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In the Forum: Horn-Loaded Speakers
In the Thread: Tweeter for Vitavox S2. High-sensitively ribbons?
Post Subject: No problem with HF membranesPosted by Bud on: 10/24/2006

Paul

The entire pattern shrinks and grows geometrically, based upon the physical length of the edge of diaphragm involved. Please understand, this is not just a theoretical idea, I do and have done this process on many different types and sizes of drivers. I even have a basic amount of pattern application that is quite generic and has worked with equal success in all cases.

Please look above, for either the PDF or the link to a published copy and read the white paper for the EnABL process. It discuses the various types of causes for driver induced transient standing waves. There are some standing waves that cannot be treated with this process, but, since the driver engineering revolution two decades ago, there are very few drivers left with this sort of endemic limitation.

So, the pattern is applied with a technical pen, using a scaled pattern based upon the physical sizes involved, for the normally tiny drivers used in high frequency applications.
When the driver sizes scale beyond these pens I use calligraphy pens for their uniform flow rate and variety of sizes. With these simple tools I can treat anything from .5" in diameter dome to an 18" in diameter woofer with the same materials, though the material when used in the technical pens is thinned by a specific amount.
I am only interested in the few thousandths of an inch on any driver surface that comprises the boundary layer. And that few thousandths of an inch does control the rest of the drivers standing wave characteristics. This is really just a matter of having found the proper fulcrum.

I am located in the Seattle area, so we are quite far apart by horseback. UPS and FED EX do a pretty good job of carrying boxes full of speakers back and forth though......

Bud

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