I can not remember where I read that all THX approved Amplifiers have the same gain it was probably on these forums somewhere, but I have never confirmed it, can anyone confirm . The reason I ask is that eventually I will upgrade my kit, but I would like to keep the mono-blocks (you may have guessed from other threads I am very keen on them). If the above statement is true I can match them up with other THX kit not just Marantz and they should have the same gain. I know there could be tonality differences but I will cross that bridge whenever. It is looking like it will be a very long time before I can afford to upgrade to something that will give enough performance difference to warrant the change.