Kenwood KAC-M1804 Compact 4-channel amplifier — 45 watts RMS x 4 at Crutchfield
Kenwood KAC-M3004 Compact 4 Channel 400W Max Power Amplifier
Amazon.com: KENWOOD KAC-314-4-Channel Concert Series Compact Car Stereo Amplifier with 50W x 4 @ 4ohms, 75W x 4 @ 2ohms, Class D, High/Low-Pass Filters, Variable Bass Boost, 600W Maximum Power : Electronics