Crazy that this little 1200D is causing this much chaos LOL. Some who love it, some who hate it, some undecided, some intrigued and thinking they may want to try one. And then some who just can't not even fathom why some are putting such a "piece of garbage" into the mix of an already high end top notch (reference or near reference) system.
I know there are probably better MBMs out there (mag12, pa460, etc come to mind, especially if you don't mind DIY/AIY). What ever your opinion of the 1200D, there is no denying with it's port tune up higher, it can and does (for a lot of us) add at least a little to a substantial amount of chest slam/pressure/shortness of breath. Whether or not that brings down your overall SQ probably has a lot to do with the way its integrated and how much its actually contributing compared to the rest of your subs.
I know for me personally, its not contributing a ton because 3 of my DIY sealed 18's that are NF right behind me are already giving me an amazing amount of chest slam. With the addition of the 1200 sitting on top of them, it takes that kick to the chest up another notch, with no loss of SQ (if I don't get to overly carried away with the settings on it a least). I know some are not into that over the top feeling, but I love it for movies.
For $300 or less, what's the big deal to try one out. If its hated or doesn't add anything to the chest punch experience and brings your SQ down, then $10 sends it back (Crutchfeild). I'm sure that's part of the problem though around here is that, how can something so cheap add so much, according to some of us anyway. I'm a believer because I've experienced it first hand. That said, knowing what this little "POS" can add
Fineberg (it probably is mainly being used for the air being pushed out of its ports), I'd love to try a mag12 in place of the 1200d for comparison and probably will some day.
Actually I'm not really surprised this 1200d MBM is causing such controversy. iirc, the MBM from HSU was kind of the same way, but not to this level.
I'm not fortunate enough to have a dedicated room like some of you here and the only way I can get the kind of bass that I crave in my big open living room is by having multiple 18's behind me with the addition of the 1200d helping as well.
I'm grateful for this place and for the folks that are open minded enough and willing to experiment and share there experiences. If not for this, I may have never tried out nearfield with true subs or MBM's. I'm open and willing to try just about anything to get that amazing and ridiculous bass/HT experience that I'm after. If it doesn't work, then try again with a little different strategy