Niles SI-2150 150W 2-Channel Power Amplifier (550W Bridged) Digital, high current bridgeable stereo amplifier 150 watts RMS per channel into 8 Ohms (all channels driven) Channels are bridgeable to 550 watts RMS into 8 Ohms Three turn-on modes: music sense, voltage trigger, and manual Audio circuitry constructed with the finest parts available, including 1% metal film resistors, high quality capacitors and oversized heat sinks for clear and uncolored sound