Hi fellows, Here's what's been bothering me for quite a while. I'm running following setup: Nakamichi AV-10 receiver with a pair of B&W bookshelves (602 S3), can't remember what SS rears (in-ceiling), Adire Rava sub, and NAD DVD player. It all sounds very, very decent, including surround sound while watching videos. The problem starts when I crank up the volume listening to the audio CDs (primarily when we have guests and want to dance). All of a sudden the sound quality degrades and it feels like mid range starts dominating. It is either good quality at the usual listening volume (sorry, I would not know the dB level but this is what would anyone listen in the middle of the day) or dismal sound at a club sound level ( I don't think I turn the knob on AV-10 past the middle). My question is where this problem comes from? Do I need pre-amp or anything else or this is speakers, which I don't think it is since there is no distortion coming from them.