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In the Forum: Horn-Loaded Speakers
In the Thread: JBL 2226 2445 2405 3-way and a path forward
Post Subject: Works only in some applications.Posted by Romy the Cat on: 1/24/2014
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 haralanov wrote:
Congratulations you have found and use this principle, otherwise the back chamber acts like pneumatic brake for the lower working range of the diaphragm!

Actually it shall act as “pneumatic brake” in a compression driver and the brake has to be tuned well under resonance of the driver. However, do not use word “brake” as it if from the words of mass-centric drivers. Horns are not about mass and exertion but about velocity and consequential pressure, so in horns there are no brakes but rather damping over rate of velocity change. The mechanism you depicted and I “found” is being used in headphones for years, very effectively. I have to note that very mild relaxing of a back chamber in compression drivers is NOT a universal solution and it works only in some applications and ONLY for very narrow bandwidth. In some cases if your channels cover let say 2 octaves then your drifty back chamber might e benefited for lower knee of those two octaves and act harmfully for higher octaves. A good driver in own secure and comfortable rage shall be back-sealed.
 

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