I've got a dedicated HT (13.5' x 18' x 8') I've got Def Tech speakers with a 7.1.4 Atmos setup with dedicated ceiling speakers. I purchased the R-115SW to ensure I had enough bass for the HT and it definitely does! While it's a dedicated space for HT, I still do have restrictions for Sub placement due to the seating and the R-115SW cannot be placed in the rear corners without blocking the path around the seating.
I currently have the R-115SW placed in the front left corner and as luck would have it... there is a deadspot exactly in the seating area! In fact, if I stand up, the dead spot is gone and when I sit down, it's there! I have yet to conduct the crawl test... the sub is pretty heavy and my wife definitely won't help me lift it... I'm also considering a 2nd sub but not sure if I should get another R-115SW and place it front right corner (seems like overkill as there is plenty of bass). Or possibly getting a smaller sub like a R-110SW which may be able to squeeze into the right rear corner.
Any suggestions or recommendations on the 2nd sub?