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Kramer 903
4x1 Personal Stereo Audio Amplifier & Switcher, 4 ohms


The Kramer 903 is a high performance integrated personal stereo amplifier for unbalanced stereo signals.
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Kramer 903
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The Kramer 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 4 ohm load.


  • Presentation rooms and multimedia applications
  • Any personal audio listening – PC, portable CD player etc.

Kramer 903 Features:

  • S/N Ratio - 68dB (unweighted)
  • Highly Efficient - Class D Operation
  • Inputs - 3 stereo on RCA connectors and a single 3.5mm stereo mini-plug
  • Outputs - 1/4” Headphone jack and terminal block for speakers
  • Control - Volume, bass, mid, treble, balance, and loudness
  • Compact Size - Part of the Kramer TOOLS™ family of compact, high quality and cost effective solutions

Kramer 903 Specifications:

  • Inputs: 1 audio stereo 1Vpp/50kOhm on 3.5mm mini phone connector,3 audio stereo 1Vpp/50kOhm on RCA connectors
  • Outputs: Stereo headphone on a 6.5 mm connector. Loudspeakers on terminal block connector. Automatic switching when a headphone is plugged in
  • Max. Power Output: 25 Watts peak, or 2 x 10 Watts RMS continuous into 4ohms load.
  • Bandwidth (-3dB): 20 kHz
  • S/N Ratio: 77 dB @ 1 kHz
  • Crosstalk: - 73 dB @ 1 kHz, all hostile
  • Controls: Input selector switches, BASS (70 Hz.), MID (1 kHz), TREBLE (15kHz): +/- 13dB.Volume, Balance and Loudness controls.
  • Coupling: AC
  • Audio THD + Noise: 0.5%
  • Audio 2nd Harmonic: 0.3%
  • Power Source: 12 VDC, up to 2.5 Amp
  • Dimensions (WxDxH): 7.5” x 5.3” x 0.98” (19 cm x 13.5 cm x 2.5 cm)
  • Weight: 1.32 lbs. approx (0.6 kg)
  • Accessories: 12 VDC Power supply

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