Klipsch Horn Woofer designs....

[Frode]

Your LaScala sim looks just like the one I did a few years ago. Not very impressing on paper.

Frode

[djk]

LaScala with K43E (black) and K33E (gray):



Top graph: vented LaScala (black) with K43E (35hz tuning). Bottom graph: stock LaScala (black) vs vented LaScala (gray), K43E:



The vented LS is with 35hz tuning and no EQ. I designed the mod for 31hz tuning with the K43E and 6th order EQ (Q=2 at 31hz). With the longer ports and deeper tuning there is a gentler roll-off and less bass in the 40hz region, the EQ brings the 40hz back and leaves you with 31hz extension (in room).

With the K33E (15162) and no EQ, the 35hz tuning is to be preferred.

[WithTarragon]

"
... From the literature I am under the impression that Paul Klipsch considered the Jubilees as his finest, sadly I never had a chance to hear them. Obviously, both designs could today be tweaked with Hornresp and AkAbak."

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The Jubilee was designed in 1999-2000 or so. I am certain they had used the various professional modelling programs to tweak the design. They also had the advantage of actually cutting some plywood and building/testing them.

The are some comments about possible mods that were tried on the Jubilee (scaled down versions, larger versions etc), but you would have to scour many, many posts on that topic over at the Klipsch site.

[tb46]

Type: "rigma jubilee build" into the Google. :-) Plan on spending a few hours.

Regards,

[moray james]

Originally Posted by tb46

Hi Y'all,

I looked at these a while back, and entered then into Hornresp. For the LaScala I used the T/S parameters provided by moray james, and recalculated the values with Hornresp. From the literature I am under the impression that Paul Klipsch considered the Jubilees as his finest, sadly I never had a chance to hear them. Obviously, both designs could today be tweaked with Hornresp and AkAbak.

Regards,

I would be interested to see what could be done to the response of the La Scalla horn as it is an interesting design especially considering it is a 2 Ft. cube. I have found a somewhat larger horn which does not go as low but which has very smooth response, have a look. Best regards Moray James.

[moray james]

Lets try that link again. sorry I can't get the picture to upload so here in the on line address.
http://www.egbeck.de/bec2.htm

[bentoronto]

Originally Posted by moray james

Lets try that link again. sorry I can't get the picture to upload so here in the on line address.
BEC2Biex

Nice curve... the result of one-octave-wide smoothing? Not real-world, eh.

If you are going to shake a block of cardboard to produce sound, there's no substitute for impedance-matching to thin air using a horn. But when I look at some of the small horns, like in the link or the "tapped horns," I have trouble intuiting how much impact they could have on the radiation resistance on the cone... compared to say, the somewhat bigger and corner-loaded Klipschorn?

[moray james]

I would suppose the graph was smoothed most are. I imagine that it is probably a good response as far as the design goes so it looks very promising. The attempt was for smooth extension to 500 Hz, not deep bass extension.
Unfortunately Ernst has just recently passed away. Audio was only a small interest of his. Regards Moray James.

Obituary: Ernst Georg Beck | Watts Up With That?

[bentoronto]

Not that I want to speak unkindly of the recently departed, but with curves, the devil surely is in the details. Particularly when the irregularity is likely to be quite dramatic and in the range right up to 100 Hz or more.

I think it is fair to say the curve in the link is too far smoothed to be a useful guide to the performance of that horn.

Nice obit. Sic gloria...

[moray james]

Ben you may be right but the horn layout looks to be more gradual than the La Scalla so it may well be a smoother horn. I am curious to know if HR can predict dispersion characteristics or polar response of a horn design.
I am considering a horn loaded bass/mid for use with a set of Nick Mckinney's Unity Horns. I have several options and one was to use a La Scalla bass section the other this Beck design and the third is a Lambda driver in a reflex box. From what I have found out so far the Lambda 15 is likely my best choice but the efficiency of a horn loaded bass/mid is tempting and is a reasonable size. So I am looking into these options before I make a decision.