but how easy or complex is it to get into THX. I've got a Denon AVCA1 (upgraded from tomorrow) and a dedicated room with Panny PJ. Currently have ES set-up with all main speakers bi-wired and a RelQ150 sub.. Is THX a worthy upgrade, what does it involve.? As in is it simply a case of changing speakers. I am a real virgin when it comes to THX so please be gentle. I have some DVDs that say THX on the box so that's a start surely.. (that bit was a joke by the way)..