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Old 10th April 2009, 05:19 AM   #461
tb46 is offline tb46  United States
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Default Post #460

Hi Michael,

There is a "Collaborative tapped horn" thread, that might be more appropriate for this question, and without your Hornresp input screen even a crystal ball won't get anybody near an adequate answer. Naturally, that won't keep us from trying, or will it? :-), and what did I miss this time?

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Old 10th April 2009, 11:32 AM   #462
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My appologies; here it is...
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Old 10th April 2009, 12:25 PM   #463
AndrewT is offline AndrewT  Scotland
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0.5Pi is unrealistic.
S2 is incredibly low.
S3 seems a bit high.
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Old 10th April 2009, 03:14 PM   #464
tb46 is offline tb46  United States
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Default Post #462

Hi Michael,

I'll attach a four section version of a tapped horn simulation with your JBL 6.5" parameters, just as an example. There are any number of threads on tapped horns now, take a look at this one:

Dual 8" tapped horn = TH-SPUD

As to Hornresp usage, whenever your mouse pointer is on top of an entry field the bottom information bar tells you something about the field's contents, e.g.: Vtc's unit of measurement is cc. When looking at the schematic diagram the pointer will pop up information about different sections of the design. Also, the help file is really helpful.

I like to use the 4-section horn for a tapped horn as it provides added flexibility, and thanks to David McBean, the price is the same. Just have some fun with the Wizard, look at the other threads, and I'm sure it'll make sense very quickly.

Regards,
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Old 18th April 2009, 04:50 AM   #465
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Default throat chanber vs. throat

OK...that brings up more questions, but for those, I will take your advice and go to the "collaborative tapped horn project". (Yes, I know, where I should have gone in the first place...my appologies, and thank you all for your patience!)

Now for my current question. The short and simple version is: Where does the "throat chamber" end, and the "throat" begin? I read somewhere that the minimum throat chamber volume is the volume equal to that of the inside of the woofer cone; what if, as is the case with most tapped horns I've seen, ironically enough, the woofer is perpendicular to the horns waveguide? Does the throat begin at the center of the cone, or is all of the area between the plane of the woofer's gasket and the back wall of the device the "throat chamber" and the throat is at the top (for lack of a better word...this is assuming the device is standing on end) of the woofer? Again, in this case I'm only using a tapped horn as the example because most examples I've seen are configured this way...I'm actually trying to get clarification for a different project I'm considering, as I'm no longer certain that I'm quite ready to tackle a tapped horn...at least not until I've eased my mind that I understand these creatures!

Thanks again for all of your help.
Michael
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Old 19th April 2009, 03:48 AM   #466
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Default Re: throat chanber vs. throat

Quote:
Originally posted by bigdaddyrox4574
I read somewhere that the minimum throat chamber volume is the volume equal to that of the inside of the woofer cone; what if, as is the case with most tapped horns I've seen, ironically enough, the woofer is perpendicular to the horns waveguide?
Hi Michael,

Hornresp assumes that the throat chamber of a tapped horn is the effective air volume between the driver diaphragm and the throat entry point (the opening in the panel that the driver is mounted on).

See Note 8 of the Hornresp Help file for details. Select the Schematic and Chamber options in the Tapped Horn Wizard to see a cross-sectional view of the throat chamber. Adjust the Vtc, Atc, Ap and Lpt sliders to see how the chamber and the port connecting the chamber through the panel to the horn, can be altered. Lpt is usually made equal to the thickness of the separating panel.

The throat chamber and port are also shown on the main Schematic Diagram.

Kind regards,

David
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Old 25th April 2009, 07:45 AM   #467
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Default Hornresp Version 21.30

Hi Everyone,

Hornresp can now calculate the impulse response of a front-loaded horn or direct radiator loudspeaker system. My thanks to Jean-Michel Le Cléac’h for providing the necessary algorithm. No claims are made as to the accuracy of the results.

Version 21.30 refers.

Kind regards,

David
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Old 25th April 2009, 09:32 AM   #468
brsanko is offline brsanko  United States
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Sweet!!
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Old 25th April 2009, 09:41 AM   #469
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Very nice Thanx a lot!!

I´ve been very busy in the last few weeks so I didn´t have the time to take closer looks at the new versions, hopefully my schedule will loosen up in future....
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Old 25th April 2009, 11:10 AM   #470
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Sweet!

Will you add the ability to compare previous measurement with F4 as well?

Also export the IR to wave or other format that can be turned into it?
(would be fun to "hear" the horn)


Great work!
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