First room I had it in is about 15x20 9ft ceilings, open to kitchen (included in space, small 2story townhome) movies it worked well, music it always lacked (logan dynamo 300 did better with music, not a whole lot for movies, logan amp failed so I picked up the dayton)
Have a 10 mon old so I moved all my audio from downstairs up to a bedroom, it was a hard decision lol. Bedroom is roughly 16x16 vaulted ceilings. Will be used solely for music.
The bedroom is definitely more speaker friendly, and I switch between boston a120s and mordaunt 902s. The sub adds nothing, I ran audisey on the dtr 7.8, no improvement, I got a dtm 5.3 from a buddy, was an improvement, oddly. But still lacking any real punch.
I'm going to keep the dayton for a dedicated theater when I purchase a house in the next yr or so, the 7.8 will be packed away as well