Class-D Mono-block Subwoofer Amplifier, 2500 Watts Max Power, RMS 1250 Watts x 1@1 Ohm; RMS 900 Watts x 1@2Ohm; RMS 550 Watts x 1@4Ohm. Recoil mono amplifiers are stable down to one Ohm, giving you the freedom to put even more subs in your system.