Grace Design m905-BK High Fidelity 2.1 Monitoring System / D/A Converter with Remote Control
The Grace Design m905-BK is a second-generation stereo monitor controller and D/A converter, engineered for unrivaled audio purity and a robust feature set. With mastering-grade DAC performance, ultra-low jitter s-Lock™ PLL clock regeneration, and an asynchronous USB Class 2 interface, the m905 delivers breathtaking playback quality. Housed in a 2U rackmount mainframe with a sleek remote control unit (RCU), this system blends analog transparency with digital precision, supporting DSD128 (5.6448 MHz) via DoP v1.1 and digital speaker control through AES and S/PDIF outputs.
Exceptional Audio Playback
Designed for sonic excellence, the m905 features meticulous analog circuitry with outstanding dynamic range (121 dB A-weighted), low distortion (<0.0008% THD+N at +20 dBu), and minimal noise (-102 dBu A-weighted). Its mastering-quality DAC and wide input compatibility—including AES3, S/PDIF, TOSLINK, ADAT, and USB—make it a versatile hub for any studio, effortlessly handling PCM up to 192 kHz and DSD formats for stunningly natural sound.
Intuitive Control and Flexibility
The hybrid RCU combines hardware switches, a rotary encoder, and a color LCD for seamless operation. Primary controls are tactile, while the GUI offers advanced features like input/output naming, level calibration, and preset settings—all accessible with minimal navigation. With three stereo speaker outputs, dual subwoofer modes, talkback, and a built-in SPL meter, the m905 adapts to any monitoring need, enhanced by new firmware for digital speaker control.
Studio Centerpiece with Robust Design
Built in the USA with a 20-year warranty, the m905’s timeless design and rock-solid performance make it the ultimate studio companion. Its ability to transfer 10 channels of digital audio over USB and support for multi-channel setups via ADAT and AES3 ensures flexibility, while the detachable RCU tilt base and premium headphone amp add practicality and power to your workflow.
Key Features of the Grace Design m905-BK
- Transparent, musical audio circuitry with mastering-grade DAC performance
- Supports DSD128 (5.6448 MHz) via DoP v1.1 over AES3, S/PDIF, and USB
- s-Lock™ dual-stage PLL for ultra-low jitter clock regeneration
- Asynchronous USB Class 2 interface (24-bit/192 kHz) eliminates computer jitter
- Hybrid RCU with hardware controls, LCD display, talkback mic, and SPL meter
- 3 stereo speaker outputs, 2 assignable mono sub outputs, mono/dim/mute modes
- Digital inputs: 2x AES3, S/PDIF, TOSLINK, ADAT (8-channel or 4-channel S/MUX), USB
- Analog inputs: Balanced, unbalanced (optional RIAA phono), CUE, talkback mic
- Digital loop-thru and configurable SUB/DAC/METER outputs
- 20-year warranty on parts and labor, made in the USA
Technical Specifications
- Gain Range: -104 dB to +13 dB
- THD+N (1 kHz, 22 Hz-22 kHz BW): <0.0008% (+20 dBu/+10 dBu), <0.002% (0 dBu)
- Dynamic Range: 118 dB (20-22 kHz), 121 dB (A-weighted)
- Output Noise: -99 dBu (20-22 kHz), -102 dBu (A-weighted) @ -20 dB Gain
- Frequency Response: Balanced: 3 Hz-1.25 MHz (±3 dB), Unbalanced: 3 Hz-275 kHz (±3 dB)
- Maximum Output: +26 dBu, DAC Fixed Output: -76 dBu to +24 dBu (0.5 dB steps)
- Impedance: Balanced Inputs: 88 kΩ, Unbalanced: 53 kΩ, Outputs: 300Ω
- Digital Inputs Lock Range: 44.1 kHz ±400 Hz to 192 kHz ±2000 Hz, ADAT: 44.1 kHz ±50 Hz to 96 kHz ±70 Hz
- Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192 kHz; DSD64 (2.8224 MHz), DSD128 (5.6448 MHz)
- Power Consumption: 60W, 100-240VAC, 50-60 Hz
- Dimensions: Main Chassis: 3.5”H x 10.5”W x 17”D; RCU: 8.9”L x 5.1”W x 2.2”H
- Weight: Main Chassis: 7.8 lbs, RCU: 2.2 lbs
