I'm noticing more and more movies on HBO and other Premium channels are distorting on loud scenes with Dolby Digital. I'm using a HR21 with Optical Out to my Yamaha amp and the problem seems to be getting worse and worse. Anybody else hearing this? I don't believe it's the amp or speakers. The amp is fine with Blu-Ray content, the speakers (Kef) too. Also the distortion/clipping seems to affect at least the front 3 channels (i'm not hearing it from the rears). I wonder if its related to compression, causing the sound to clip?