http://www.diyaudio.com/forums/showthread.php?s=&threadid=47558&highlight=

Can a folded design be compacted?

When I was thinking of this I had a desing in mind and then today,
BOOM! there it was. somebody had made it.

So can anyone venture an opinion as to whether such a design works
well and is practical? The sample graph shown in the article
does not look especially smoothe.

But I've been trying to figure out a good home for the TB 871-S
pair I have. The design orginally given and built just has not
been successful.

• Tangband "brick"

I have not built Cyburg's "Brick", but did build his Needle design last month. According to Cyburg, the Needle is essentially the same speaker as the Brick, but folded in a different manner. Compared with a simple vented enclosure like the ELF design, the Needle and Brick is supposed to extend the bass down by an octave to about 50Hz. BTW, the ELF is a 0.1 ft^3 vented box with 1" diameter by 1.5" - 2" length port.

I don't have the techical backgroud to say if this pipe design can actually extend the tiny Tangband's bass this low. I can however talk about how my ELF and Needle compare, as I built both at the same time.

Do my Needles go down to 50Hz? Not to these ears. In fact, I wouldn't even describe my Needles as having more bass than the ELF. The sound between the two are very similiar, with the only difference being that the Needles have a fuller, more balance sound. Obviously, the Needles do extend down further than the ELF to create the more balance sound, but not enough to give any real sense of bass.

Hope this helps.
gar.

• Tangband Cabinet Photos

I would be happy to get good midrange out of the TB's and
am beginning to think that the minimum for decent output is a
4 in driver like my Fostex FE127e's. I also have a set of
PVC pipes (4in diameter) with the old Radio Shack 1197's
which also perform well in a long pipe.

I did an experiment with a small baffle mount of the
TB 871-S in a PVC pipe of 41 in which is a quarterwave
length for 65 mhz IIRC.. don't quote me.

It didn't work satisfactorily in that transmission line
concept: PVC pipe with straight pipe and a hard surface
terminus at the exit in the form of a flooring tile.

Not much count.

Here is a concept that I just ran across at the Full Range Driver Forum for a Fostex. The interesting thing about this one is that
it uses a similar concept as that of the Jordan VTL but for a much
less expensive single driver. This I thought was a real 'find'
and had not seen it anywhere before.

• Fostex Spiral concept-- drawing

Sure. but regardless it still has to take up the same volume. It may be easier to make it taller , but less width, or shorter but greater width or depth. But the end result is it will have to be the same volume for an equal performance.
ron