I feel retarded but I don't know which cable is the + and which one is the ground on my mids/highs.
Here is a pic:
The mid has a black and a light blue cable while the tweeter has a white and a dark blue cable. There is nothing about it in their manual. The scheme that can be found in the manual shows a black cable for the - and a white one for the + on both of them. The manual is in black&white though