The Center Channel is key for HT. Phantom Center is a bad choice BTW. Anyway, the advice on timbre matching is good. Heres my take;
1. Tweeters should be equal height across mains and center and ear level is not a bad thing either. Ideally, centers and mains should have identical drivers as well. Often the center will have two mid drivers and a tweeter but whatever.
When setting up the mains and center, you really should be able to have a seamless transition of sound as , for example, that helicopter flies across the screen. No holes or dropoffs. I have found that setting up speakers for HT is a different game than 2 channel.
Have fun.
1. Tweeters should be equal height across mains and center and ear level is not a bad thing either. Ideally, centers and mains should have identical drivers as well. Often the center will have two mid drivers and a tweeter but whatever.
When setting up the mains and center, you really should be able to have a seamless transition of sound as , for example, that helicopter flies across the screen. No holes or dropoffs. I have found that setting up speakers for HT is a different game than 2 channel.
Have fun.