DESC: Bring out the detail and clarity of your favorite music with this Infinity 4-channel amp. The variable high-pass and low-pass crossovers keep the right signals flowing to your speakers and subwoofers for the best sound. The MOSFET circuitry passes along plenty of power while remaining cooler and more efficient. Adding it to your car's existing system is easy with speaker-level and pre-amp inputs, and the gold-plated terminals make connecting everything quick and easy.