Eton SDA 100.4 Digital 4 Channel Amplifier Specifications 4OHM  75 Watts x 4 2OHM  110 Watts x 4 4OHM  220 Watts x 2 Battery Fuse Rating (Amp)  40A Crossover Slope   12dB/octave Butterworth Crossover Frequency:  50Hz - 500Hz and 500Hz - 5000Hz Frequency Response: 20Hz - 20kHz ±1dB Signal Voltage Adjustment Range:  300mV to 8V (RCA Input) Protection Short circuit:  Shortcut speaker outup, thermal protection Operating Voltage:  7,6 - 15,6 Volts DC High Level in, Auto On start/stop automatic Damping Factor  >200 THD+N (Total Harmonic Distortion + Noise) < 0.2% @ 4 ohm Dimensions  5,50cm x 17,3cm x 23,1cm