Grace Design m900 Headphone Amplifier

Grace Design

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Product Code: 9999-05995
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$660.00 $595.00
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The Grace Design m900 Headphone Amplifier is a portable, desktop friendly headphone amplifier, DAC, Preamp combo designed to give audio professionals and enthusiasts musical and transparent audio playback.

The Grace Design m900 Headphone Amplifier is a compact, portable headphone Amp / DAC / Preamp. For small DAW studio setups, portable laptop editing or mixing rigs, or just pure playback enjoyment, the Grace Design m900 provides the same analog and DAC quality as their large monitor controllers, but in a rugged, portable and surprisingly affordable unit.

The Grace Design m900 DAC uses the latest generation AKM 4490 chip, which features 32-bit processing and supports sample rates up to 384kHz PCM or 256x DSD. The USB interface operates in asynchronous mode allowing the Grace Design m900 to be the clock master which makes the system immune to USB bus jitter. S/PDIF and Toslink inputs allow the Grace Design m900 to enhance to any DAW interface with true reference quality D/A conversion, headphone monitoring and stereo speaker control An intelligent power supply design allows for two power operation modes – LOW and HIGH. LOW power mode is from USB connector #1, which provides bus power along with data, allowing the Grace Design m900 to operate from a single connection to your computer. HIGH power power mode is available by connecting the included 2A USB DC power supply to the USB connector #2, which provides additional power for harder to drive headphones. Transimpedance amplifier topology coupled to a zero ohm output impedance driver provides headphone performance that is incredibly spacious and transparent with a tight, enveloping low end. Grace Design's latest generation crossfeed circuit rounds out the design by simulating an acoustic listening environment in the headphones. Familiar tracks become new again with surprise details, while audio production tasks like tracking, mixing and editing happen faster and easier.

After many years of honing Grace Design's DAC and headphone amplifier designs, the Grace Design m900 distills the best of what you’ve learned in a compact, rugged and simple unit. Whether in the studio, on your desk or on the road, the Grace Design m900 will bring you closer to the music you love.

Grace Design m900 Headphone Amplifier Power Modes

  • Low Power, USB Input – One USB cable from the computer to the m900 #1 USB input. Grace Design m900 receives power and audio from the computer.
  • High Power, USB Input – One USB cable from the computer to the m900 #1 USB input and one USB cable from the external 2A DC power supply to the m900 #2 high power DC input connector. The Grace Design m900 receives audio from the computer and receives power from the external DC supply.
  • Low Power, S/PDIF or TOSLINK Input – One USB cable from a standard USB power source (computer or 0.5A USB power supply) connected to the m900 #1 USB input. TOSLINK or S/PDIF input connected. (This would be an unusual setup where you don’t have access to a high power DC power supply.)
  • High Power, S/PDIF or TOSLINK Input – One USB cable from the 2A DC power supply to the m900 #2 high power DC input connector. TOSLINK or S/PDIF input connected. Grace Design m900 receives audio from TOSLINK and power from the external DC supply.
  • Self Powered Mode – This mode is for connecting your mobile device (iOS, android) to the Grace Design m900. Mobile devices generally cannot provide any power. In this mode the Grace Design m900 will report that it is self powered. To enter self powered mode, first connect the USB cable from the external 2A DC power supply to the m900 #2 high power DC input connector, then connect your device to the m900 #1 USB input. For iOS, you will need the ‘Apple Lightning to USB Camera Adapter’, for supported Android devices you will need an ‘On The Go’ USB cable.

Grace Design m900 Headphone Amplifier Features

  • USB, S/PDIF and Toslink digital inputs, supports up to 192kHz (Toslink up to 96kHz)
  • Asynchronous USB interface for jitter free computer audio playback, supports up to 384kHz 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
  • Mono mode, Left minus Right mode
  • 6 Monitoring modes: stereo, L&R swapped, left in both channels, right in both channels, left channel only, right channel only
  • Channel balance adjustment
  • 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

