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In the Forum: Horn-Loaded Speakers
In the Thread: Problems with horns: upper bass
Post Subject: Clueless as to dresdendesignPosted by serenechaos on: 11/21/2008
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 Dresden wrote:

... two J-shaped horns back-to-back, as though it were a mirror image. 
--the drivers do NOT share the same throat, but instead each driver loads its own horn.  
I'm sure the 'picture' is now clear, correct?...
If you take into account the amplifying effects of nearby surfaces, the reasoning behind my approach for a Mid/Upper bass horn design becomes obvious...

Clear as mud... 
Actually, no; sorry, I thought I understood that it was a horn that loaded both sided of the diaphram, like old Tannoys, Lowthers, etc. 
Now I really don't understand what you're doing. 
Maybe you're on to something good...  

 Dresden wrote:

In regards to a phase plug... 
I will be using an electronic crossover in the completed system, to attenuate any unwanted frequencies outside of the target range... .
Think of it as a consideration of 'no stone left unturned'.  lol.  I cannot prove on paper whether the time vested in implementing a phase plug will be a complete waste--the only way to be sure is to build the phase plug and test/listen to the horn both with the phase plug and with a conventional flat section in place of where the phase plug was, and comparing both tests.

That was why I ask; just wondering why use a phase plug to push unwanted frequencies higher, to have to cut off electronically. 
Seems easier to do acoustically, higher frequencys don't want to get out of longer horns. 
Balance horn length, leave out the phase plug, AND extra electronics in the signal path... 

 Dresden wrote:

Think of it as a consideration of 'no stone left unturned'.  lol. 

Have you modeled these yet? 
What frequency response does that give? 
I know Romy doesn't believe in models, but most horn builders still do, and told me to... 
They don't tell Sound Quality, but they can predict frequency response within a few dB. 

 Dresden wrote:

Think of it as a consideration of 'no stone left unturned'.  lol. 

Or even maybe take Romy's advice about paragraph 3; read this site, most of this has been done before; e.g. phase plugs, transitions to horns...  
"My “homework” to you, as to a person who would like make commercial upperbass horns:
what do you think the relation of this third paragraph with the context of this thread? 
Mind you that it very loaded question." 

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