GRACE DESIGN  |  Barcode: M905

m905

$5,745.00 CAD
Variant

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.

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

UPC: 823821109055