Marchand Bassis - DIY Kit ?  

I'm thinking about adding a bassis to my simple dual 10" driver sealed Sony wx-700. Figure it might be able to eek out another octave or so.

I'm a fair hand at soldering, have you assembled the one board kit (i'm using it for a single sub at the moment)?

Any leads on where to acquire a 15V power supply?

Thanks in advance.

I don't know if it has such filters, though the dual 10s give it more surface area than a 12". which may keep the excursion needs in check. of course since it's off the shelf, I don't know what the driver excursion really is, but it has impressive surrounds :)

Let's say I like to fiddle and am curious about what it takes to assemble the base BASSIS for one channel - any one with experience in that?

Here's the sub graph from REW - nothing special, of course.

I'm mainly just looking at playing around a bit, but as some previous poster's have said, perhaps the sub has filters that are already curtailing sub-20hz response. $388 completed is too much - I'm more looking at the $70 board and components. Add on $25 or so for the power supply, $5 for a DIY box, and it might be a fun toy. If nothing else, I can fiddle with Q.

I already took back my outboard sound card, so I can't remeasure right now using a lower freq sweep.

I was also looking at this L-T circuit at ESP, maybe that would be a better idea? It's about $30 for the board, plus components ($25 p/s, maybe $30 more the L-R-C)