think i stumbled across a find for 12" sub

[peterS]

http://www.diymobileaudio.com/shop/product_info.php?cPath=22&products_id=32&osCsid=cbc274e3e967fbee5601a0d139ff5398

thoughts?

thinking of 2 pairs of dipoles?

[JonMarsh]

I might call that more a 15-20 mm Xmax, but if the BL curves are real, it looks pretty good. The Qts is a bit on the low side for dipole or IB at 0.354, you'd just have to use more EQ. Might be better in a ported box- have you tried modeling in Unibox? In a diopole you'd need to use a bit more LF EQ. Still doable, of course, if the rear air flow is quiet enough.

Looks like a lot of driver for the money, though inductive rise is pretty fast- with an aluminum cone, may be prettty stiff- any extended FR response curves anywhere?

For HT, a sealed box for QTC of 0.5 to 0.6 might be interesting, or more likely an EBS ported design, though I'd expect to see a bit of a saddle in the LF possibly with that high an Fs.

37 lb. is pretty meaty- these would certainly help keep your house from blowing away in a storm, but can you imagine what a two driver foce canellation sub sealed built with good thick walls would weigh?

~Jon

[peterS]

the only thing that i could come up with was a three way folded offset TL

havent measured it out but it may work

ill post cad drawings if i could transfer them to jpg

anyone know a program similar to snag it (the trial locked on me)

[Dennis H]

If you use Windows, MS Paint can do what you need and you already have it.

(Alt)Print-screen copies an image of the window to the clipboard.
Open Paint.
Edit/paste.
Save as a .gif for CAD drawings (jpegs are blurry and have huge file sizes).

Cropping is a bit kludgey in Paint but it can be done.
Click the selection tool (dashed rectangle) and outline what you want to keep.
Edit/copy.
File/new.
Edit/paste.

[peterS]

i dont have print screen on my laptop

[ThomasW]

This is an excellent freeware screen capture program

http://www.mirekw.com/winfreeware/mwsnap.html

[Robert_J]

npdang (designer/importer of this sub) doesn't recommend using it in a home theater application. DIYMA12 can I use it in home theater??????

-Robert

[peterS]

too bad- price was right

[noah katz]

That seems like an awfully nonlinear suspension - ideally Kms would be constant.

I wonder if part of the reason they reccommend a small box is so that the more linear air spring dominates.

[peterS]

That seems like an awfully nonlinear suspension - ideally Kms would be constant.

since when