I guess my question was in relation to balancing subs. If you have one main sub and one smaller balancing sub, will a second or even third balancing sub help smooth out the frequency across seats? Or, do you need two main subs and two balancing subs?
A good start may be to set up two subs in the THX suggested placement (in the middle of opposing walls) and the third sub- do a sub crawl and place in the best sounding corner of the room.
You can tweak from there. That's how I would start.
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