A few questions/suggestions:
(1) Is you rear row of seats really up against the back wall like that? Will make it very difficult to do rear back surround speakers effectively. You won't get any real surround effects in those two seats in the corner. If no one will ever seat there, less of an issue.
(2) Those subs need a lot of EQ to even reach 20hz.
(3) You need to ensure that 15 feet back is sufficient for those speakers since the drivers are so far apart.
(4) I love overkill as much as the next guy but I would probably step down to the 4722n for mains in that size room and spend the difference on more subs. I don't think you could even really tolerate enough loudness to tell the differences between the two in your room. 4722n would also require less amps as they have passive crossovers. Bi-amped/Tri-amped mains are unnecessary complexity, in my view. I am sure you will also need an active crossover network somewhere in your signal chain with the 3732s.
If the 8340a are too large, can also consider the new klipsch kpt-8000 surrounds
**as I type this, I see some other folks have also commented on the mains and surrounds***
Last edited by Davecraze; 08-21-2014 at 08:51 AM.