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In the Forum: Horn-Loaded Speakers
In the Thread: The IDEAL horn system
Post Subject: The ideal dual-concentric horn instalation.Posted by Romy the Cat on: 12/11/2005

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 MochaMike wrote:
A stereo three way horn system with a dual concentric 15" woofers backloaded to 50 cycles and front loaded  with a  short round tractrix horn  200-800 cycles handed off to the  concentric  2"  compression driver loaded with it's own round short conical horn with a series network.  Below  50 cycles self driven 1/8th space horn subwoofers in mono with 18"  high BL drivers.   Surely you will find this barbarian and obnoxious but it does offer many attractive virtues over a four or five way array

I do not find this idea barbarian but rather very clever. The biggest problem with dual concentric sound is thier mix of dipoleness at upper bass and all of those vintage Tanoys sound consequentially…The problem might be cured high-passing of the direct radiator channel with high order filter, it un-tight the direct and back loaded channels but it unfortunately introduce all problem of high order filers into the direct high-passed channel, making it very amusical. What you suggest is quite interesting: to load the direct cone of the dual concentric with short round tractrix horn. This is defiantly a very witty! By loading the direct cone with a horn we introduce a perfect acoustic high pass and we could dial in the exact cut off where the back loaded channel would take over confidently. Defiantly this idea does offer many attractive virtues. Did anthology ever did anything like this?

I ask if anyone did it because there are some native problems entrench into this approach. The first would be throat of that direct 15 cone. If it were too large, for instance 12”-15” then the horn would not attenuate the lower knee, as it would be too undersized. If to drive the throat lower and to make the horn slightly longer then following problem would kick in:

1) Inside this horn would be small horn of the HF dual concentric and with the smaller throat of the outer horn it’s presents would be too tangible.
2) The longer horn would produce a higher throat reactance but since the drive is back-loaded into own horn it is unknown how it would behave without our ability to damp the cone with a back chamber.

Theoretically, if to tune the reactance of the direct horn and the back horn (by adjusting the throat diameters, I do not see any other ways to do in this setting) and make the driver to sound well under this condition then it would be possible to get a phenomenally interesting result. The problem is that by changing the throats we need to change the length of the horn… I really do not know how a person could research his subject and fine un optimal seating in this case. I know that if one would go over it and do tune this into something that perform well then it would be truly a peaces of loudspeakers art. The only question would remains: how optimum that optimum would be… :-) Still, This conceptual idea is very-very much worthy, from my point of view, to run for the ultimate horn setup.

The only point of objection that I would like to bring is your proposal for the bottom octave. The Audio propaganda conceived and convinced the audio people that bass is non-directorial and might be implemented as a mono solution. It is a very-very mistake vision! Bass MUST be completely separated by right and left channels ….all the way down. No mono bass must be used.  Yes, one more…defiantly bass should not be the “self driven”… :-)

Romy the Cat

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