The versatile R750-1D puts out 250 watts RMS to a 4-ohm sub, but will crank out 750 watts RMS when it's running a 1-ohm subwoofer setup. mono subwoofer amplifier. Class-D amplifier design. 250 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms).
eBay