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.