Grace Design m900 Headphone Amplifier Specifications

  • THD+N at Maximum Volume, 1kHz, 22Hz-22kHz BW:
    • @1.0V Out, No Load: <0.002%
    • @1.0V Out, 32 Ohm Load: <0.010%
  • 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:
    • 20-22kHz Bandwidth: 112 dB
    • 20-22kHz Bandwidth & A weighting Filter: 115 dB
  • Output Noise:
    • 20-22kHz, Volume=0-90: -106dBV
    • A Weighting Filter, Volume = 0-90: -109dBV
    • 20-22kHz, 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
  • Crosstalk Tracking Accuracy: +/-0.05dB
  • 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:
    • S/PDIF: Sample Rate: 44.1kHz, Lock Range: 43870-45420Hz
    • S/PDIF: Sample Rate: 48kHz, Lock Range: 46590-49220Hz
    • S/PDIF: Sample Rate: 88.2kHz, Lock Range: 87760-90830Hz
    • S/PDIF: Sample Rate: 96kHz, Lock Range: 93520-98430Hz
    • S/PDIF: Sample Rate: 176.4kHz, Lock Range: 175700-181640Hz
    • S/PDIF: Sample Rate: 192kHz, Lock Range: 187050-196380Hz
    • TOSLINK: Sample Rate: 44.1kHz, Lock Range: 43900-45410Hz
    • 60Hz: Sample Rate: 48kHz, Lock Range: 46590-49190Hz
    • 60Hz: Sample Rate: 88.2kHz, Lock Range: 87840-90830Hz
    • 60Hz: Sample Rate: 96kHz, Lock Range: 93520-97530Hz
    • USB Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384kHz
  • 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:
    • S/PDILoad Resistance 4 Ohms: 1 Channel Driven; Output Power 80mW, 2 Channels Driven; Output Power 22mW
    • S/PDILoad Resistance 8 Ohms: 1 Channel Driven; Output Power 140mW, 2 Channels Driven; Output Power 45mW
    • S/PDILoad Resistance 16 Ohms: 1 Channel Driven; Output Power 310mW, 2 Channels Driven; Output Power 90mW
    • S/PDILoad Resistance 20 Ohms: 1 Channel Driven; Output Power 350mW, 2 Channels Driven; Output Power 100mW
    • S/PDILoad Resistance 32 Ohms: 1 Channel Driven; Output Power 600mW, 2 Channels Driven; Output Power 175mW
    • S/PDILoad Resistance 50 Ohms: 1 Channel Driven; Output Power 560mW, 2 Channels Driven; Output Power 280mW
    • S/PDILoad Resistance 300 Ohms: 1 Channel Driven; Output Power 83mW, 2 Channels Driven; Output Power 83mW
    • S/PDILoad Resistance 600 Ohms: 1 Channel Driven; Output Power 40mW, 2 Channels Driven; Output Power 40mW
  • Headphone Output Power / High Power Mode:
    • S/PDILoad Resistance 4 Ohms: 1 Channel Driven; Output Power 925mW, 2 Channels Driven; Output Power 240mW
    • S/PDILoad Resistance 8 Ohms: 1 Channel Driven; Output Power 1800mW, 2 Channels Driven; Output Power 490mW
    • S/PDILoad Resistance 16 Ohms: 1 Channel Driven; Output Power 1900mW, 2 Channels Driven; Output Power 940mW
    • S/PDILoad Resistance 20 Ohms: 1 Channel Driven; Output Power 1575mW, 2 Channels Driven; Output Power 1030mW
    • S/PDILoad Resistance 32 Ohms: 1 Channel Driven; Output Power 1020mW, 2 Channels Driven; Output Power 950mW
    • S/PDILoad Resistance 50 Ohms: 1 Channel Driven; Output Power 680mW, 2 Channels Driven; Output Power 650mW
    • S/PDILoad Resistance 300 Ohms: 1 Channel Driven; Output Power 115mW, 2 Channels Driven; Output Power 115mW
    • S/PDILoad Resistance 600 Ohms: 1 Channel Driven; Output Power 57mW, 2 Channels Driven; Output Power 57mW

Grace Design m900 Headphone Amplifier Includes

  • Grace Design m900 Headphone Amplifier
  • Owners Manual
  • 5 Year Warranty

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On Orders over $99 in Lower 48 States

Shipping is expensive thats why Front End Audio has made it easy for you to ship your orders for free. Qualified orders of $99 or more enjoy free shipping in the lower 48.! It doesnt get much easier that that!

There are some exclusions so check out our Shipping Policy page in the Customer Service section at the bottom of the page.

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