Isn't that sort of the idea, though? I thought you weren't really supposed to actively 'notice' the mix that's being sent to the surrounds? (...at least with Home Theatre. Surround setup for audio is a whole different beast, from what I can tell...) Anyway, it seems pretty common for people to turn up the surrounds, rears and subs (!) a bit more than they should in order to emphasize the fact that they have them.