The m903 adds new features, with a new volume control, designed to provide higher headroom and lower distortion and noise. “New generation DAC’s and ultra-low noise balanced current to voltage converter yields even more musical performance compared to the m902,” the company says. An improved power supply isolates headphone amplifiers, line amplifiers, DAC’s and digital logic, resulting in lower noise and distortion.
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Another improvement is the new USB interface. This technology is designed to provide an asynchronous data transfer mode which allows for USB playback with zero interface induced jitter. This new interface affords standard driverless USB Class 1 operation on Windows and Mac up to 24bit/96kHz and USB Class 2 audio for 24bit/192kHz operation on Windows and Mac (drivers needed for 192kHz operation under Windows). This is computer-based audiophile playback, perfected.
For more details and full specs, check out Grace Design.
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