JBLMA704 4-CHANNEL MARINE AMPLIFIERS - 1000W•Fully marinized •Compact size•High- and low-level inputs•Selectable Output and Variable Adjustment Crossovers•Conformal-Coated PCB •Includes amplifier stainless steel mounting hardware rubber inserts (4) high-level input adapters (2) spare fuses & (2) 2-color brand stickers•Quick start guide