Cardas Twinlink speaker cable polarity

Hi all there,
I wonder which conductor in the Twinlink speaker cable is the + and which is the 0? My bet is white for + and black for 0 but have found no answer anywhere, Cardas' pages included, that's why I am posting here.
Looking forward to receving a heling reply,
Kind regards,
I can't see why it would make a difference. Just use the same color at both the amp & spkr with the same polarity.