No bull Slowhand, I experience this phenomenon pretty often too. In my case, I attribute it simply to "mood". Guys don't typically like to talk about such things, preferring to attribute changes to all sorts of other things such as cables, ICs, vibration, power supply, acoustics, humidity, maybe even the cat in the room, but not simply "mood". Your mood at listening time is just as real and as important-- maybe moreso than all the other physical things we can all come up with-- mood is just as real as any other part of your stereo system. BTW, I've got a CD I like called "Mood Food", by a group called "Mood Swings"-- sort of new agey with prominent, but soft percussion throughout. Just let it happen, and enjoy Slowhand. Another way of putting this is that "some days are better than other days". Ever try to listen when you're seriously ticked off? had a fight with the wife? someone ran over your dog? just got a huge raise at work? have a wicked headache? just got fired? just go laid? Sometimes music can make you feel better, and sometimes worse-- just all depends on the mood of the music gods. But do clean all your ICs, cables etc-- sometimes your system will really sound better, and sometimes you will just feel better about it anyway etc. etc. Cheers. Craig.