The sound in my home cinema has always troubled me a little bit, for most of the time it sounded pretty good, although I always tended to keep the volume way below reference levels, if I went too high the sound or volume became a bit unbearable. Sometimes without any particular reason it would sound plain awful at any volume. Over the last 9 months or so I've made a few alterations to the setup, calibrated using an SPL, bought a good sub and some decent power cables. I have also made changes to the room which would effect acoustics. Quite recently I've been happy with the way the system has been sounding so when the wife went out shopping yesterday I took the opportunity to crank up the volume and it sounded great, no problems at all. It just goes to show that tweaks do work but sometimes it can take a while for it all to settle in.