I have a THX Ultra certified processor (Tag AV32R) and a THX Ultra 2 power amp (Arcam FMJ P7). When I try to access THX post processing on my Tag I feel it sounds worse than normal Dolby Digital / DTS and certainly different. Is this because my speakers are not THX certified or does everything from cables to DVD player/ DVD disc/ processor/ amp have to be THX certified to get the benefit? I first thought it would be great to have THX badges but now I feel let down. I know that THX is a set of standards laid down by Lucas and that more expensive av equipment have these THX badges. They have to pay Lucas a licence.