Polk Audio PA400.1 Monoblock Power Amplifier Monoblock amplifier for subwoofer use Power handling: 400 watts x 1 (1 ohm), 300 watts x 1 (2 ohm) and 200 watts x 1 (4 ohm) continuous power, 800 watts x 1 (1 ohm) dynamic power Double layer fiberglass epoxy printed circuit boards 6-way smart system protection (SSP) circuits High-speed MOSFET switching power supply