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The 903 is a high-performance integrated personal stereo amplifier for unbalanced stereo signals. It allows selection between four inputs and delivers a speaker output of 10 watts RMS power per channel into a 4ohm load.

  • S/N Ratio - 77dB (unweighted).
  • Highly Efficient - Class D operation.
  • Input - 3 unbalanced stereo audio on RCA connectors and a single 3.5mm mini plug.
  • Output - 6.5mm phone jack and terminal block for speakers.
  • Control - Volume, bass, mid, treble, balance, and loudness.
  • Compact MegaTOOLS® - 2 units can be rack mounted side-by-side in a 1U rack space with the optional RK-T2B rack adapter.


INPUTS: 1 unbalanced stereo audio 1Vpp/50kohm on a 3.5mm mini jack; 3 unbalanced stereo audio 1Vpp/50kohm on RCA connectors.
OUTPUTS: Stereo headphone on a 6.5mm connector; loudspeakers on a terminal block connector; automatic switching when a headphone is plugged in.
OUTPUT POWER: 2x10W (4ohm).
BANDWIDTH (-3dB): 20kHz.
S/N RATIO: 77dB @1kHz.
CROSSTALK: -73dB @1kHz, all hostile.
CONTROLS: Input selector switches: bass (70Hz), mid (1kHz), treble (15kHz): +/-13dB; volume, balance and loudness controls.
POWER SOURCE: 12V DC, up to 2.5A.
DIMENSIONS: 19cm x 13.5cm x 2.5cm (7.5” x 5.3” x 0.98”) W, D, H.
WEIGHT: 0.6kg (1.32lbs) approx.
ACCESSORIES: Power supply.
OPTIONS: RK-T2B 19" rack adapter.

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