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Old 12th October 2012, 08:03 PM   #31
djk is offline djk
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Alas, I didn't think to save it, and Danley has since changed his site.

IIRC, the minima was at 28hz.
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Old 13th October 2012, 11:07 PM   #32
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Alas, I didn't think to save it, and Danley has since changed his site.

IIRC, the minima was at 28hz.
IIRC, Tom Danley told me the TH-118 was basically identical inside to the TH-115, though the impedance minima for the TH-115 is listed at 78 Hz, and 67 for the TH-118 .

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Old 13th October 2012, 11:19 PM   #33
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I give you the fake'n bake deluxe royal with cheeze:
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Old 14th October 2012, 08:04 AM   #34
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" though the impedance minima for the TH-115 is listed at 78 Hz, and 67 for the TH-118 ."

I was referring to the 1/4W impedance minima, which looks close to 28hz in the graph on post #33 (thanks to NEO Dan for the graph!).

On the older TH-115 sheet that I have, this minima is at about 36hz, hence the conclusion they are not the same length.
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Old 15th October 2012, 01:02 PM   #35
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On the older TH-115 sheet that I have, this minima is at about 36hz, hence the conclusion they are not the same length.
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Old 15th October 2012, 01:38 PM   #36
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th118 has a constriction in the path at the last bend.
Why?
What does that achieve?
Is it modeled in a sim?
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Old 15th October 2012, 01:39 PM   #37
Djim is offline Djim  Netherlands
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From ProSoundWeb

The TH-118 kind of fell into my lap,” laughed inventor Tom Danley. “Eighteen Sound introduced a new 18-inch driver that is tremendously powerful. I looked at the computer model of the TH-115, which is, of course, well suited to a 15-inch driver.

“Remarkably, when you drop the new parameters in, the model calls for essentially the same box that we are already using for the TH-115. We prototyped one with the 18-inch driver, and the sound was simply amazing.”
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Old 15th October 2012, 01:41 PM   #38
Djim is offline Djim  Netherlands
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th118 has a constriction in the path at the last bend.
Why? What does that achieve? Is it modeled in a sim?
Hi Andrew,
It is no more than a practical solution in order to make an 18" fit. The restriction is less than 1/6th of the path (and probably follows the round curve of the driver's edge) so its influence is very minimal.
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Old 15th October 2012, 08:13 PM   #39
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I guess the question still remains, why do they graph so different in impedance then?
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Old 16th October 2012, 09:59 PM   #40
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I guess the question still remains, why do they graph so different in impedance then?
The graphs use different smoothing, which accounts for some difficulty in comparison.
Using Hornresp, the Keystone simulation impedance maxima for a B&C 18SW115-4 is about 3 Hz lower than for an Eminence 4015LF, less of a difference than the TH-118 /TH-115, but a difference.

For what it's worth, the simulation reflects the actual FR measurement, though I never have tested impedance.
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