Technical Specifications RNS 8Ω/STEREO:1400W+1400W 20Hz-20KHz 4Ω/STEREO:2000W+2000W THD+N 0.1% 8Ω/BRIDGE:4000W Frequency Response 20Hz-20KHz: ±0.5dB THD+N: < 0.1% SNR: 100dB Damping Factor: >200 SR: >20V/μs Gain RL 8Ω: 43dB Input Impedance: balance 20K / unbalance 10K Output Circuitry :3-tier Class H AC Power :AC220V / 50Hz±10% Amplifier and Load Protection :Soft boot, DC, short circuit, overload, overheat, Clipping distortion Input CONNECTORS :Female XLR Type/ Male XLR Type Output CONNECTORS :NL4 Speakon socket, Binding post Controls and LEDs—Front Panel:Peak clipping, Signal, A&B Volume potentiometers, DC, Protection indicator Controls and LEDs—Rear Panel:Stereo, Splice, Bridging option switch, Bridging indicator, Sensitivity option switch, Grounding switch,30Hz HI-PASS switch. Cooling mode: Stepless automatic transmission cooling fan.