JBL CLUB A754 High performance Class-H 4 Channel Speaker Subwoofer Amplifier

You can also bridge the amp to 2-channel mode to drive a couple subs with 200 watts RMS or 3-channel mode to drive both a pair of full range speakers and a subwoofer. Speaker-level inputs allow this amplifier to integrate into almost any system, even one using your car's factory radio.

eBay