Polk Audio PA200.4 4-Channel Bridgeable Power Amplifier 4-channel, dual bridge-mono (2-channel) power amplifier Power handling: 35 watts x 4 (2 ohm) continuous power, 80 x 4 (2 ohm) dynamic power, or 100 watts x 2 (4 ohm) continuous power Double layer fiberglass epoxy printed circuit boards 6-way smart system protection (SSP) circuits High-speed MOSFET switching power supply