QUOTE(Jusstatic @ Apr 14 2017, 11:09 PM)
i all. i just got myself a yamaha home threater system. the speakers come with white wires hence i am confused with one should be connected to positive and which one should be connected to negative
one of the wire pair has a colour striped line. i read in some websites that the striped colour indicate negative while some other web sites wrote it indicates positive. now i am confused. can anyone here offer any advice?

Don't know where the myth started that you have to match colors to colors.
What matters is that you match the positive to positive and negative to negative to avoid polarity issues. The cable color doesn't matter because all it does is transport current to the speakers from the amp, they are still copper underneath their jacket. There are some custom cables that are wired only one way, but that's a whole different topic so don't worry about that.
The stripes/colors/shape of a speaker cable pair doesn't matter, they exist just to remind the user which terminal the cable is connected to.
So basically, the striped portion of your cable can go to + or -, it doesn't matter. You just make sure that if you connect it to + on the amp/receiver, you then connect it to the + terminal on the speaker. Repeat the same for all speakers.