I didn't know you could "use" THX. It's just a rating.

I did hear that there is some sort of high end roll off (or enhancement, maybe?) specified by the THX standard. None of the other modes use it so maybe this option on your reciever turns that on.

At any rate, I'd only try it when watching a Lucas film. George is THX's "daddy".

M- M60s/VP150/QS8s/SVS PC-Ultra/HK630 Sit down. Shut up. Listen.