Thanks for the suggestions on some subwoofers. I'm coming to the conclusion that with the increased sizes of some of these subwoofers, placement will be limited. My existing sub is in the front right corner and this is the only corner spot available in the room.
Given the suggestions made so far, the Rythmik FV-12 and Outlaw LFM-1 can fit in to the existing corner space, however, it will be right against the wall...not sure if that matters. If I were to go with any of the bigger subs the only other placement options would be against the back wall behind my sofa or against the right side wall.
What are the thoughts on the placement to the side or to the rear? If needed, I have considered upgrading to a larger sub such as the Epik Empire, Outlaw LFM-1 EX, or Rythmik VTF-15H, but only if it would net gains over the smaller subs in the corner.