Hi, I've never posted but have been lurking quite awhile.  Alot of very good info on here.  

Thought I would introduce myself and document the build.  I built a 10" Db for a friend of mine over a year ago, and loaded it with an Orion HCCA.  I personally was very imperssed on the accuracy and output.  So I have gotten the bug to  mnake my own 12" Db.  I have been into car audio for 9 years and love to learn about it.

Well I made a few cuts and am not sure if all the measurements are correct.  Not to mention a couple of tornados just blew through.  >:(  

Anyway I have 2 sets of drivers either Kicker comp vr, or Orion XTR series 1.  I can run both Kickers or 1 Orion, got any suggestions on where to start?

i believe 60ndown used to have a db12 in a mazda 626....
post some specs on those subs you have and maybe some of us can point out which one to choose first ?

Here the specs on the XTRs,
12" DVC  250 continues/coil 500 max  4 ohm

FS - 23
Qts - .29
Vas, cuft - 7.78
Sensitivity, dB - 91 / 97
Linear Excursion, mm - 5.25

I have no idea why they list 2 spes for the sensitivity.

Specs on the Kicker comp VR 12 DVC 2ohm

Fs - 26.8
Vas, cu ft - 3.28
Sensitivity 86.4 db
Linear Excursion, mm - 11.5
Qms - 9.38
Qes - .596
Qts - .561
BL, TM - 18.3
Freq Response - 25-500

I will be running the DB with a Harrison Labs 800.2 audio engine.  800 watts rms@2 ohms mono.

How did the DB work in the 626?

UPDATE!

I decided to go with the kickers.  Got all the cuts made yesterday tahnks to Adrian for the cut list.  Should have it together tomorrow, or damn close to done.  

Pics to follow.

Why Chicken McNugget wood instead of MDF?

John C.

[quote author=Hotsauce  link=1141984443/0#10 date=1144111082]Why Chicken McNugget wood instead of MDF?

John C.

[/quote]

It's what I had lying around.  If I like how it sounds I will build one right, this one is kind of a test.  Atleast some of it is MDF.  ::)

MDF is not the only way just one preferred way..
I have made countless ported/sealed subs with what I had laying around..
If I remember right I have had wood come apart only once over the years.. It was particle board, it did take alot of abuse before it did..
More seams have seperated than the wood failing and the wood will seperate along the seams with the Particle board than any other place..

MDF is nasty dusty and please wear a mask,
I shapes and finishes well over particle.. the one in the picture is 5/8 sides and will be skinned with 1/4 veneer later.

Nice pics and nice work. I enjoy..
excited to hear how you like it..
this may sound wierd but if you sanded the black lettering off and added a urathane to the outside, that particle board would be rather pleasent

Well I didn't have time to post pics, however it is done.  

I did some tuning, seems the insert closer to the top the tuning is way high.  Then I moved it down some, got better, I boved it till the port was obsured by the insert 3 or so inches.  Not to my liking.  I moved it back to where the port is open and a little more.   ???

Listening the kick is very punchy, bottom end is fat.  However there is one hell of a peak around I guess 75hz roughly.  And then drops off significantly after 90 or so.  I have alot of tuning to do ause it sounds strange to say the least.

Also when I crank it the box seems to top out and not get any louder at a certain point.  Strange.....

sweet.  think you'll end up keeping it instead of building another out of mdf?  If so, what will you finish it in?  Looks like it was a pretty solid build.  congrats.

-biju.

Beano,


  Do you have enough space between the drivers, I.E are the surrounds touching each other...They don't need much of a gap, but they must have a gap.

   BobZ

As far as the surrounds toughing, I put 1/4" weather stripping around them and mashed it down.  I also made sure they are out of phase before sealing it up.

I think the amp is more than sufficent.  I ran the VRs with it in a sealed box before.  Here is the link for Harrison Labs  http://www.hlabs.com/  

It is the AE 800.2     class d 800rms @2 ohms.

I have had the Harrison for 4 years now and never had a problem.  Great amp.

I talked with another guy who built one and seems like the kickers need more air space.  I'm not gonna give up on the 2 of them yet.  Gonna try some polyfill in the sealed portion and do some more tuning this weekend.  Report to follow.