Stereo Audio Amplifier & Switcher (40 Watts per Channel)


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The 908 is a high-performance audio amplifier for line-level stereo audio signals. It accepts either a balanced or an unbalanced stereo audio signal and delivers a speaker output of 40 watts RMS per channel into 8Ω loads.

Features & Benefits

  • Controls - Control knob to adjust volume, bass, middle, treble and balance. Mute and loudness buttons, plus a 10V control port for adjusting the audio gain.
  • USB Port - For firmware update.
  • Flexible Control Options - Front panel, RS-232 (K-Router Windows-based software is included), Ethernet, IR remote (included) and 10KΩ volume level.
  • High Efficiency - Class D operation.

Product Use Diagram

Product Specifications

Inputs1 unbalanced stereo audio on RCA connectors; 1 balanced stereo audio on a 5-pin terminal block connector; 1 USB connector
Output1 speaker stereo audio on a 4-pin terminal block connector
Input SensitivityUnbalanced: 360mVpp; Balanced: 220mVpp
Max Voltage GainUnbalanced: 35dB; Balanced: 40.5dB
Output Power40W per channel into 8Ω
Crosstalk<-57dB @20kHz
ControlsLevel: <-30dB to 35.5dB; Balance: -30dB to 0dB; Loudness: -14dB to 0dB @1kHz; Bass: -15dB to 12dB @100Hz; Mid: -15dB to 11dB @1kHz; Treble: -14dB to 13dB @10kHz; Input selector buttons, mute button, loudness, bass, mid, treble, balance, volume buttons, IR, RS-232, Ethernet, 10V volume control, 1 USB port for upgrading firmware
CouplingInput: AC; Output: DC
Audio THD + Noise0.15%
Audio 2nd Harmonic0.06%
Signal/Noise Ratio63dB; 80dB @10% distortion
Power Consumption24V DC; 2.0A
Product Dimensions W, D, H7.38" x 4.53" x 1.00" (18.75cm x 11.50cm x 2.54cm)
Product Weight1.1 lbs (0.5kg)