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Magnasanti 29th June 2012 12:44 AM

Best former material ?
What is the best voice coil former material? Arguably the characteristics that define a good former is : Weightless as as close as possible, infinitely rigid, superconducting in the thermal zone, and 100% percent resistive in the electrical zone. I am sure at this point you could all agree with me. Now the most common materials are Kapton, Aluminum, Titanium, and beryllium. Titanium isnt really worth putting up i think as it is about twice as dense as aluminuim yet several times less thermally conductive. It seems Beryllium is the best material. Does anyone know of any other materials that would best beryllium ?

5th element 29th June 2012 12:54 AM

I don't think I've ever seen a beryllium voice coil former.

Magnasanti 29th June 2012 01:01 AM


Originally Posted by 5th element (
I don't think I've ever seen a beryllium voice coil former.

Actually me neither but with the extremely expensive speakers being sold i wonder why. It seems to have the best mix of desirable characteristics of any material that i know of.

tvrgeek 13th July 2012 11:57 PM

If you knew anything about manufacturing with beryllium, you would know why. Toxic, brittle, galls, and that is the easy part. A former for a mid-woofer might cost several thousand dollars.

The former mass and rigidity are not really relevant when you consider the windings. Aluminium does fine. So do several other non-exotic materials, like glue, paper, Kapton, fiberglass, Pheonlic and aluminum. I would prefer one non-conductive. Look somewhere else to improve the motor.

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