Pioneer’s is a Class-D weatherproof 4-channel marine amplifier that is IP67 rated and SAE J1171 Certified. This amplifier features 21-step frequency selection and top adjustment access that benefits when installing into narrow compartments. The microcomputer Protection Control System (PCS) . provides thermal protection . controlled current . and voltage protection to ensure stable output operation. Independent speaker output settings for each channel provide speaker matching flexibility. Pioneer is a Class D Marine Amplifier features an MCU design . utilizing a microprocessor to enable and control the amplifier’s audio . power and protection circuits.