Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp

Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp

Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp

B&H # GRA900 MFR # A900
Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp

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Product Highlights

  • Digital Inputs: USB, S/PDIF, TOSLINK
  • Supports Up to 192 kHz (TOSLINK: 96 kHz)
  • Two Zero-Ohm Headphone Outputs
  • Stereo RCA: Monitoring Control
  • High and Low Power Modes
  • DAC Filter Settings for Custom Playback
  • Display: 7-Segment LED
  • Large Rotary Encoder for Volume and Data
  • Includes Power Supply and USB Cables
  • 5-Year Limited Warranty
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Grace Design A900 overview

  • 1Description

The Grace Design m900 is a compact, portable headphone amplifier, DAC, and preamp, well suited for audio professionals, music enthusiasts, or anyone looking for transparent playback from USB, S/PDIF, or TOSLINK sources. For small DAW setups, the m900 provides the same analog and DAC quality as Grace Design's large monitor controllers, but in a rugged, portable, and surprisingly affordable unit.

The heart of the Grace Design m900 features the latest generation AKM 4490 chip, which includes 32-bit processing and support for sample rates up to 384 kHz or DSD256. The USB interface operates in asynchronous mode allowing the m900 to be the clock master, which makes the system immune to USB bus jitter. S/PDIF and TOSLINK inputs enhance any DAW interface with true reference-quality D/A conversion, headphone monitoring, and stereo speaker control.

The intelligent power supply design allows for two power operation modes, Low and High. Low power mode is derived from USB connection 1, which provides bus power along with data, allowing simple operation from a single connection to a computer. High power mode is available by connecting the included 2A USB DC power supply to USB connector 2, which provides additional power for high-impedance headphones.

The Grace Design m900 utilizes trans-impedance amplifier topology coupled to a zero-ohm output impedance driver for headphone performance that is spacious and transparent with a tight, enveloping low end, while the latest generation cross-feed circuit rounds out the design by emulating an acoustic listening environment in the headphones. The Grace Design m900 ships with a 2A USB power supply and two USB Type-B mini-cables (6' and 10'.)

  • 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 DSD256
  • 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
  • Four different DAC filter settings to tailor playback performance to personal preference
  • Simple user setup menu for setup and calibration
  • Display: 7-segment LED displays level and setup menu information
  • Large rotary encoder for volume control and setup menu navigation
  • Made in the USA
  • 5-year transferable warranty
UPC: 823821009003
In the Box
Grace Design m900 Compact, Portable Headphone Amp, DAC, and Preamp
  • USB Wall Power Supply
  • 2 x USB Type-B Mini Cable: 6' and 10'
  • Limited 5-Year Warranty
  • Table of Contents
    • 1Description

    Grace Design A900 specs

    Connectors Inputs
    Digital Inputs: S/PDIF and TOSLINK
    USB Power: Micro-USB 5 V, 2 A (high power input)
    USB Data: Micro-USB 2.0 (for data, signal, bus power input)

    Stereo Line Outputs: RCA (L/R)
    Headphone: 2 x 1/4" / 6.35 mm
    Display 7-segment LED
    THD + N THD+N 1 kHz, 22 Hz - 22 kHz BW
    @1.0 V Out, No Load: <0.002%
    @1.0 V Out, 32 Ohms Load: <0.010%
    Intermodulation Distortion Intermodulation Distortion SMTPE/DIN 4:1 50 Hz, 7 kHz
    @1.0 V Out, No Load: <0.008%
    @1.0 V Out, 32 Ohms load: <0.009%
    Frequency Response ± 3dB Fs=96 kHz: 0.5 Hz to 45.9 kHz
    Dynamic Range 20 Hz to 22 kHz Bandwidth: 112 dB
    20 Hz to 22 kHz Bandwidth and A-Weighting Filter: 115 dB
    Output Noise 20 Hz to 22 kHz, Volume = 0-90: -106 dBV
    A-Weighting Filter, Volume = 0-90: -109 dBV
    20 Hz to 22 kHz, Volume = 90.5-99.5: -96 dBV
    A-Weighting Filter, Volume = 90.5-99.5: -98 dBV
    Crosstalk 100 Hz: <107 dB
    1 kHz: <98 dB
    20 kHz: <72 dB
    Attenuation Attenuation Range: 0 to -99 dB, 0.5 dB steps
    Accuracy Channel Tracking Accuracy: ±0.05 dB
    Maximum Output Level Maximum Output Level, No load
    Low Power Mode: +14.1 dBV (5.1 V)
    High Power Mode: +15.5 dBV (6.0 V)
    Impedance Headphone Output: 0.08 Ohms
    Line Output: 47.5 Ohms
    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

    44.1 kHz: 43900-45410 Hz
    48 kHz: 46590-49190 Hz
    88.2 kHz: 87840-90830 Hz
    96 kHz: 93520-97530 Hz

    USB Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz
    Power Consumption Max, High Power Mode: 8.0 W
    Max, Low Power Mode: 2.5 W
    Power Mode Headphone Output Power
    Low Power Mode

    1 Channel Driven
    4 Ohms: 80 mW
    8 Ohms: 140 mW
    16 Ohms: 310 mW
    20 Ohms: 350 mW
    32 Ohms: 600 mW
    50 Ohms: 560 mW
    300 Ohms: 83 mW
    600 Ohms: 40 mW

    2-Channels Driven
    4 Ohms: 22 mW
    8 Ohms: 45 mW
    16 Ohms: 90 mW
    20 Ohms: 100 mW
    32 Ohms: 175 mW
    50 Ohms: 280 mW
    300 Ohms: 83 mW
    600 Ohms: 40 mW

    High Power Mode

    1 Channel Driven
    4 Ohms: 925 mW
    8 Ohms: 1800 mW
    16 Ohms: 1900 mW
    20 Ohms: 1575 mW
    32 Ohms: 1020 mW
    50 Ohms: 680 mW
    300 Ohms: 115 mW
    600 Ohms: 57 mW

    2-Channels Driven
    4 Ohms: 240 mW
    8 Ohms: 490 mW
    16 Ohms: 940 mW
    20 Ohms: 1030 mW
    32 Ohms: 950 mW
    50 Ohms: 650 mW
    300 Ohms: 115 mW
    600 Ohms: 57 mW

    Dimension 4.0 x 5.3 x 1.8" / 101.6 x 133.4 x 45.7 mm
    Weight Not specified by manufacturer
    Packaging Info
    Package Weight 2.5 lb
    Box Dimensions (LxWxH) 10.2 x 10.2 x 4.5"

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