hi, first post here. i've had my 5:1 surround setup for about 3 yrs. now. never had any problems till i switched my Directivo out with Samsung TS360 HD Reciever. it seems to happen only after having changed channels from an HD channel to a regular digital channel, or vice versa. i have it narrowed down to that. and this does not happen every time i switch between HD and regular channels. every other audio source hooked up sounds great. xm radio,dvd,cd,fm radio and analog local cable channels. help! please! my ears can't take this annoyance anymore. 30+ years of loud concerts and louder construction work have taken their toll on my hearing. thanks for any help or advice, love this forum, great rescource!