what's the volume you playing at? is the input too high? (output from your soundcard/ windows volume/application volume both at max?) edic is a protection measure which will trigger to protect the components from overload or damage from clipping (distortion aka square wave formation scenario)

i see... is it same for all sources? try another source like mp3 player or the low level input? (RCA in)? and connections ok? if all those still same, i guess it's problem with the amp.

had a few friends with the problem... 1 guy volume output high (100/full at windows) and volume on speaker high. another is problem with the 3.5mm input, after switch to RCA problem gone. and another dude amp problem, sent for repair =\ wanted to get C3 but it seems like the recent batch built quality got problem... hav seen quite a number of issues on lyn with this eidc thing