Here is the exploded view of the DB212.

https://www.decware.com/newsite/dbk12.htm

The picture is upside down so the panel you mount the subs to is not in view but it does show a good pic of the insert. I like to be able too take the insert in and out of the enclosure. This way you can mount the subs to the insert and then install it into the DB. The subs should be mount to the bottom of the insert in the picture. I know it is a little confusing but when you build the insert there is only one place you can mount the subs and the enclosure operate properly. If you need more info let me know.


HT-EXT

You have alot of options when mounting the subs. Alot of people counter sink the first sub into the baffle (magnet inside the insert) and then mount the other sub directly to it. Not my favorite. You could leave the baffle for the insert removeable and attact one sub to each side of the baffle. Counter sink the first sub and use another piece of mdf to make a sub baffle to attach to the insert that would fit directly over the top of the first sub. It is really up to the builder to decide which way he or she likes best.

Anytime I clamshell two subs I prefer a small gap between the subs so they will not come in contact with one another. You could also use weather striping to give that little bit of distance between subs when clamshelling. The options are yours to pick from. Build it and Boom.



HT-EXT

Sounds like a good plan to me. I have built the DB with the insert baffle removeable. It helps when changing subs and you don't haft to pull the insert in and out of the enclosure.


HT-EXT

cool, thanks.
i'll run with that idea for now so unless i come upon some issue with it.
(i hav a sinking feeling i might have an issue with space on the inside but think i have a way around it sorted already just in case)

Here are a couple shots from my db10 build.  I think they are the same as the db12.




I used bolts through both speakers to mount the speakers, but it looks as though there is enough wood there to use screws if you wanted to.  If it is a major pain in the @#$ to move your first speaker totally inside the insert box I would suggest trying the DB12 with only one speaker.  If you don't really, really like it with one speaker, you probably aren't going to like it all that much better with two.  Also note that a DB12 can be quite dependent on its environment.  I had mine in my car and it was ok, but nothing spectacular.  Then a friend, who has had a lot of auto audio experience, tried it in a van and it preformed better than any sub he had ever heard (I haven't seen the DB12 since).  

Dan

what dank has done wont work on a DB212 as the inside size is only 12inches so the sub only just fits as it is.

what i have done is similir to dank,
i cut an extra panal B, and
i used a router to house cut the speaker hole into one side of them.
thinning the panal to 6mm.
this let me sink the first sub into the panal, i used 4 screws on this sub in the holes that where over the sides of the inner box.
then i used the extra panal b i cut and had the routed side facing down, this meant the extra bit of the sub's rim that was sitting above the surface of the first panal, would sit into the cut out of the second one so the second panal would sit flat, then i screwed the second sub face down using short screws in the 4 holes that lined up with the other screws, and longer screws in the others to go through both subs and the wood.

the extra bit of work means i dont have to have the speakers touching at all and gives that little extra bit of clearence for the cones moving.

well, it's all together now and i have to say, i'm very very impressed.
have it in the boot of my car (528cubic litres) and it pounds very hard for the cheap subs i have in it.

gotta finish the edges of it and smooth it down then paint it.
then make another one now that i know how.