Reference headphone amplifier, DAC & monitor controller


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The m903 is a headphone amp, DAC and compact monitor controller that features a new volume control for higher headroom and lower distortion and noise, enhanced DAC’s and ultra-low noise balanced current to voltage converter and  improved s-lock PLL circuitry and power supply. It also features a new high speed USB interface that delivers 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).

Both balanced and unbalanced line outputs come as standard, with individual volume controls for each. A mono mode is also provided. A full complement of analog and digital inputs are provided (balanced, unbalanced, AES3, S/PDIF, TOSLINK and USB), which are selectable via a precision rotary front panel switch. An optional m903 Infrared Remote Control is also available.