... and speaker is connected by speciall four-core line ModelPA1202PA1502Rated Output Power Continuous Average Power ... ~20KHz,8Ω load,A-weighted>102dBInput CMRR(common moderejection ratio) @ 1KHz>79dBChannel separation(Crosstalk)@ ... rear air flowLED Indicators Front panelPower-ON,Mode,Clip/Limit,Signal,ProtectionLED Indicators Rear ... POWERCON jacks,one is for CH1 and CH2, the other is for CH3 and CH4Modes ...