Hello all. Straight to the point. I run a tonelab le into a stage monitor wharfedale pro evp 12pm. Recently it has been sounding funny when I turn up the distortion on the tonelab, instead of the usual crunch it will perform like a jump back in sound where it sounds muffled. Is it the problems with the dirver, tweets? or the pedal? (but i kinda ruled out the pedal cuz i ran it through other PA it sounds good). If so, where can I get replacement for defective parts or is there anywhere i can service the stage monitors?? thanks