Rockville DBM45 2000 Watt Class-AB 4 channel Marine amplifier with terminal covers. Ceca compliant Power Ratings: . 2 Ohm: 125 Watts x 4 channel. 4 Ohm: 85 Watts x 4 channel. 4 Ohm Bridged: 250 watts x 2 channel. Rms Power Ratings: . 2 Ohm: 250 Watts x 4 channel. 4 Ohm: 170 Watts x 4 channel. 4 Ohm Bridged: 500 watts x 2 channel. Peak power ratings: . 2 Ohm: 500 Watts x 4 channel. 4 Ohm: 340 Watts x 4 channel. 4 Ohm Bridged: 1000 watts x 2 channel. Painted conformal coating PCB board (uses 2577 waterproof glue). waterproof silicone covers for end panels. Rustproof aluminum heat sink with white painted finish. Stainless steel end panels are rustproof. All screws and mounting hardware are stainless steel and rustproof. Bottom panel is aluminum and rustproof. All channels on the amp have crossovers so they can each be used for subs or full range speakers or tweeters or midrange speakers. All channels on the amplifier are bridgeable. Fully adjustable 12dB/ Octave Crossover with differential circuitry. Adjustable subsonic filter: 15Hz -40Hz (This filter is on the HPF knob). adjustable low pass filter: 40Hz – 4Khz. Adjustable band pass filter: 15 Hz - 4 kHz (use both the HPF and LPF filter). adjustable high pass（ subsonic） filter: 15 Hz - 4 kHz (use both the HPF and LPF filter). fully adjustable 12dB bass equalizer. 2Ch/4Ch input mode switch. Status mode LED indicator. Adjustable input level control. Mute and delay soft start system. Minimum THD at rated power: 90 dB. Frequency response: 10 Hz - 50 kHz. Damping factor: >85 @ 100Hz. (2) 35 amp ATC fuses. High-speed MOSFET power supply. Studio-grade BIPOLAR Output stage transistors. 8 volt Preamp circuitry. 35 amp x2 ATC fuse. Microphone input and PA Microphone included. Product dimensions (w x H x L): 9˝ x 2. 4˝ x 15. 1˝ inches. Product weight: 7. 7 lbs