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In the Forum: Horn-Loaded Speakers
In the Thread: The African compression electromagnet drivers?
Post Subject: Some thoughts about the audiofilofine tweeter.Posted by Romy the Cat on: 1/3/2011
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 audiofilofine wrote:
All parts of the tweeter shave been designed and built.All are built in magnetic steel in preferenceto pure iron because pure iron is heated during processing and after processing was not possible to check that the characteristics of the metal were the same as before processing.
Solenoidsto180voltssaturatethe core.

Diaphragm shave been modified by eliminating the resonance.
We tried two types of diaphragms and two types of horns with spinnerPFC.
With the horns of the first photo, the answeris within 1 db from 6000 to 23500 hz spl 110 d b 2.83V1 m,with the second type of horn  is within1.5dB from 4000 to 19500Hz with an SPL of 114 db 2.83V1m

http://audiofilofinehighendproduct.blogspot.com/2011/01/tweeter-horn.html 
audiofilofine,

I have a few comments and questions.

First about the posting. I guess you are from Italy and your use some kind of text editors that user a lot styles that are not renders properly a browser with western meetings. I just would like to let you know that my posting window has a tool that will fix all formatting problems. In the right corner or “reply” interface you will see a blue “W” button that says “Clean All MS Word formatting”. It is very helpful. Also the buttons on the extreme left “Preview Window” would allow you to preview your post before submitting it.

Now about your tweeter. If it is not some kind of trade secret then what diaphragm you used, how did you dealt with alleged resonances and the most important how methodologically you concluded that the problems that you reportedly had were resonance-related?
Another thing, you chose to close the return magnetic system with a solid cylinder that prevents hit dissipation from electromagnet. Do you driver get too hot? Can you report it’s temperature after 3-4 hour of operation?

Now, some more important thing. It is a pure speculative guess on my part but I would say that considering the type of the horn you use and the sensitivity numbers that you provided I can estimated that you do not saturate your gap hard enough: ether you run too little current or your use too low permeability of core. You see, this type of the horn (absolutely ridicules for a tweeter in my view) shall heave you over 10dB equalization gain. With 100% of driver efficiency and no horn EQ the sensitivity would be 111dB (1W converted at 100% to sound pressure).So, with this type of the horn and proper high saturation (for tweeter only) you shall have 118dB or even more. You might have problems to drive more current with this air-restricted electromagnet. Take a look how Cogent did their drivers – they did cooling in a very right way.

Rgs, Romy the Cat 

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