Class AB ; 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 immeasurablelevels, 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 quality of 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 17.01″W x 9.4″D ; 540W max ; 60W x 6 @ 4ohm ; 100W x 6 @ 2ohm ; 200W x 3 @ 4ohm bridged ; Channels 1-6 crossover freq range: High pass 250Hz-4kHz; Low pass 40Hz-250Hz;