KICKER CX400.1 400 Watt Class D Mono Amplifier for Car Audio Speakers, Black Price: $134.96 (as of 04/11/2021 02:17 PST- Details)

CX-Series Mono is an efficient Class-D amplifier for your car
Features a three-second on/off delay to eliminate unwanted interference
Variable 12 dB crossovers let you control the dial to optimize your sound