besides amplifiers and speakers? i've tried 2 receivers and 2 speakers yet i'm still getting some distortion in the dialogue. the only thing that i haven't tried changing is the source of the signal, which has always been the dvd player since i first noticed it. it's an older sony non-progressive dvd player. with the first receiver i used multi-channel rca audio connections and with the new receiver i used optical and the distortion didn't change. switching the 340 center with a 170 was the same...speaker wire? this is driving me crazy...i keep trying to ignore it but i can't.