So it seems like, for this room, I have essentially 2 or 3 options.
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Option 1)
Place the tower speakers close to the side-walls, with the subs inside each tower speaker.
This creates a fairly large area on the back wall where I can mount a screen. This is a pretty traditional setup.
Option 2)
Place the subwoofers in the corners, close to the side-walls, with the tower speakers inside each sub. This configuration allows for the POTENTIAL for a 9.1 system, where I could still conceivably have front wides, and perhaps also get better bass response from the subs. The problem is... it creates a narrower gap in the middle of the wall where I could mount a screen. In this scenario, I'd probably just have to use a television upto 75".
Option 3)
Construct a false wall across the entire front of the room, with an acoustically transparent screen in front of the speakers and subs. This brings the room in from 20 feet deep, to around 17 feet deep. This could be fine, but may cause a problem due to the angular shape of the ceiling.
Do you guys have any thoughts?