Polk Audio PA250.2 2-Channel Bridgeable Power Amplifier 2-channel, stereo, bridge-mono, or simultaneous stereo/mono operation power amplifier Power handling: 90 watts x 2 (2 ohm) continuous power, 125 x 2 (2 ohm) dynamic power, or 250 x 1 (4 ohm) continuous power Double layer fiberglass epoxy printed circuit boards 6-way smart system protection (SSP) circuits High-speed MOSFET switching power supply