AudioSource Amp 300 High-Current Stereo Amplifier (150 Watts x 2) (Discontinued by Manufacturer) 150 watts RMS x 2 (into 8 ohms); 470 watts RMS x 1 (into 8 ohms) with bridged mono use A/B speaker selector allows multi-room amplification; uses low-distortion toroidal power supply Signal-sensing auto-on/off and 12-volt trigger ports (in and out) for custom configuration High- and low-level inputs for maximum flexibility Measures 16.5 x 5.3 x 14 inches (W x H x D)