I figured it was something like that, like Yamaha set it up so I couldn't make my center channel too brassy. Speech sounded okay through it for the most part, but unfortunately there are other sounds that come through the center channel besides the human voice. When a sound went, for example, left, center, right, it always seemed to fade off when it hit the center. It was never a setting on the EQ or the gain. I spent hours making sure they were set as accurately as can be.
I went through my manual and menus on the Yamaha at least 5x thinking there was some sort of setting I was missing. Unfortunatley there was NO setting to be had on mine, it was factory preset and I could do nothing to change it (well, except sell it and get my Pioneer). Thats pretty poor engineering in my book. It's left such a bad taste in my mouth I swore I'd never buy another Yamaha again!
In the end all that matters is the Klipsch speakers now sound great together and I've got a solid foundation to build an amazing system around!