I struggle with this issue. I have a bigscreen TV, but it's not massive. It's a slightly older 4:3 53" Sony. With the speakers off on the corner, providing a wide sound stage, sounds just aren't placed right. I feel like there's a huge hole between just off screen where positional audio would be directed at the individual speaker and where the sound is coming from. It seems thrown. However, with the speakers closer to the TV, the room just isn't enveloped.
So far, the only solution I've been able to come up with is a projector and a massive screen... :/
