Hey guys, sorry if in wrong section. I have a current problem with our behringer ep4000 sub amp. Channel 1 seems to be clipping like crazy with distortion when a moderately low signal is sent to it. It only clips when a speaker is plugged in. No speaker connected and it doesn't clip. Normal yellow likes come on. Channel 2 runs perfect with and without speaker connected. No clipping whats so ever. Chan 1 clips with and without clip limiter engaged. I am also running same signal source to both channels in parallel input mode. I also tried stereo mode but same conclusion. Ch1 clips, ch2 perfect. What could it be? I checked inside and gave a fresh slight coat solder on speaker board. Not sure where else to look. Thanks, C.B.