I'm really enjoying the IB. Overall I'm very happy with it, but I do wish I had a little better ULF extension. The subs do naturally start to roll off in my room at about 18hz or so - I have been able to extend that down to 16hz or so with the BFD, but I really wish I had a lower hinge point on my EQ to boost lower. I still do get a lot of ULF response (the kind that shakes your hair and such) but I know that I still have more headroom down around 10hz and below, but just cant boost that with a 20hz filter. Ive thought of buying a Symmetrix 551 EQ that has a 10hz hinge point to try and get some boost at 10hz.
I have wondered if maybe my dayton omnimic response is not accurate down low and the roll off is not as bad as it is, because sometimes it seems the response is there, but it does not measure that way. I have the early omnimic and need to send it back to have it recalibrated down to 5hz. I do know that on the "Irene" scene from Blackhawk Down, I do not feel much of anything of the 6hz signal (the higher harmonics are there) I did expect more room gain below 20hz, but that being said, the sub is still awesome and a lot of fun. The beauty of it is that it is so invisible that it is surprising (and sometimes shocking) when it comes to life. Had some people over that had not experienced the subs yet come over and they wanted to watch Hunger Games. Most of the movie is pretty light on the bass, but when the ship flies over or the cannon went off they were blown away and wondering where it came from.