I always read that when you are setting up your speakers you need to make sure they are "timbre-matched." I would guess that one way to do this is by buying the same brand for all of your speakers and sub. But I notice that many of you have various brands in your HT...how do you make sure that it is all "timbre-matched"? It is a matter of just calibrating the system with something like Avia and a SPL? I'm asking because I want to replace my HT a piece at a time and it would be helpful to understand what to look for if I choose to mix and match. Thanks.