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Originally posted by Sassmaster: Which do you guys think is a better choice for a voice coil? copper, or aluminum? I'm throwing my vote in for copper, because, even though it is substanially heavier, it is a much better conductor, and doesn't have the one nasty property that aluminum does: aluminum tends to burn up completely when it gets hot, whereas copper doesn't tend to do that until a much higher temperature is reached. Is lighter necessarily better? A lighter moving mass actually raises Fs (resonant frequency), which is seldom desirable. A lighter moving mass doesn't even affect a woofer's transient performance... that's essentially a function of inductance... a lightweight moving mass doesn't make the subwoofer sound any cleaner, or respond any faster to transients. Here's a good article on that subject: http://www.adireaudio.com/Files/Tech...ooferSpeed.pdf Even if it is true that Aluminum "burns up" when some temperature threshhold is reached, and Copper does not... it really is not relevant as thermal damage rarely involves windings melting. When a voice coil gets excessively hot, it exceeds the temperature of the glue holding it onto the former well before the metal itself would melt. The glue lets go, and the windings release, turning into spaghetti inside the motor. As for the rest of the differences... such as impedance... IMO those are just variables that a designer can use to his advantage. One may work better in an application than another... given a certain number of windings/layers with a certain gauge of wire, one may yield the target impedance better than another, etc. |
my bad aluminum is lighter, and you need a thicker conducter then copper to carry the sa,e current as copper, its softer and doent have as much tensile strenght
(i was confused and cheacked my 1st year books agen) |
it's not like you have a choice of options when you buy a woofer, if the one you like has aluminium coils, you use aluminium coils. |
^ BA wasn't exactly your typical "manufacturer" though.
If it came right down to the only decision having to be copper or aluminum I would choose copper myself but for no real reason [img]tongue.gif[/img] |
I plan on getting the aluminum coil recone kit for my solo 18X, for the high tuning that a wall uses,an aluminum coil is desired. :cool:
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Copper for daily driving and aluminum for spl.
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