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Old 14th March 2010, 04:13 PM   #21
GM is offline GM  United States
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Quote:
Originally Posted by Brett View Post
Ported isn't quite as easy. 30L models a really nice box, but the get a low enough port air speed, the port becomes very long. This is why PR's are suggested.
Ergo morphing the box, vent into a reverse tapered TL (TQWT) seems a good acoustic solution to an acoustic problem.

GM
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Old 14th March 2010, 06:20 PM   #22
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Ergo morphing the box, vent into a reverse tapered TL (TQWT) seems a good acoustic solution to an acoustic problem.
What would be the advantages of it over a sealed enclosure?
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Old 14th March 2010, 07:25 PM   #23
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More gain BW beginning below the driver's mass corner (~2*Fs/Qts) down to Fp where it will unload same as vented, but how much more will be dependent on the XO point/slope due the pipe's HF 'ripple' if not well damped. Of course if there's enough room gain to offset the vented alignment's unloading, then it's moot, otherwise some form of EQ may be required to protect the driver against excessive excursion.

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Old 15th March 2010, 03:02 AM   #24
tb46 is offline tb46  United States
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Default Trio 8 in TH-SPUD

Hi,

In the collaborative tapped horn thread aceinc started with the Trio 8s in a SPUD (Post #2816). This driver models well in a tapped horn, if you have the room, and if the limited frequency response is what you are looking for.

Aceinc added a lot of information in the Home Theater Shack.

(Tapped Horn Build TH-SPUD - Home Theater Forum - Home Theater Systems - HomeTheaterShack.com).

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Old 15th March 2010, 05:52 PM   #25
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Quote:
Originally Posted by GM View Post
More gain BW beginning below the driver's mass corner (~2*Fs/Qts) down to Fp where it will unload same as vented, but how much more will be dependent on the XO point/slope due the pipe's HF 'ripple' if not well damped. Of course if there's enough room gain to offset the vented alignment's unloading, then it's moot, otherwise some form of EQ may be required to protect the driver against excessive excursion.

GM
How big physically would a TL like that be?
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Old 16th March 2010, 03:32 AM   #26
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About the same as your 30 L alignment plus a low mach vent plus the wood to fold it up inside the cab = ~48 L:

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Attached Images
File Type: gif CSS TRIO 8 Fp = Fs TQWT.gif (14.8 KB, 156 views)
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Old 16th March 2010, 03:45 AM   #27
Mark Kravchenko --- www.kravchenko-audio.com
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Hi Greg

Your size is pretty darned close to the unhorn!

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Old 16th March 2010, 04:01 AM   #28
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Greets!

If you say so, I never got around to reverse engineering it.

GM
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Old 16th March 2010, 01:33 PM   #29
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Default Tqwt

Hi GM,

The Hornresp impulse response for the TQWT in Post #26 looks a bit erratic. I wonder what kind of a sonic signature would result from that?

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Old 16th March 2010, 02:12 PM   #30
Mark Kravchenko --- www.kravchenko-audio.com
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Quote:
I never got around to reverse engineering it.
I some how think you don't need to reverse engineer it. The design is not all that tough and I know your no slouch at figuring out horn designs. Your tapered pipe idea is pretty close to the same concept. Most optimal designs for drivers end up being quite close to the same size box when Fs and efficiency are taken as baselines. We end up dealing with the same motor structures and moving mass. The only real different systems are front loaded horns that truly push the efficiency levels up. But that's at the expense of box complexity and of a lot bigger box to.

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