Model Number: ES-4980-AMP Brand Name: RDING Key Specifications/Special Features: RMS 80W*4CH @ 4OHMRMS 160W*4CH @ 2OHMRMS 320W*2CH @ 4OHM bridgeNickel-plated terminalsSoft start sound, PWM power supplyInput sensitivity: 100mV-6VT.H.D.: <0.05%Variable low pass /subsonic filter: 60Hz-1.2kHzBass boost: 0-12dBSignal-to-noise ratio: >90dBProtection: DC, short, thermal, overloadOptional color: any color for heatsink