Grace Design m900 Portable Headphone Amplifier / DAC

Grace DesignSKU: m900

Price:
Sale price €849.00

The m900 is a portable, desktop friendly headphone amplifier / DAC / preamp combo designed to give 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 our large monitor controllers, but in a rugged, portable and surprisingly affordable unit.

The 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 m900 to be the clock master which makes the system immune to USB bus jitter. S/PDIF and Toslink inputs allow the 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 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. Our 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 our DAC and headphone amplifier designs, the m900 distills the best of what we've learned in a compact, rugged and simple unit. Whether in the studio, on your desk or on the road, the m900 will bring you closer to the music you love.

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
  • 5 year transferable Warranty

Reviews:

Mix Magazine by Kevin Becca

TapeOp Magazine by Tom Fine

THD+N 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

 

112dB

20-22kHz bandwidth and A weighting filter

 

115dB

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

 

 

Channel 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

Sample Rate

Lock Range

S/PDIF

44.1kHz

43870-45420Hz

 

48kHz

46590-49220Hz

 

88.2kHz

87760-90830Hz

 

96kHz

93520-98430Hz

 

176.4kHz

175700-181640Hz

 

192kHz

187050-196380Hz

 

 

 

TOSLINK

44.1kHz

43900-45410Hz

 

48kHz

46590-49190Hz

 

88.2kHz

87840-90830Hz

 

96kHz

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

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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