Russound X125 2-Channel Dual Source Amplifier Selects 11 steps of volume plus power off Configurable - Allows impedance matching for up to 16 speaker pairs per system Precision autoformers assure long life and superior performance Power handling - 126 watts peak, 42 watts RMS continuous per channel Frequency response - 20 Hz - 20 kHz, +1.0/-0.5 dB at rated power