Great sound with added power. THX Ultra2 certified 150 watts x 2 into 8 Ω (all channels driven) 225 watts x 2 into 4 Ω or 2 Ω (all channels driven) 400 watts x 1 bridged into 8 Ω or 4 Ω 35 amps peak current per channel 2 Ohm stable operation with load selector switch Two pairs of speaker outputs with front panel A/B buttons Rear-mounted lockout switch disables front A/B buttons High pass filter, switchable for 20Hz or 40Hz Automatic on/off by DC trigger with looping output Automatic on/off by audio signal with 2 sensitivity settings Fully discrete circuitry with high current toroid transformer Bridging switch for stereo or mono operation Efficient, low heat design DC Servo and relay protection circuits Rear-mounted left and right gain controls Standby, channel status and high temperature indicators Gold-plated RCA input jacks Heavy duty 24k gold-plated 5-way speaker terminals 115/230v selector on rear panel 2U rack mount kit available separately (Model RMK22)