The PA D1000.1 is Polk Audio"s new high-efficient digital monoblock amplifier. This amplifier is able to power handle at 4 ohms, 2 ohms, and even 1 ohm. With this many different ohm ratings this monoblock amplifier is sure to fit any application or installation that you are seeking. Anything from mid-level subwoofers at the 4 ohm rating to high-end heavy bass hitting subwoofers at the 1 ohm rating.