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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.

At the bottom of the Reply to Thread page is a Manage Attachments box, click on that, and you can add pictures to your Post.

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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, 79 views)
File Type: jpg beymaG320-mouth.jpg (100.2 KB, 77 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.

http://www.danleysoundlabs.com/danle...t-ISO-View.jpg
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Last edited by djk; 23rd December 2012 at 12:26 PM.
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