APEX PA454 4 Channel Amplifier 45W x 4Designed to excel in extreme conditions (Waterproof, Dustproof, Freezeproof) these amps will thrive in the all weather. These amps are a game changer from their small size, robust power output, and pricing.  Suitable for small compact places, these amps will thrive in golf carts, side by sides, snowmobiles, motorcycles, and small water crafts (flats boats, tenders, jet skis, fresh and saltwater aluminum and fiberglass boats) among other applications.Features:RMS Power: 45Wx4@4-ohmSelectable CrossoverFront/Rear: High-Pass @ Full/60/80/120HzFrequency Response: 20Hz to 20kHzSignal to Noise Ratio: 85dBTHD: Fuse Rating: 15ADimensions: 170mm x 85mm x 45mm