Copper Voice Coil Formers!

BarakaBloke · 3rd February 2008, 04:11 PM

Has anyone heard of copper being used instead of aluminium as the supporting cylinder for a woofer voice coil?
What effect would it have?

BB

BHTX · 3rd February 2008, 07:52 PM

Copper is conductive.

This would have a very negative effect, no?

Conrad Hoffman · 3rd February 2008, 07:58 PM

The wire is insulated, so conductivity doesn't matter. Copper is very heavy compared to aluminum, but in a woofer it might be to advantage. It's also much more expensive than aluminum. I don't know about eddy current issues that might arise with either material in different thicknesses.

BarakaBloke · 4th February 2008, 03:16 AM

The standard voice coil former material is aluminium. It's used with an
insulated voice coil winding and in the form of a cylinder with a gap (so
that it doesn't form a complete 'turn') meaning electrical conductivity
isn't a problem.

The only useful difference I can see is that copper is a better thermal
conductor than aluminium.

BB

60 · 4th February 2008, 03:54 AM

the early versions of this speaker had 2 brass formers,

in the woofer.

not shure of the configuration

http://www.audiokarma.org/forums/sho...d.php?t=129375

3rd February 2008, 04:11 PM	#1
BarakaBloke diyAudio Member Join Date: Oct 2007	Copper Voice Coil Formers! Has anyone heard of copper being used instead of aluminium as the supporting cylinder for a woofer voice coil? What effect would it have? BB

4th February 2008, 03:54 AM	#5
60 diyAudio Member Join Date: Sep 2007	the early versions of this speaker had 2 brass formers, in the woofer. not shure of the configuration http://www.audiokarma.org/forums/sho...d.php?t=129375 __________________ none

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3rd February 2008, 07:52 PM	#2
BHTX diyAudio Member Join Date: Feb 2006	Copper is conductive. This would have a very negative effect, no?

3rd February 2008, 07:58 PM	#3
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	The wire is insulated, so conductivity doesn't matter. Copper is very heavy compared to aluminum, but in a woofer it might be to advantage. It's also much more expensive than aluminum. I don't know about eddy current issues that might arise with either material in different thicknesses.

4th February 2008, 03:16 AM	#4
BarakaBloke diyAudio Member Join Date: Oct 2007	The standard voice coil former material is aluminium. It's used with an insulated voice coil winding and in the form of a cylinder with a gap (so that it doesn't form a complete 'turn') meaning electrical conductivity isn't a problem. The only useful difference I can see is that copper is a better thermal conductor than aluminium. BB

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