Sonnie-
I wasn't sitting. I chose not to sit in their "optimized spot" (which happened to be near the back of the room) and walked around, corner to corner, front to middle to back. Clearly, there was more output in the corners and by the walls. The F113 has it's own calibration microphone that they used. I don't think they actually measured the FR. In fact, most of the sales reps seemed intimidated by the F113. I found this odd, since in the other room they were selling $70K Wilsons.
Ideally, I would want a sub that would produce good bass wherever I was in the room. I like to entertain my friends and family a lot in my house, so people generally aren't sitting in one area for too long. In my neighbors house, the bass seemed to be everywhere. I'm not sure how he did it, but it sounded good. The room had cathedral ceilings and was about 20 X 16. He said that the sub used a 6.5" driver in a ported box and was rated at "250 watts". Either his setup or room acoustics must be PERFECT or I'm losing my hearing from all of this bass. I'm still blown away from the bass output and quality from his system. I can't even begin to fathom (sorry, couldn't help it
) how the F113 properly calibrated, or a Plus/2, would sound in the same space!