I'm sure each manufacture varies slightly to what they consider a small, medium or large room, but I used the estimates from the speaker manufacturer, Atlantic Technology since I have Atlantic's.
Per their web site:
Small - Medium <1,800 cu. ft.
Medium 1,800 - 2,500 cu. ft.
Medium to Large 2,500 - 5,000 cu. ft.
large >5,000 cu. ft.
Hope this helps
My set up
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