Anyone local ever build any sub boxes?
 

I need some help :(

Home or auto

Free air or enclosed?...

Home.

I need to build a 9.3 cu. ft. ported box (or two, ideally), with 3 4" ports, 25" long (which basically means they'll have to be curved). I think I can figure out how to do all that, but that makes the bracing WAY more complicated. That's where I'm in over my head, I think.

Are you worried about figuring the footage for airspace or just the pain in the ass of angling the requirements for the shape you'll need?...

The pain in the ass of doing the internal bracing. I'm just not very good at building stuff; even with instructions, it always comes out wrong. I am going to build the box slightly bigger than I need, and then I can use acousta-fill or pillow stuffing to bring the volume down as needed.

What I need as finished product, though, is 9.3 cu. ft. of air, and 3 four inch ports 25.59" long, so that the box is tuned to 19.8 Hz. This is for an 18" home theater sub.

Have you researched Sonosub?

They make them professionally manufacture them now, but the starters of the company made Subs with Sonotube [the form for concrete footings] and wood endcaps, sub on one end and port at the other, then feet facing down one the sub endcap.

Can be sized however you want, gussied up howe3ver you want, and tube design ameliorates need for bracing.

http://t3.gstatic.com/images?q=tbn:A...4f-_W8vzNHvAVo

http://www.hometheaterhifi.com/volum...ptember-99.jpg

http://i870.photobucket.com/albums/a...s/SDC11815.jpg

Thought about it, but I can't do a vertical enclosure (the driver would eventually sag), and a horizontal enclosure would stick pretty far out into the room.

Well, hmm . . . downloaded the Sonotune software for shits and giggles, and this one is telling me the sag is acceptable. WTF.

I guess the real question is where I can get a ****ing 22" Sonotube around here.

Is that a sub bigger than a water heater or just perspective?...

That looks like an old M&K box that was TOTL in the mid 90's...

I'd estimate 7 footer.

Based on his original post, submarine.

Oh, in that case.

http://t3.gstatic.com/images?q=tbn:A...dG76UZUWnkG3Tg