Experience premium sound from your car’s audio system with this MX 600W 4-Channel Full Range Class D Sub Compact Amplifier by Phoenix Gold. The MX600.4 features a small footprint chassis design engineered for vehicles with limited space and automotive-grade unregulated power supplies to deliver hard-hitting, articulate bass. This sub-compact 4-channel amplifier also features Audio Precision® Quality Control Verification technology for superior performance.