Class AB; Bridgeable; Variable input voltage; QTD (Quick Thermal Dispersion) technology heat sink; Low-noise preamp; High-level inputs; Low-level RCA inputs & outputs; 2- & 3-channel operation modes; Built-in variable electronic crossover (HP & LP); Onboard bass boost; Easily ties into OEM audio systems; 4,000W max; 500W RMS x 4 @ 4ohm ; 1,000W RMS x 4 @ 2ohm ; 2,000W RMS x 2 @ 4ohm bridged; Dim: 3.8″H x 21″W x 11.4″D;