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4x1 Personal Stereo Audio Amplifier & Switcher (10 Watts per Channel)


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

Features & Benefits

  • S/N Ratio - 77dB (unweighted).
  • High Efficiency - Class D operation.
  • 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.

Product Use Diagram

Product Specifications

Inputs1 unbalanced stereo audio, 1Vpp/50kΩ on a 3.5mm mini jack; 3 unbalanced stereo audio, 1Vpp/50kΩ on RCA connectors
OutputStereo headphone on a 6.5mm connector; Loudspeakers on a terminal block connector; Automatic switching when headphones are plugged in.
Output Power2x10W (4Ω)
S/N Ratio77dB @1kHz
Crosstalk-73dB @1kHz all hostile
ControlsInput selector switches: bass (70Hz), mid (1kHz), treble (15kHz): +/-13dB; Volume, balance and loudness controls
Audio THD + Noise0.5%
Audio 2nd Harmonic0.3%
Power Consumption12V DC; Up to 2.5A
Output Music Power2x40W (4Ω)
Product Dimensions W, D, H7.38" x 4.53" x 1.00" (18.75cm x 11.50cm x 2.54cm)
Product Weight0.7 lbs (0.3kg)