... "Factory hem Number:LS555 *Total out power:8Ω 90W 4Ω 180W *Input:4 Microphone *Output:2 Channele A y B *Digital delay ... :-52 dBu *T.H.D.(Rated RMS Power):@120 W,4Ω<1%. *Frequancy response:Mic,input to output 20Hz~20KHz line ... dBu/-35dBu tape -6 dBu *Speaker impedance:4-16Ω *Channel equalization:2-Bands *Output Channel Equalization:7 bands 15 dB 60Hz,160Hz, 1Khz ...