a decade or more ago I purchased a new Yorkville basshorn -15" custom driver, about an 11 cubic foot bulk box. I also had an 8 cubic Karlson type based on "Fig.6" of Karlson's final Acoustic Transducers patent 3540544. It had been cut for a 15 but managed to get a jigsaw into its baffle to open it up for an 18" speaker. Fig.6 showed a 3 panel approximation of an ellipse curve reflector. (That was done in Karlson's 1965 "X15" system). This build had more dip than K15 as K15 used a correcting front "shelf" board. (using less distance between the back of the wings to the baffe-reflector apex should lessen the dip) The cabinet was about the same bulk as Karlson's K15.
If building today, I would use a single panel above the baffle.
despite the measured dip, it sounded pretty good for music playback.
I was dismayed at the performance of the horn vs this unintended K18 with a Sigma 18a and that Yorkville has sat in a shed ever since.
It wasn't until some years ago that I found out that Karlson actually marketed a K18 and was featured in one of his brochures.
If building today, I would use a single panel above the baffle.
despite the measured dip, it sounded pretty good for music playback.
I was dismayed at the performance of the horn vs this unintended K18 with a Sigma 18a and that Yorkville has sat in a shed ever since.
It wasn't until some years ago that I found out that Karlson actually marketed a K18 and was featured in one of his brochures.
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Is that a Yorkville UCS1?
What driver do you have in it?
The original driver for the UCS1 was custom built by Eminence and apparently it is now widely available as the Lab15. If you have some random driver in the box it's not surprising it measures poorly. Also note the driver must seal air tight to the horn and the access panel cover must also seal air tight.
What driver do you have in it?
The original driver for the UCS1 was custom built by Eminence and apparently it is now widely available as the Lab15. If you have some random driver in the box it's not surprising it measures poorly. Also note the driver must seal air tight to the horn and the access panel cover must also seal air tight.