I was planning to buy and use this, but I'm selling it because I no longer need it. It's new, unused, and the box is unopened. 【Specifications】 ◎Total Harmonic Distortion • Less than 0.1% / 2Ω 4Ω 8Ω • 1% / 70V 100V ◎Mono Mode • 500W / 2Ω • 500W / 4Ω • 300W / 8Ω - / 70V - / 100V ◎V-Bridge Mode • 500W* / 2Ω • 1000W / 4Ω • 1000W / 8Ω • 800W / 70V • 1000W / 100V ◎I-Share Mode • 1000W / 2Ω • 500W* / 4Ω • 300W* / 8Ω - / 70V - / 100V ◎Quad Mode • 1000W* / 2Ω • 2000W / 4Ω • 1000W* / 8Ω • 1600W / 70V • 2000W / 100V *Reference value (not recommended) ◎Maximum Output 4000W (500W x 8ch, 4Ω) ◎Maximum Peak Voltage 71 / 142 V (Mono / V-Bridge / I-Share / Quad mode) 《Audio Performance》 ◎Frequency Response 20 Hz - 20 kHz (@1W, ±0.5dB) ◎S/N Ratio 102 dBA or more (Rated -1dB, A-weighted) ◎Total Harmonic Distortion Less than 0.4% (@1W, 20 Hz-20 kHz) ◎Intermodulation Distortion - SMPTE Less than 0.4% (60 Hz, 7 kHz) ◎Channel Separation (Crosstalk) 65 dB or more (1 kHz) ◎Damping Factor 1000 or more (10-1000 Hz, 4Ω, output stage) 《Other Specifications》 ◎Setup/Configuration Software ControlSpace V3.2 or later ◎PC Connection Terminal USB (Ethernet RJ45 equipped for network-compatible models) ◎Fault Notification Output (GPIO) NC/NO Relay Contact (1A, 30VDC), 3-pin Phoenix Contact terminal (orange, part # 1976010) ◎Rack Size 2 RU ◎Cooling System Microprocessor-controlled, variable-speed fan, front-to-back ventilation ◎Operating Temperature Range 0°C - 40°C ◎External Dimensions 483(W) X 88(H) X 525(D) mm ◎Weight 12.9 kg