Kicker CXA360.4 4-Channel AmplifierFlexible and Fun Using Class A B power, this amp features a variable bass boost with KickEQ, giving you as much as a 6dB of extra bump. A powerful 12dB crossover is also included, letting you quickly tune your system to perfection. CX Series Amplifiers accept up to 40 volts (400 watts) of speaker level input signal. This kind of flexibility both makes line out converters unnecessary and optimizes your sound quality at the same time! Highly efficient