Get the most out of your sound with the Kicker CX400.1 Amplifier for Car Audio Speakers.CX-Series Mono Amps are ohm stable, giving you even more power and wiring options for your system. A powerful 12 dB crossover and 24 dB subsonic filter are included, letting you quickly tune your system to perfection. Use the full-range outputs to expand your system with other bass amps, or a full-range amp to complete your system.CX.1 Amplifiers accept up to 40 volts of speaker-level input signal. This kind of flexibility makes line-out converters unnecessary and optimizes your sound quality.