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Grace Design m900
Portable Headphone Amp / DAC / Preamp

OUR PART #:  M900

A portable, desktop-friendly combination headphone amplifier / DAC / preamp...
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Our Price: $499.00
List Price: $525.00
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Grace Design m900
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A portable, desktop-friendly combination headphone amplifier / DAC / preamp, the Grace Design m900 is made to offer audio professionals and enthusiasts musical and transparent audio playback from USB, S/PDIF, or TOSLINK sources. For small DAW studio setups, portable laptop editing or mixing rigs, or just pure playback enjoyment, the m900 provides the same analog and DAC quality as Grace's large monitor controllers, but in a unit that's rugged, portable, and surprisingly affordable. It uses the latest generation AKM 4490 chip, which features 32-bit processing and support for sample rates up to 384 kHz PC or 256x DSD. It has a USB interface that operates in asynchronous mode, which enables it to be the clock master, making the system immune to USB bus jitter. S/PDIF and Toslink inputs let the m900 connect to any DAW interface with true reference-quality D/A conversion, headphone monitoring, and stereo speaker control. It also features an intelligent power supply design that offers 2 power operation modes - LOW and HIGH. LOW power mode is from USB connector #1, which provides bus power along with data, so it can operate from a single connection to your computer. The HIGH power power mode is available by connecting the included 2A USB DC power supply to the USB connector #2, which brings additional power to drive headphones. Its transimpedance amplifier topology coupled to a zero-ohm output impedance driver delivers headphone performance that's incredibly spacious and transparent along with a tight, enveloping low end. Grace's latest generation crossfeed circuit rounds out the design by simulating an acoustic listening environment in the headphones, offering surprise details that make familiar tracks new again, while audio production tasks like tracking, mixing and editing can be done faster and easier.

Grace Design m900 Features:

  • USB, S/PDIF, and Toslink digital inputs, supports up to 192 kHz (Toslink up to 96 kHz)
  • Asynchronous USB interface for jitter-free computer audio playback, supports up to 384 kHz PCM and 256x DSD
  • Dual zero-ohm output impedance headphone outputs
  • Unbalanced level controlled outputs via RCA for connecting to a stereo monitor system
  • Compact, portable chassis perfect for travel, desktop, or studio
  • Low power mode via USB Bus power
  • High power mode via included USB 2A power supply
  • (4) different DAC filter settings to tailor playback performance to personal preference
  • Simple user setup menu for setup and calibration
  • (7) segment LED display displays level and setup menu information
  • Large rotary encoder for volume control and setup menu navigation
  • Made in Lyons, CO USA
  • Five year transferable Warranty

Grace Design m900 Specifications:

  • THD+N 1kHz, 22 Hz-22 kHz BW:
    • @1.0V out, no load: <0.002%
    • @1.0V out, 32 Ohm load: <0.010%
  • Intermodulation Distortion SMTPE/DIN 4:1 50 Hz, 7 kHz:
    • @1.0V out, no load: <0.008%
    • @1.0V out, 32 Ohm load: <0.009%
  • Frequency Response +/-3dB: Fs = 96 kHz: 0.5 - 45.9 kHz
  • Dynamic Range:
    • 20-22kHz bandwidth: 112 dB
    • 20-22kHz bandwidth and A weighting filter: 115 dB
  • Output Noise:
    • 20 - 22 kHz, volume = 0 - 90: -106 dBV
    • A weighting filter, volume = 0 - 90: -109 dBV
    • 20 - 22 kHz, volume = 90.5 - 99.5: -96 dBV
    • A weighting filter, volume = 90.5 - 99.5: -98 dBV
  • Crosstalk:
    • 100 Hz: <107dB
    • 1 kHz: <98dB
    • 20 kHz: <72dB
  • Attenuation Range: 0 to -99 dB, 0.5 dB steps     
  • Channel Tracking Accuracy: +/-0.05 dB     
  • Maximum Output Level, No load:
    • Low Power Mode: +14.1dBV (5.1V)
    • High Power Mode: +15.5dBV (6.0V)
  • Impedances
    • Headphone Output: 0.08 Ohms
    • Line Output: 47.5 Ohms
  • Input Lock Range   —   Sample Rate            Lock Range
    • S/PDIF:
                                   44.1 kHz                  43870-45420 Hz
                                   48 kHz                     46590-49220 Hz
                                   88.2 kHz                  87760-90830 Hz
                                   96 kHz                     93520-98430 Hz
                                   176.4 kHz                175700-181640 Hz
                                   192 kHz                   187050-196380 Hz
    • Toslink:
                                    44.1kHz                   43900-45410 Hz
                                    48 kHz                     46590-49190 Hz
                                    88.2 kHz                  87840-90830 Hz
                                    96 kHz                     93520-97530 Hz 
  • USB supported sample rates, kHz: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384
  • Power Consumption:
    • Max, High Power mode: 8.0W
    • Max, Low Power mode: 2.5W
  • Dimensions: 4" x 5.25" x 1.8"     
  • Headphone Output Power / Low Power Mode - Output Power mW:  
    Load Resistance, Ohms           1 Channel Driven   2 Channels Driven
          4                                           80                         22
          8                                           140                       45
          16                                         310                       90
          20                                         350                       100
          32                                         600                       175
          50                                         560                       280
          300                                       83                         83
          600                                       40                         40
  • Headphone Output Power / High Power Mode - Output Power mW:  
    Load Resistance, Ohms           1 Channel Driven   2 Channels Driven
         4                                            925                       240
         8                                            1800                     490
         16                                          1900                     940
         20                                          1575                     1030
         32                                          1020                     950
         50                                          680                       650
         300                                        115                       115
         600                                        57                         57

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