Voigt Domestic Corner Horn

Thanks. But, I think you can count on one finger the number of potential customer for the VDCH. Me. But, I am too cheap to pay full price. :)

It turns out there are several models of the VDCH. The heights vary between models, but, the sides are consistent at 24". I decided to go with the "prewar" model for my deconstruction efforts.
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Discovered the reason/logic behind the shape of the horn and the reflector; Voigt did something really clever. The two curves for the reflector are also tractrix. But, they are "flipped". The "mouths" of these curves point toward the sound source, the "throats" toward the room/listener. I do not know of any other such horn arrangement.

The horn itself is a quarter of a full tractrix horn.
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Interesting stuff.
 
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One of the many things about the VDCH that is so fascinating to me is the concrete reflector. The actual reflector is made up from two pieces. The one piece provides some compression to the horizontal driver through a square throat, and the other piece redirects the sound at a 45 degrees angle. IMHO, the concrete reflector, while fascinating, is the least elegant part of the horn.

So, in a departure from the original design, but in keeping with the spirit of it, my reflector will still be cast concrete. But, it will be one piece, the throat part will be round instead of square, and will employ a tractrix curve instead of a straight 45 degrees.

I know. I never intended to "copy" exact the VDCH; Perhaps if I have access to one. To me, the project is about understanding the genius of the man through deconstructing his designs and theories.

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I've been working on various details of molds and jigs and such for the VDCH. It suddenly occurred to me that the VDCH concept can be applied to an "omnidirectional" speaker design. Potentially, such a design would be a full range, front and back loaded omnidirectional speaker. How cool is that?

Below is a possible design.
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I've been working on various details of molds and jigs and such for the VDCH. It suddenly occurred to me that the VDCH concept can be applied to an "omnidirectional" speaker design. Potentially, such a design would be a full range, front and back loaded omnidirectional speaker. How cool is that?

Below is a possible design.
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Oh that is awesome, would be fun to test that sucker out. Depending on the driver configuration, you might be able to make a transmission line fit in there. Which is like the VDCH iirc?
 
Which is like the VDCH iirc?

I believe Voigt employed his quarter wave tapered horn design in the back loaded section. See the section below the speaker/concrete reflector shelf? That allows for a standing wave. The other path goes up, over, down and out at the front of the horn.

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I believe Voigt employed his quarter wave tapered horn design in the back loaded section. See the section below the speaker/concrete reflector shelf? That allows for a standing wave. The other path goes up, over, down and out at the front of the horn.

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Interesting, so much fun to learn more details around these designs.
 
Figured out the Voigt pipe configuration for the omnidirectional possibility. The body changed to rectangular to make it DIY-able. The design will be "on hold" for now. Need to get back to the VDCH. ;)

It will be tuned to the Lii Audio M6 full range driver. Rough modeled it for fit check!
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Rectangular body. Will be around 4.5' tall.
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Very cool. There have been quite a few omnidirectional speakers over the years using diffuser that at least on the surface have some resemblance to your proposal. Here are a few references, in case you're interested in digging into how others have done this.

Roger Russell has a nice overview of various older commercial designs including some that were co-designed by folks from Lowther and Harman Kardon.

Duevel makes a cool design which uses a two way diffuser, in case one need assist from a tweeter.

The Davone Mojo looks quite cool but is probably a very simple design without the intricate loading of your diffuser.

---Gary
 
You’re hitting the Voigt pipe hard! I can hardly wait to see a pic of you listening to it from the comfort of the sheet-goods lounger ala the Stegman “Maxell” ad photo
 
Nice work!!! That looks fantastic! There are concrete products out there you can skim the surface with, if you think it needs to be smoother. Looks pretty damn good in the picture.
 
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