Class AB; Die-cast aluminum-alloy heat sink for optimum dissipation; 2ohm stereo & 4ohm bridged full-range operation; MOSFET power supply with audiophile-grade IRTM transistors; Military-grade SMT PCB maintains dynamic performance; Direct short, thermal & overload circuit protection; Angled wire terminals for secure wire connections; Chassis-integrated aluminum mounting points; Variable 12dB high-pass, low-pass & subsonic crossovers; 200mv-6V low-level RCA inputs; 4-gauge power wire & 8-gauge speaker wire outputs; 12dB bass boost increases low-octave harmonics; 4 channels; 1,800W max; 110W RMS x 4 @ 4ohm ; 225W RMS x 4 @ 2ohm ; 450W RMS x 2 @ 4ohm bridged; Dim: 2.25H x 13.25W x 8.5D;