OSD AMP300 Class A/B Toroidal Power High Current 2 Ohms Stable Stereo Bridgeable 350W Amplifier Dual Sourcing and Speaker Level Input 350 Watts per channel peak power, 435 watts Bridged Mono into 8 ohms High Current Class A/B Power Amplifier (2 ohm Stable) High Output Toroidal Power Supply, High Capacitance and Ample Internal Heatsink Three turn on Options: manual On, Music Sensing and 12 Volt Trigger (in/out) Right and Left back panel Gain Controls