I am just looking at the install done in a used car I just bought. It seems
that they used Rockford Fosgate unshielded untwisted RCA cables (just
speaker wire with RCA ends).

I've noticed some alternator whine. Would I be better off using a pair of
shielded cables or making a set of twisted pair? (for some reason when I
think of twisted pair I always think of balanced output).

-Joe