Grace Design m900 DAC/Amp
Grace Design m900 DAC/Amp
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Product Description
An updated version of the Massdrop x Grace Design m9XX combo unit, the m900 features the notable addition of an S/PDIF input. This makes it a great pairing for digital audio workstations, where you can plug in to enjoy reference-quality D/A conversion, headphone monitoring, and stereo speaker control Read More
A Much-Loved Design, Now With an S/PDIF Input

An updated version of the Massdrop x Grace Design m9XX combo unit, the m900 features the notable addition of an S/PDIF input. This makes it a great pairing for digital audio workstations, where you can plug in to enjoy reference-quality D/A conversion, headphone monitoring, and stereo speaker control. Plus, the m900 retains the same great sound of the m9XX. Both units were inspired by the world-class m920 DAC/amp and designed to offer the same performance level for audiophile applications, but at a far more accessible price. With the original m9XX, we worked with Michael and Eben from Grace Design to strip the m920 of its lesser-used pro audio hardware and improve upon the audiophile features where possible—all while retaining the high-res DAC implementation and super-clean solid-state amplification. To learn more, check out this review.

Note: At checkout, choose a 110V or 220V USB power adapter.

High-Quality Headphone Amp

The m900 has a direct-coupled design with no capacitors in the signal path and the output amplifier is DC servo-controlled, ensuring zero phase shift for the ultimate in clarity and resolution. High-quality resistors in the circuit path help the m900 deliver a low-noise, low-distortion signal, along with dynamic accuracy and excellent channel matching to the headphones. The amplifier section is built around the TI THS6012 current feedback chipset, but has been modified with a proprietary circuit topology to zero output impedance for a maximized damping factor, even with sensitive IEMs. This allows the m900 to deliver all of the ultra-high resolution and clarity of a current feedback amp with all of the control and dynamics of a zero-output impedance headphone amplifier. The compact m900 even includes crossfeed circuitry that sonically distributes the stereo image across your headphones’ soundstage, helping to reduce listening fatigue over time. Toggle this on or off from the device menu.

Power Supply Reimagined

The power supply design of the m900 is unique. In total, there are five separate power supplies at work delivering clean, isolated power to the digital and headphone amplification sections. The back panel features two micro-B USB connectors, one for connecting to a wall charger and the other for connecting to a USB source. The m900 can independently operate from its USB bus supply up to 100 mW of power into a 32-ohm load (per channel with two channels driven). Plug the device into the wall for additional amplification power up to 1,000 mW into 32 ohms (per channel with two channels driven). The power supply in this compact device is carefully filtered, with multi-tiered noise suppression for artifact-free playback from the sensitive DAC circuits and amplification unrestricted by any annoying buzz or background hiss. All that’s left is your music ripe with dynamic response, crystal-clear detail, and musicality unheard of in this price range.

Specs

Headphone Output Power: Low Power Mode (2 Channels Driven)

  • 22 mW @ 4 Ω
  • 45 mW @ 8 Ω
  • 90 mW @ 16 Ω
  • 100 mW @ 20 Ω
  • 175 mW @ 32 Ω
  • 280 mW @ 50 Ω
  • 83 mW @ 300 Ω
  • 40 mW @ 600 Ω

Headphone Output Power: High Power Mode (2 Channels Driven)

  • 240 mW @ 4 Ω
  • 490 mW @ 8 Ω
  • 940 mW @ 16 Ω
  • 1030 mW @ 20 Ω
  • 950 mW @ 32 Ω
  • 650 mW @ 50 Ω
  • 115 mW @ 300 Ω
  • 57 mW @ 600 Ω

Impedances             

  • Headphone output: 0.08 Ω 
  • Line output: 47.5 Ω

THD+N at Maximum Volume

  • 1kHz, 22H–22kHz BW          
  • 0dBFS in, +14dBV out: k<0.002%

Intermodulation Distortion

  • SMTPE/DIN 4:1 50Hz, 7kHz                    
  • @1.0V out, no load: <0.008%      
  • @1.0V out, 32-ohm load: <0.009%

Frequency Response

  • +/-3dB          
  • Fs=96kHz: 0.5-45.9kHz

Dynamic Range 

  • 20Hz–22kHz bandwidth: 112dB
  • 20Hz–22kHz bandwidth and A weighting filter: 115dB

Output Noise 

  • 20Hz–22kHz, volume = 0-90: -106dBV      
  • A-weighting filter, volume = 0-90: -109dBV      
  • 20Hz–22kHz, volume = 90.5-99.5: -96dBV        
  • A-weighting filter, volume = 90.5-99.5: -98dBV

Crosstalk 

  • 100Hz: <107dB        
  • 1kHz: <98dB
  • 20kHz: <72dB

Attenuation Range

  • 0 to -99dB, 0.5dB steps

Channel Tracking Accuracy

  • +/-0.05dB

Maximum Output Level

  • +14dBV (5.1V)

THD+N 

  • 1kHz, -1dBFS, (0dBFS = +20dBu), 20Hz–22kHz bandwidth: 0.0006%                   

Dynamic Range                 

  • 20Hz–22kHz bandwidth, 0dBFS = +20dBu (AES17 filter): 117dB
  • 20Hz–22kHz bandwidth, 0dBFS = +20dBu (A-weighted): 119dB

Sample Rate       

  • TOSLINK:    
  • 44.1 kHz +/- 400 Hz
  • 48 kHz +/- 700 Hz
  • 88.2 kHz +/- 1200 Hz
  • 96 kHz +/- 1300 Hz   
  • USB:
  • 44.1, 48, 88.2, 96, 176.4, 192, 352, 384 kHz
  • DSD64, DSD128
  • S/PDIF:
  • 44.1 kHz (Lock range: 43870–45420 Hz)
  • 48 kHz (Lock range: 46590–49220 Hz)
  • 88.2 kHz (Lock range: 87760–90830 Hz)
  • 176.4 kHz (Lock range: 93520–98430 Hz)
  • 192 kHz (Lock range: 175700–181540 Hz)

Power Consumption

  • Max, high-power mode: 8.0W
  • Max, low-power mode: 2.5W     

Dimensions

  • 4 x 5.25 x 1.8 in (10.2 x 13.3 x 2.6 cm)   
Included
  • Printed owner manual
  • 6 ft (1.8 m) USB cable (gold-plated connectors, ferrite bead)
  • 10 ft (3 m) USB cable (gold-plated connectors, ferrite bead)
  • USB power adapter (110V or 220V, choose at checkout)
Shipping

All orders will be shipped by Drop.

Estimated ship date is Sep 22, 2020 PT.

Payment will be collected at checkout. After this product run ends, orders will be submitted to the vendor up front, making all orders final. Check the discussion for updates on your order.