Hamblis,
I demo'd exactly what you are doing a couple of years ago. I don't think I knew enough about subs to do it justice then however.
The Stadium was a very cabable unit.
In addition to the very good points made above, I can only add that I think the best result with 5k's was to set them to small and actually take some of the bass music workload to the sub. The 5k's seemed to become more capable in the mids and highs when I did this. I thought this may be even slightly logical as the middle driver is shared as bass/mid.
Placement is critical. If the bass freq's are behaving well in the corner, then, I'd probably leave there. However, test in the centre to be sure. Also, the REL is a big old box so it doesn't score well with WAF if it sits right in the middle of things.
X-over setting will have to be judged by what you like to hear and will be different to , say mine, because of how your room is (mis)behaving. Remember, you can change it on the fly while your fave tunes are playing with the remote.
Cheers
Nick
[This message has been edited by ncpl (edited 01-13-2004).]