Boss NX2500.4 Onyx 2500 Watt 4-Channel Mosfet Bridgeable Amplifier with Remote Four-channel Onyx amplifier with MOSFET power supply and trimode operation Delivers 625 Watts x 4 at 2 ohms; 250 Watts x 4 at 4 ohms; 1250 Watts x 2 bridged Line and speaker level inputs with variable gain control Built-in low- and high-pass variable crossovers; 18dB bass boost Includes remote subwoofer level control