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  Grace Design m903 Headphone Amp

Grace Design m903 Headphone Amp


 
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Product Code: M903
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Description
 
The M903 is a new improved headphone amp by Grace Design.

The m903 is a stereo reference headphone amp, Digital Audio Converter, and stereo monitor controller housed in a half rack space size. The m903 has been designed to provide audio pros in music, post and live-sound with fantastic headphone as well as stereo mains monitoring, whether from an analog or digital stereo source. It also serves the audiophile market as a reference quality Digital Audio Conversion and system preamp. The m903 provides balanced and unbalanced stereo analog inputs via rear panel XLR and RCA jacks. Both plus 4dBu and  minus10dBV analog sources are accommodated. A pair of front panel, parallel-wired 1/4" TRS outputs are included to allow two headphone pairs to be used simultaneously. The m903 also adds two pair of line outputs ( balanced and unbalanced ) on the rear panel, allowing the system to perform as a high-end monitor controller and system preamp. Each pair of line outputs may be level controlled separately. The m903 employs high current output amplifiers optimized for driving even the lowest impedance headphones. A front panel rotary encoder provides precision level control of both headphone and line output levels and level adjustments are made in 0.5 dB steps within a 95dB range. AES3, S/PDIF and optical digital sources are accepted via rear-panel XLR, RCA and TOSLINK connectors respectively. As an added convenience, a USB input is supplied for users who require a reference quality listening experience while connected to their computer. A front panel rotary switch selects between analog and digital sources, and a 4 LED array is provided to show valid digital source sample rates between 44.1 and 192kHz. A next generation, high performance 24-bit Digital Audio Converter or DAC, which includes Grace’s unique s-Lock TM dual stage PLL, (Phase Lock Loop) is utilized for conversion and provides stunning results with extremely low intrinsic jitter. Get yours today at the best possible price from RMC Audio Direct.

Product Features



  • Next generation DAC and ultra low noise balanced current-to-voltage converter yields more musical performance, with a nearly 10dB improvement in dynamic range
  • New high speed, ground isolated USB interface with a completely asynchronous transfer mode that provides bit-perfect playback with zero interface induced jitter. Driverless operation on Mac OS machines up to 24-bit/192kHz. Windows machines require drivers for 192kHz operation.
  • New volume control which has higher headroom and lower distortion and noise
  • Improved headphone output protection circuitry and a gold contact relay for eliminating pops and clicks during power cycles
  • Balanced and unbalanced line outputs with individual level control for each
  • Improved s-Lock PLL circuitry has lower phase noise and jitter
  • Improved X-feed circuit eliminates perceived low frequency content loss
  • improved power supply architecture isolates headphone power amplifiers, line amplifiers, DACs and digital logic

Recommended Accessories for this product...
Grace Design m903RCU Remote Control Unit for M903
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Grace Design m903RCU Remote Control Unit for M903


Average Customer Review: 5 of 5 | Total Reviews: 2  Write a review.

  0 of 0 people found the following review helpful:
 
Grace Design m903 - WOW! August 18, 2011
Reviewer: denydog from Pacific Northwest USA  
I bought the m903 last week as an upgrade from my two year old m902.  It was well worth it for the updated DAC chip and greatly improved USB input, among other things.  

Nothing was going to tempt me away from the m902, and then they announced the m903.  I'm very happy that I made the switch! The sound is noticeably improved.

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  0 of 0 people found the following review helpful:
 
M903 March 2, 2011
Reviewer: Rodrick Chassot from New Iberia , LA United States  
clearly, a step up from the 902; now, if i can just get the remote in a more timely fashsion.....

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