Since purchasing a center channel several weeks ago, I am finding that I am having difficulty understanding dialog. I am using Mirage Omnisat V2 speakers and CC with a Def Tech Sub. The main speakers are set with a crossover of 80 and the CC at 100, all speakers set to small. I didn't seem to have this problem when I was running a 2.1 system. What adjustments do you think I should work with? I've considered buying the Radio Shack SPL meter, but didn't know if it was worth the price of that and a test disk for the very few times they would be used.