There are a lot of potential solutions, but the one thing we seem to easily do is forget to look at the most basic first.
Learning about sound is the most fundamental way we can improve our systems... sometimes for free.
Yepimonfire, I both agree and disagree with you... friendly, though!
I prefer the non-symmetrical Geddes-style placement more, as opposed to symmetrical. And my limited understanding is that you want to excite as many room MODES as possible to even out the bass response. That's, at least to my understanding, how you overcome cancellation from standing waves.
If I am wrong, please help me understand better. I came to this forum to learn, afterall.
And for all the cool cats that have helped me, I now want to be able to guide others along the path to audio bliss!
Cheers!