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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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