Grace Design m900 - Desktop DAC Headphone Amplifier - Compact Powerhouse
The Grace Design m900 Desktop DAC Headphone Amplifier is a portable, high-performance solution for audio professionals and enthusiasts, delivering transparent playback from USB, S/PDIF, or TOSLINK sources. Combining reference-quality DAC and amplifier technology from our flagship monitor controllers, the m900 fits seamlessly into small DAW setups, laptop rigs, or personal listening spaces—all in a rugged, affordable package crafted in Lyons, Colorado.
Incredible DAC Performance
Powered by the AKM 4490 chip with 32-bit processing, the m900 supports up to 384 kHz PCM and 256x DSD, using an asynchronous USB interface to eliminate bus jitter as the clock master. S/PDIF and TOSLINK inputs (up to 96 kHz) enhance any DAW interface with pristine D/A conversion, offering superb headphone monitoring and stereo speaker control.
Superb Audio and Flexible Power
The transimpedance amplifier topology and zero-ohm output driver deliver spacious, transparent sound with tight bass, enhanced by a next-gen crossfeed circuit for an immersive headphone experience. Dual power modes—Low (USB bus-powered) and High (with included 2A USB supply)—cater to various headphones, from easy-to-drive models to power-hungry cans, with up to 1900 mW per channel in High Power Mode.
Portable Design, Intuitive Control
Encased in a compact chassis, the m900 features a 7-segment LED display and rotary encoder for volume and setup navigation, with four DAC filter options to tailor playback. Monitoring modes (stereo, mono, L/R swap), channel balance, and RCA outputs for stereo systems make it a versatile desktop companion, backed by a 5-year transferable warranty.
Key Features of the Grace Design m900
- USB, S/PDIF, and TOSLINK inputs (up to 384 kHz PCM, 256x DSD)
- Asynchronous USB for jitter-free computer audio playback
- Dual zero-ohm headphone outputs with transimpedance topology
- Low Power Mode (USB bus) and High Power Mode (2A USB supply)
- Unbalanced RCA outputs for stereo monitor systems
- 6 monitoring modes: stereo, L/R swapped, mono L, mono R, L only, R only
- Crossfeed circuit for acoustic simulation in headphones
- 4 DAC filter settings for personalized sound
- Compact 4” x 5.25” x 1.8” chassis, made in the USA
- 5-year transferable warranty
Technical Specifications
- THD+N (1 kHz, 22 Hz-22 kHz BW): <0.002% (1V out, no load), <0.010% (1V out, 32Ω)
- Intermodulation Distortion (4:1, 50 Hz/7 kHz): <0.008% (no load), <0.009% (32Ω)
- Frequency Response (96 kHz): 0.5 Hz-45.9 kHz (±3 dB)
- Dynamic Range: 112 dB (20-22 kHz), 115 dB (A-weighted)
- Output Noise: -106 dBV (20-22 kHz, 0-90 volume), -109 dBV (A-weighted, 0-90)
- Crosstalk:
- Attenuation Range: 0 to -99 dB (0.5 dB steps)
- Maximum Output (No Load): Low Power: +14.1 dBV (5.1V), High Power: +15.5 dBV (6.0V)
- Impedance: Headphone Output: 0.08Ω, Line Output: 47.5Ω
- Input Lock Range: S/PDIF: 44.1 kHz ±43870-45420 Hz to 192 kHz ±187050-196380 Hz; TOSLINK: 44.1 kHz ±43900-45410 Hz to 96 kHz ±93520-97530 Hz
- Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz; DSD256
- Power Consumption: 8W (High), 2.5W (Low)
- Dimensions: 4”L x 5.25”W x 1.8”H
Headphone Output Power
- Low Power Mode (mW): 4Ω: 80/22, 16Ω: 310/90, 32Ω: 600/175, 600Ω: 40/40 (1/2 channels)
- High Power Mode (mW): 4Ω: 925/240, 16Ω: 1900/940, 32Ω: 1020/950, 600Ω: 57/57 (1/2 channels)
