I was talking to a Polk Audio representative a while back considering a purchase I have since made. He told me, to prevent distortion, I shouldn't turn the volume up past the half-way mark, or 40 out of the max of 80 on my Onkyo TX-SR501. The odd thing is, during calibration, my reference was above 50. And, some music, espeically Classical with a single instrament usually requires 50+. Am I running some sort if a risk? It sounds fine to me, and the receiver has plenty of ventalation. I also have the 3 year warrenty on it.