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In the Forum: Horn-Loaded Speakers
In the Thread: The IDEAL horn system
Post Subject: Serious Coax? Where?Posted by rowuk on: 6/19/2019
 noviygera wrote:
 rowuk wrote:


I see a problem with any „coaxial“ attempt in one horn. The length of the horn is correct for one band, but not both HF and MF. If the horn is optimized for MF, if is too long for HF and works like a transmission line at those frequencies. The wrong horn flare means that the horn EQ is applied to the wrong frequencies with no appreciable gain where we need it.
Is a point source a „worthy“ goal? What sonic advantage does it offer? Is there a problem with convergence of the MF, HF and UHF at the listeners seat or is it a myth to promote hifi agendas?
Horns are decade devices as a rule (with few exceptions). That is based on the geometry of the horn, not how wide band the driver is.

I like the concept of point source not because it's trendy but because it provides equally timed room reflections and a natural acoustical environment. And a larger sweet spot of time aligned source of sound.
In my 1st example there will have to be DSP delay on the tweeter.

Are they equally timed? Looking at most coaxial schemes, the voice coils are NOT in the same plane, not adjustable either. Pile on top the WRONG SIZE HORN that has the length of a transmission line at HF. Sounds like trouble to me... Maybe someone has a better access to magic than I do...
My experience with coax arrangements is that the sweet spot gets smaller and is even less smooth due to transmissionline effects. In the case of D'Appolito there is a great upper MF loss in the vertical plane if you are not in the "sweet spot"

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