dual 6.5" transmission line enclosure

[pauld]

Hey guys, brand new member here, and my first post is shaping up to be, well, interesting.

First off, the car audio scene is not new to me, but I am re-visiting an old passion later in life. I was into it all in a big way from the early to late 1990's, but is all sort of went by the wayside (house, marriage, career... the usual suspects).

Now that I have "matured" (I think that means lost most of my hair), I am building a custom install for my car, which is a 1994 Supra twin turbo.

My listening tastes have ALWAYS leaned towards accuate, musical sounding woofers. My home audio system has a nice set of older KEF uni-Q speakers, ( they could use a bit of help in the deepest bottom end, IMO), and I like that lively, musical sound , and listen to everything from classical to metal to electronic music.

I have never been a fan of bandpass enclosures with "one note bass", and haven't ever heard a large (12"+) woofer I have liked.

OK, so the all important question is this:

"Back in the day" I always wanted to try a transmission line enclosure, but not much info seemed to be available on the ins & outs of that enclosure style at the time. Today I can look it up and calculate it no problem, but it still is a bit of a uncommon enclosure style. I don't know what to expect for its musicality, and in fact I have never even had the pleasure of hearing one in a car.

The calculations, fabrication work, fiberglass work, etc. are no problem to do, and are quite a neat project for me.

SO, I am planning on running two 6.5" subs - CDT audio ES-6MSub, and having this enclosure in the (shallow) spare-tire well of my Supra. The enclosure's interior will be much like a snail/nautilus shape within the tire well, to get the needed duct length and area for the 43hz resonant freq. and cone area of these subs. I know that the Supra's interior shape (tapered from hatch to front) SHOULD be ideal for a TL.

One "problem" I see, is the specification of these subs lists a Qts of .8564, with a Qms of 4.62, and (from what I have read) TL style enclosures "like" a much lower Qts.

What is likely to happen sound-wise with these drivers having this high Qts in a TL style enclosure....anyone?

Anyone here have experience with small subs in a TL that can comment on their musicality and depth?

Am I wasting my time?

PAUL