Zero Distortion: Oswald Mills - the OMA OMG tour

awsmone · Mar 16, 2018

morricab said:
You can get about 30Hz from a 3meter folded horn...

Absolutely correct

http://redspade-audio.blogspot.com.au/2016/02/30-hz-horn-sub-continues.html

Folsom · Mar 16, 2018

Sure, a quarter wavelength gives you an output, but it isnt a true CD. Also I dont think anyone was specifically referncing folded horns. While it had similarities, it really isnt the point. True CD horns can have phase that other speakers cannot.

DaveC · Mar 16, 2018

Imo, directivity < 400 Hz or so is overrated.

awsmone · Mar 16, 2018

DaveC said:
Imo, directivity < 400 Hz or so is overrated.

Once the wavelength equal size of speaker then it’s P1

Horns of CD design will at low frequencies be dominated by higher modes perceptions, and the issues are clearly audible, as Dave C points out the CD horn advantages dissipate at low frequencies I have often wondered if this is the reason that JBL have never bothered with this in their low frequency transducers ?

Folsom · Mar 16, 2018

I think you're answering your own questions.

morricab · Mar 17, 2018

Folsom said:
Sure, a quarter wavelength gives you an output, but it isnt a true CD. Also I dont think anyone was specifically referncing folded horns. While it had similarities, it really isnt the point. True CD horns can have phase that other speakers cannot.

Straight or folded the needed length is the same. If you have room for a 3 meter straight exponential horn or two then you could do that as well.

awsmone · Mar 17, 2018

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Zero Distortion: Oswald Mills - the OMA OMG tour

awsmone

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Folsom

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DaveC

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