MS-AM504 4-Channel Marine Amplifier - 500W Features: Marine Grade Chassis - Stainless steel end caps and bottom plate provide a stunning finish with added environmental protection. Heat Sink Technology - Heat sink technology transfers heat more efficiently and offers more thermal stability for maximum component reliability. Class-AB Design - The 500 Watt 2-Ohm stable (per channel) design ensures clean and powerful amplification of the input signal,enough to rock the boat. Conformal Coated Circuitry - Provides added protection from salt air and moisture to ensure maximum product life. RCA Line Out - A pass through RCA output enables linking of multiple amplifiers for enhanced system performance. 4 Channels - Capable of powering 4 speakers, a sub and a pair of speakers or 8 speakers in parallel (2 speakers per channel in parellel @ 2 Ohms). WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Specifications: Bridgeable: Yes Channels - Available: 4 Waterproof Rating: Splashproof Watts: 500w Box Dimensions: 4"H x 11"W x 18"L WT: 7.9 lbs UPC: 753759139254 Owner&';s Manual (pdf)