I'm trying to picture the airflow, but this design isn't like anything I've seen before. It looks like the back wave can go both up the inside between the two boxes as well as inside the inner box? Where does the back wave exit the enclosure? I just can't see it from the pictures.

from what i thought happens, one wave is pushed between the two boxes and comes out the center of the inner box, while the other wave comes out the center box without goin inside the box, its length is 1/4 45 hz wavelength. I tryed to get it like the box on here, http://www.cowanaudio.com/th.html , except mine is like havin 4 of them put together.

That website makes it look like it is just a tapered quarter wave.

*edit*

You might find http://www.quarter-wave.com/ interesting. If you are interested in poking around more about different styles of enclosures go poke around www.diyaudio.com/forums, some quite interesting stuff is logged over there.

yea, i like the quarterwave site, i found it a few months ago and was up till about 3 am readin up on it.

i was readin more on the quarterwave site again, and it was sayin that for a trans line the cross area needs to be 2x the sd of the woofer, but i thought it needed to be 1x the sd.?

took it back apart to finish it up, it some what painted now and i put the 45's in, ill try to carpet it tomorrow after i get some glue.

sanded and painted

ive never had to put 45's on like this before

it need a little more paint too, but i ran out

Carpet time

Interesting.

hmmm. interesting indeed. whats it going in?

just my room for now, its really just a test box to see how well the design works.

I did throw it in my car for a day though.

http://www.youtube.com/watch?v=hxg3SP9RWaY

here is the second box it this comparison project.

inside. middle. outer.

finishing up

I would say this box is better than the first. i can stand outside my house with this thing on, and it still sounds like the sound is all around you. and all from 4 7in woofers. next up, one of these boxes with 4 sundown E8s, maybe the other box version too

nice job

this is the first time i have seen this type of enclosure

Looks cool as hell man

So I'm no pro when it comes to enclosures. All I've ever done is a sealed enclosure and infinite baffle. I've never seen anything like this before. What is the advantage of such a box vs a regular ported box?

OOOOOO NICE I LIKE THAT HOW DOSE IT SOUND? WHAT SUBS, LOOK LIKE GOLD WOOD FROM P.E.

pretty cool

yea. its those little $12 goldwoods from PE. I've been lookin at doin an enclosure thats a box inside a box and the port would be the space inbetween. then ones i started gettin into Tline boxes i thought this design would be easier to build and take ut less space to go into the corner of a room. this box turned out alot better than i expected. what i want to do now is build it for some 15s and throw it in a van or somethin big. but next up is 4 E8's