I see your point that could get confusing. I use a single Crystal Acoustics 12" subwoofer placed in the front of the room. It is a 200W 4ohm driver. For the new testing, I have a 20' bettercables coaxial cable coupled using the adapter to a 25' run of stereo subwoofer cable (using one side) that I used to use for my car subwoofers before I lost those. The receiver is a Pioneer VSX-1012 model.
The room is a dedicated room with an equipment closet and an entryway on the left side of the room. The closet in the front left of the room will be where equipment will be located later on. The room needs insulation in some areas and in some places in the rear of the room where not entirely finished due to budget limitations. As I am currently remodeling our other home for sale (painting, laying tile etc) we will be upgrading the HT soon. Two subs is an option but I have been advised to avoid this if possible.
Photos of the room.
http://www.flickr.com/photos/tns29/sets/
My build thread here that is very outdated at this time but will update. My father got a new 2007 Sierra, I repainted my crown molding, finished sealing my entrance door, got some 244 bass traps on the front wall, moved my speakers off the stage, and moved the sub to the front of my room onto a sub dude, and bought a new tweeter for my center channel since my last post.
build thread]
I think that the problem is not my rear wall but instead axial mode problems from my left right wall mostly relating to my ceiling. It needs better insulation and I hear problems near the steel beams up there. The pink insulation in it will maybe last another year but I hope to fix that sooner. Maybe inexpensive insulation left in the bag will help there. That may help improve the tangential and axial modes I seem to have very close around 60Hz. I'm not sure.
I will also use the new 4.11 version and correct my graphs. I have many on my website but that are not in sets that I will need to delete later. I thought while I was away, I would practice with my older measurements while reading.
I wasn't purposefully meaning to make things confusing but rather trying to clear up my own. I apologize to anyone to that I may have done so.
Thank you.
edit: I also got another mono amplifier.