Grace Design m903 - Pro Audio Headphone Amp / DAC w/ remote

Description

Grace Designs m903 - Pro Audio Headphone Amp / DAC w/ remote.
Unit is used, but in excellent working order.   Very minor cosmetic blemishes.  Used primarily as DAC / headphone amp in a home audio system.   Non-smoking household.   Includes remote (5 direct from Grace).
m903 Key Features
Stereo analog inputs - balanced (+4dBu) XLR and unbalanced (-10dBv) RCA.
Ultra low distortion 24-bit /192khz DAC accepts stereo digital input sources in AES3, S/PDIF, TOSLINK (optical) and USB for- mats with auto sample rate detection and digital de-emphasis filter.
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dual stage PLL (phase lock loop) circuitry for the ultimate in low jitter clocking and sonic integrity.
Two sets of line level outputs provided via RCA and 1⁄4 TRS jacks for connection to stereo monitors.
Front panel rotary encoder provides precision level control of both headphone and the line output levels. Level adjustments are made in 0.5dB steps within a 95dB range.
0.05dB channel level matching to ensure true stereo balance at any monitoring level.
Large, white 7-segment display is used to show headphone and stereo main output levels.
X-feed (crossfeed) simulates the acoustics of a loudspeaker listening environment which can significantly improve imaging while reducing listening fatigue when using headphones. This feature employs carefully designed signal cross-feed, filtering and delay circuits to simulate hrtf (head related transfer functions).
High current transimpedance output amplifier design drives 8 ohm loads. The m903 was specifically designed with low im- pedance headphones in mind.
Only the highest quality 0.5% metal film resistors are used throughout and there are no electrolytic capacitors in the signal path. Sealed gold contact relays are used for all signal switching.
Infrared remote control for level control, left/right balance, mute and more when using the optional remote control unit.
Manual can be viewed/downloaded here: https://www.gracedesign.com/support/m903_manual_RevA.pdf