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Old 22nd December 2012, 09:10 AM   #1
DrBoar is offline DrBoar  Sweden
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Default Adding internal resonantor to back loaded horn?

I have recently tested the vintage Klinger 12" horn. With the right driver, in my case Beyma G320, I get a output of 35-130 Hz +/- 3dB measured at the mouth opening using Omnimic. However there is a large peak at 85-90 Hz that I would like to knock down 4-5 dB. Would a internal helmholz resonator do it? How critical is the placement of IHR in the horn path? The ones I have seen have the IHR at the driver or at least pretty close to the start of the pipe.

Photobucket is currently down so I can not add any images, however, if you take a look at Doctor Boar; DIY loudspeakers and HiFi for pictures of the horn, drawings, driver and measured curves.
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Old 22nd December 2012, 05:32 PM   #2
tb46 is offline tb46  United States
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Hi DrBoar,

One article that comes to mind is by E. Jakulis, TQWT Design Example: "...This article on the effects of Helmholtz resonators in TQWT design by E. Jakulis was brought about by an active discussion with Filippo Punzo." You might want to google it.

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Old 23rd December 2012, 10:03 AM   #3
DrBoar is offline DrBoar  Sweden
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Here is the drawing of the horn and the response of the Beyma Driver
Attached Images
File Type: jpg KLINGERschmacks3.JPG (104.9 KB, 101 views)
File Type: jpg beymaG320-mouth.jpg (100.2 KB, 97 views)
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Old 23rd December 2012, 12:19 PM   #4
djk is offline djk
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Click the image to open in full size.

1/4W stubs in the Danley DTS-20.

Try about 3" dia x 36" with some polyfill inside.
Candidates for the Darwin Award should not read this author.

Last edited by djk; 23rd December 2012 at 12:26 PM.
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