Waterproof four-channel, bridgeable MOSFET power amplifier with 4 x 250 Watts maximum output.Variable high- and low-pass filters with crossover mode selector.High-level MOLEX and gold-plated low-level RCA inputs with adjustable input level.Overload, Short Circuit, and Thermal protection with LED indicator.Variable bass boost of up to 18dB at 60Hz This Pyle Hydra amp will power your speakers on the dock, in your boat, or by the pool – it’s completely waterproof. This 4-channel, 1000-watt bridgeable marine amp takes both high and low level inputs, so it’s compatible with a variety of head units and sources. Use in stereo, or double the power by bridging inputs. Comes with variable electronic crossover network, variable bass boost, and variable gain control for total control over your sound. Blue LED level display lets you keep an eye on your signal. For protection, count on the thermal, overload, and short circuit protection. Runs on 12 volts DC.