Well it is a DIY sub but I didn't design it. The former owner of diymobileaudio.com(before it got raped with ca.com types and commercialism) came up with the design and was interested in seeing how well production runs vs. sales would accommodate his lust for speaker design.
DIYMA 12" Sub CLEARANCE ... until supplies last - DIYMA.com
Supposedly this company built the speaker....
Huey Tung Electronic Co., Ltd. - HiFi Speaker,Subwoofer,PA Plastic BOx,Tweeter,PA Speaker,Professional Audio Speaker,Car Speaker,?Ceiling Speaker,In-Wall Speaker,Public address system,Components,Midrange,Multimedia Speaker;TV Speaker,??????,?????,???
Which one doesn't look like the others?I'm curious if they borrowed any cues from npdang's design.
EDIT: I clicked on the HT1207 but they don't appear to make it anymore since it lists a bunch of other subs instead. I have a R12 with a cone that imploded due to cold stress if you'd like a shot at DIY. A woofer cooker song came on as I warmed up my car below 0. The speakers weren't warm at all and the aluminum cone tore.
Here's another link...
DIYMA R12 Subwoofer... A history lesson. - DIYMA.com
Beautiful HT box made with this.