What does + or - in speaker binding translate to?

I am puzzled about how to wire speaker cables from amplifier binders that simply have + or -. Some of speaker binders are color coded, black and red, but mine, being cardas of some sort are simple gold in color and have + and - codes on them. How am I supposed to wire my cables. This becomes an issue especially because I am supposed to use reverse polarity due to my preamp. So, + or - and how do they translate into color coding for speaker plugs.

PAUL