CCA CCA CCAW CCA copper-clad aluminum wire voice coils CCA CCA CCA [en] copper-clad aluminum-wire http://en.wikipedia.org/wiki/Copper-clad_aluminium_wire CCA https://en.wikipedia.org/wiki/Copper-clad_aluminium_wire https://en.wikipedia.org/wiki/Copper-clad_aluminium_wire copper clad aluminium CCA