I have a 3802 with B&W LCR6S2 for the centre. I've been noticing distortion at certain peaks of dialogue, in particular when someone is yelling. I spoke to someone from the store and he said the channel's set too high. I've lowered the channel vol. and still the same thing. All my speakers have been set with a sound meter so it shouldn't be volume. Any ideas what to do? Is it possible the speakers damaged?