 Hz, Auto-Switching
Power Consumption: 20 Watts
Dimensions: 1.75" (H) x 19" (W) x 10" (D)
Weight: 8 lbs

Audio Performance
Frequency Response: ±0.25 dB, 20 Hz–20 kHz
THD+N: < 0.01% (typical)
Dynamic Range: > 110 dB
Crosstalk: < –80 dB

Compressor Section
Compression Ratio: 1.2:1 to 20:1
Threshold: –40 dBu to +20 dBu
Attack Time: 0.01 ms to 200 ms
Release Time: 0.05 s to 3 s
Knee: Soft/Hard (variable depending on ratio)
Auto Mode: Adaptive time constants
Link Mode: Stereo linking with intelligent channel tracking

Limiter Section
Threshold: Adjustable, independent from compressor
Attack Time: Fixed fast attack
Release Time: Adaptive

Input/Output
Inputs: 2 x XLR (balanced)
Outputs: 2 x XLR (balanced)
Sidechain Input: 2 x TRS ¼" (balanced)
Maximum Input Level: +27 dBu
Maximum Output Level: +27 dBu
Input Impedance: 20 kΩ (balanced)
Output Impedance: 50 Ω (balanced)

Control & Display
Front Panel Controls: Threshold, Ratio, Attack, Release, Makeup Gain, Bypass
Display: Dual Analog-style Gain Reduction Meters

Additional Features
True Relay Bypass: Yes
Calibration: Internal trimmers for meter calibration
Cooling: Passive convection

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