What I like about this piece is the fact that the guy
built them as a joke out of scraps and it's become his
main system. Good graphics too.

What puzzled me was the use of the Audax driver (purchased
in UK) which I have not heard much about. Elsewhere it said
that PE had 'em but a quick check of the catalog came up empty.

Other variation on this that intrigues me is the voigt pipe
that uses one speak facing front and another facing back...
forgot the term for it. :-P

• Voigt Pipes

-akhilesh

'Tis Lon. ;-)

A more careful reading of the construction notes says
that the Audax driver used is discontinued and so is not in
the PE catalogue.

The Goldwood 8" FR PE part number 290-379 is _again_
out of stock but would perhaps model well for the
Voigt pipe. Since this driver is selling out on a regular
basis I'm thinking that the driver is being used for
current projects since it became available about half a year
ago.

Followup remarks did say that making a Voigt Pipe
includes a fair bit of luck. Terry Cain has also made
this design.

You may want to cross-reference it to the tube forum.

I think people sometimes get stuck in the same forums
all the time. :-)

The Voigt pipes look like a novelty but that's
what attracted me to them... their sculptural appeal.
The Full Range Driver site has more on this as does the
t-line discussion.

There was a neat open baffle treatment I ran across today
but I'll put that up separate.

[I have had lots of posts blow up because I tried to
link something only to come back to the desktop so will
make a separate ref again.]

• Alon Lotus variation on Open Baffle

• Linkwitz Lab Open Baffle

Not sure how the TQWT got going but prob'ly from the original
Augspurgher info available at t-lines as well.

Aesthetically, I prefer the bookends look of mounting the
driver on the 'parallel' side. Don't know if it makes a
difference, but it would effect construction of the vent.

Also many other groovy things at the t-line site.

• MLTQWT

Yes, My Mad catalog has it as a 6".

I put up this link because Akhilesh asked about why the
shape vs. standard BR. As a design, I think even a 4"
will give the effect in a less huge enclosure. TC may
disagree. His posted design of TQWT at the full range
forum is called Bigger Is Better."

Since Martin King still has some information to add to the
report, more will follow.