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Old 8th May 2013, 08:45 PM   #131
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Originally Posted by DrDyna View Post
I'm sure making sure stuffing is correct, as well as performance at higher levels should be considerations, nevertheless, here's the result of my little experiment.

All I did was rip out the piece directly behind the driver, which I figure was enough to turn it into a fairly well braced BR enclosure.

Not sure if this answers any questions or even creates more.

*shrug*
Looks like the BR has a better frequency response and is an easier build than the ODMLTL. I say go TTQWT! 7 boards minimum for a single fold.

Last edited by BP1Fanatic; 8th May 2013 at 08:47 PM.
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Old 8th May 2013, 09:08 PM   #132
DrDyna is offline DrDyna  United States
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Originally Posted by BP1Fanatic View Post
Looks like the BR has a better frequency response and is an easier build than the ODMLTL. I say go TTQWT! 7 boards minimum for a single fold.
And I like my T-TQWT enclosures for the old Peerless drivers I have, I'm just terrible enough with Hornresp to come up with something terrible if I were to try to model one with these drivers.

Edit: I do think however that if I use stuffing properly (my test box was stuffed rather carelessly) the response will be a little nicer.
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Last edited by DrDyna; 8th May 2013 at 09:15 PM.
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Old 8th May 2013, 11:44 PM   #133
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After tinkering with some T-TQWT options that I "borrowed" from another thread where Epic 12s are involved, the overall bandwidth and efficiency seems to be more on track with the OD-ML-TL.

Once I can get my nose to stop running, I'll go make some sawdust on two of these, after all, I was fairly pleased with the single one that was hastily assembled with not-so-careful measurements.

I'm also assuming that cutting to the nearest 8th inch is acceptable, some of these measurements call for .00x of an inch and I'm afraid I don't have a micrometer :P
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Old 9th May 2013, 01:22 AM   #134
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So, not a tapped tqwt then, you're essentially talking about a tube with a driver at one end that inverse tapers to a slot port at the other? Or am I misunderstanding your description?
Nope, the thread title is about non tapped TLs, so responded in kind.

Yes, the closed end is large, tapering down to whatever size the vent you want the vent to be. Normally it's a single fold with the driver placed either at the closed end or offset a bit.

GM
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Old 9th May 2013, 01:49 AM   #135
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Hi DrDyna,

Take a look at the drawing in Post #15 here:

Subwoofer driver choices for DIY sub.

It's derived from my Hornresp simulation in Post #8. Also, see bjorno's nice work-ups in Posts #12 and #19 in that thread. I think that's what you're looking for. You'll have to adapt the general form to your driver/Hornresp model.

As to the decimals in the measurements: 1/64th inch = 0.015625", 1/16th = .0625, a CAD program will give you something that cannot be achieved in plywood. Just use your best judgement, you can always use Hornresp as a guide to tell you which dimensions are critical.

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Old 9th May 2013, 01:54 AM   #136
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Looks good, now I've got a picture to show. Thanks!

GM
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Old 9th May 2013, 02:16 AM   #137
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Hi GM,

I like to draw to see if there is any reality connected to a simulation. :-)

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Old 9th May 2013, 03:23 AM   #138
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Understood, some of the THs I posted would have been quite a challenge to make.

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Old 9th May 2013, 09:04 AM   #139
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Quote:
Originally Posted by DrDyna View Post
After tinkering with some T-TQWT options that I "borrowed" from another thread where Epic 12s are involved, the overall bandwidth and efficiency seems to be more on track with the OD-ML-TL.

Once I can get my nose to stop running, I'll go make some sawdust on two of these, after all, I was fairly pleased with the single one that was hastily assembled with not-so-careful measurements.

I'm also assuming that cutting to the nearest 8th inch is acceptable, some of these measurements call for .00x of an inch and I'm afraid I don't have a micrometer :P
DrDyna, I am very interested in what you discover. If you don't post here please let me know where you post. Originally this thread was for a T-TQWT design.
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Old 9th May 2013, 09:10 AM   #140
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Nope, the thread title is about non tapped TLs, so responded in kind.

Yes, the closed end is large, tapering down to whatever size the vent you want the vent to be. Normally it's a single fold with the driver placed either at the closed end or offset a bit.

GM
GM, I am open to all ideas that maximize the potential of the LAB12 drivers for HT. Luckily DrDyna's TC Sounds Epic 12's model almost the same as the LAB12's, ecept for more Xmax resulting in greater SPL. I am stuck away from tools for several more months, this thread has had a way of evolving over time.
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