Class AB with Class D 5th channel ; Marine grade, conformal-coated PC boards to resist corrosion from salt spray & moisture ; ABYC & ASTM certified ; Life Shield badge indicates testing against the elements ; Q-Stasis preamp keeps incoming noise from source units at nearly immeasurable levels, improving quality ; Class SQ & Class Q1 circuitry–the same found in high-end mobile audio units ; Built-in equalization with variable frequency adjustment ; FLUID-FETS technology efficiently produces power & mimic the sound qualityof the highest-end home amps ; Voltage gain: .2V-6V ; Signal-to-noise ratio: >93dB ; Freq resp: 10Hz-45kHz ; Crossover type: Electronic 12dB per octave ; Tone control ; Bass EQ: 0dB-9dB @ 45Hz ; No 1ohm applications ; Dim: 2.2″H x 17.9″W x 9.4″D ; 360W max ; 60W x 4 + 200 x 1 @ 4ohm ; 100W x 4 + 350W x 1 @ 2ohm ;