I know, I couldn't believe the last one either because the room is totally non-treated (i.e. no traps, etc.). I used the BFD (see above) to equalize the curve, but even so, I never expected it to get that flat.

I later added a second sub into the mix and could never get it this flat again, however, the response in general in multiple listening positions is better with two subs, it's just not as perfectly flat in the primary listening position (maybe it could have been, but I gave up tinkering at some point) \:\)

Epic 80-800: HG Cherry