The Rythmic kit is certainly the one I favored the most since it is the least labor and engineering extensive way of getting into a DIY sub but the 15" servo kit is already more than $500 which does not include the enclosure.
This may sound inexpensive as compared to the available commercial offerrings but I just discovered in reading more about subs that there's one coming out within 3 months (i hope it's true) which will be priced at $599. This was supposedly designed by somebody held in high regard in the audio world and makes me put a "hold" on this project.
Wow that house wrecker seems to be an awesome way to really get into DIY assuming the claims are true.
