Pyle Hydra Marine Amplifier - Upgraded Elite Series 1000 Watt 4 Channel Bridgeable Amp Tri-Mode Configurable, Waterproof,  MOSFET Power Supply, GAIN Level Controls and RCA Stereo Input(PLMRA420) 4 CHANNEL BRIDGEABLE AMPLIFIER: Pyles PLMRA420 is engineered as a 4 Channel bridgeable marine amplifier that powers up your speaker and is universally compatible. It also has high and low electronic crossover network or pass filters. PREMIUM RCA INPUT: For an easier use of this hydra marine amplifier, it comes with premium RCA inputs. If your marine receiver lacks RCA output jacks, you can connect speaker output leads to the high-level inputs. SHORT PROTECTION: Built with a heavy duty Aluminum Alloy heatsink, thermal overload speaker short protection and LED light indicator. These are to protect the amp and your vehicle's electrical system from short circuit conditions. POWERFUL 1000 WATT: This amplifier is powerful with its 1000 WATT maximum and dual MOFSET power supply. Comes with dual adjustable input GAIN level controls of 10k Ohm (Low) and 100 Ohm (High) speaker impedance. MARINE GRADE: With its Marine rating of IP-01, it is waterproof ready. Its constructed with gold-plated speaker output terminal connectors as well to combat corrosion with long term use. 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