There are a lot of variables for which can be causing the clipping to happen. Could be gains set to high on the amp, settings jacked up on the H/U, voltage dropping too low, just to name a few off of the top of my head. I tuned my AQ1200D with a DMM, and I don't run into problems. Some songs are louder than others, so I have to turn a few settings down on my H/U so the clipping light goes off. A lot of the songs that I play a decent amount at full tilt I have the H/U settings memorized, so I just turn them down/up right before I put the song on, works perfectly fine for me.