Ralph Mowery wrote:



I got some wire of 16 and 12 guage to use for 12 volt power wiring. It
may have been called speaker wire. A red and black pair.
The wire turned out to be aluminuim with a coating of copper.

I have seen some coax where the center conductor is aluminum with a
coating of copper, but this is for use at radio frequencies where the
skin effect is very much in effect.


** Copper clad aluminium wire ( aka CCA ) is commonly used for loudspeaker voice coils - enamel coated of course.

The advantage is lower weight compared to pure copper, leading to more dBs per watt.


..... Phil