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RE: A slim 6' high corner horn...how to do that?

Posted by Cask05 on June 23, 2011 at 04:59:47:
"I was curious why I'm not seeing 6'+ tall speakers designed for placement in a corners"

This is an interesting observation. Note that the width of most cornerhorns is usually a function of "bifurcated" or "W" horn section in order to evenly load the mouth of the speaker's bass horn with the room's corner extension. It you try to move a Khorn to one side or the other reltive to the corner centerline, what you get are two unequal horn "mouths" that are not conducive to lf Hi-Fi reproduction. One way to fix this is to enclose the back or the Khorn (something that was done on the 60th Anniversary Khorn design) so that you can actually move the speaker out of the corner a bit (up to about a foot before you significantly affect the 200-300 Hz band) and so you can aim the speaker at your listening position. This is a pretty big deal, as it turns out.

If I were to design a corner-loaded speaker to be high and slim as you suggest, I would first design the midhorn to control its polars in order to keep early reflections off the walls, floor, and ceiling. This means that the midrange horn mouth would necessarily be about 2.5 feet wide and tall (speed of sound dvided by the low crossover frequency: 1132/~500 - the wavelength at which the horn loses polar control) .

The bass bin, if it were to be horn-loaded down to a reasonably low Fc, would need to have about 12 feet of horn length (a folded design of course). [BTW: using a direct rediating bass on a speaker with a horn-loaded midrange/tweeter isn't going to be very aurally satisfying since bass frequency modulation distortion will be the ruling factor in how the speaker "sounds" for dynamic sound reproduction. This is why the Khorn has survived for ~70 years of production.] So the basic choices are: a bifurcated horn or a folded single horn. A tapped horn design (e.g., Danley, etc.) would have interesting horn-mouth bounce dynamics, but at least 3 dB more sensitivity but reduced bandpass relative to a conventional folded horn. As you might see, this is not going to be easy to design in a "slim" style, but it could be done. That's where I'd put my greatest effort: designing a 40 Hz Fc corner-loaded folded horn that is about 4 feet tall and about 2 1/2 feet wide, and TBD feet deep. Note that a single horn would tend to experience higher-order modes that would tend to be cancelled in a "W" design with its symmetric-but-opposing horn mouths. Additionally, the 1/4 wavelength distance corresponding to the distance between the two horn mouths horizontally determines your crossover point to midrange horn/driver - above that frequency, diffraction starts to come into play.

An interesting problem...Hoffman's Iron law still holds (TANSTAAFL).

Chris