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Old 11th December 2012, 07:58 PM   #101
tb46 is offline tb46  United States
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Hi m R g S r,

It might do that, e.g.: TH-18 Flat to 35hz! (Xoc1's design), Post #1020, but take a look at Djim's last sentence there. Anyway, that's the thread with all the discussions.

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Old 11th December 2012, 08:25 PM   #102
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Okay So only the S shaped correction plate helps with uneven forces on the cone then, not the cone volume correction V's and such..?
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Old 14th December 2012, 03:24 AM   #103
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Please direct me to an explanation of why the throat of a TH is tapered, while the LAB 12 throat is not. Thanks in advance.
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Old 14th December 2012, 03:35 PM   #104
tb46 is offline tb46  United States
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Hi m R g S r,

Post #102: "...only the S shaped correction plate helps with uneven forces on the cone then..."

It looks like all the methods discussed (especially by djim TH-18 Flat to 35hz! (Xoc1's design) , and even going back to screamersusa's fury horn LIVE SOUND Specific Tapped Horn thread... ) would help, but it will take actual physical experiments to find out how much. I don't think you can get there without building and measuring (and at the limits this is not a trivial excercise).

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Old 14th December 2012, 03:46 PM   #105
tb46 is offline tb46  United States
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Hi phivates,

Post #103: "...the throat of a TH is tapered, while the LAB 12 throat is not...".

The space between the drivers (LAB 12) would be the throat chamber, and after that you would get to the horn, and it is tapered. The throat is just the smallest section of the horn, attaching the driver coupling chamber to the horn.

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Old 14th December 2012, 04:22 PM   #106
Veke76 is offline Veke76  Finland
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Quote:
Originally Posted by Dag Johansen View Post
Cluster of four @ x-max, not bad i think.
It is worth to notice the size of this cab, it is actually small, about 30% smaller than TH-18 (Xoc1's design) and TH 115/TH 118 by Danley.
Click the image to open in full size.

Dag
Intresting. How much output with single cab @ x-max? I might try your design!
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Old 19th December 2012, 05:36 PM   #107
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It appears that EPA drew a TH with S1 = S2 early in the C/E/X thread, which I'm only halfway through. I'm not in the market for 4 kw amps per driver, which is the direction that one has taken at page 40, so I'll read on after work.
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Old 19th December 2012, 06:40 PM   #108
epa is offline epa  Netherlands
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hi phivates
i simmed/moddeled many subs over time,so i'm not sure wich one your talking about.
fyi
a th with s1=s2 means ,it eihter has a chamber or its a symatric model.
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Old 21st December 2012, 02:23 AM   #109
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Post #8 in C/E/X among others. I'm a carpenter not a mathematician so I'm asking a mechanical question: does a parallel or non expanding throat chamber compromise results compared to the tapered (not parallel) throat seen in most of these TH designs? As a mechanic, I want to see my device, the driver, well served load wise, so the wedge incorporated in most of these plans looks problematic. In other words, what is gained by loading the driver asymmetrically?
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Old 21st December 2012, 07:53 AM   #110
epa is offline epa  Netherlands
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there are no pro's/con's to a straight or tapered throat,its just what you can sim or model.
if one makes the throat wider (paralel)then the actual horn ,it wil act more as a chamber.
a (bigger )chamber devides the pressure on the cone better,but also introduces a bigger dip just above the pasband.generaly speaking.

if you mean by asymmatric load,a non paralel throat path,threre are no pro''s/con's to paralel throat path.

if you mean ,an symatric th vs a normal th.
a normal th uses less wood for the same internal volume a aposed to a symetric model.
the uneven loading on the cone in a normal model "could" be a problem.
this is the advantage of a symetric model.
also the centered mouth could be prefered in the symetric model.

if you want a more even load on the driver ,you best use a chamber,or a bigger throat section
(both introducing a dip above pasband)or a symetric model.
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Last edited by epa; 21st December 2012 at 07:55 AM.
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