invertMASA

I have a 2011 Legacy, and putting new speakers in the front and soon the rear. Im trying to figure out what wire is the positive and what is the negative. Doing the front passenger side right now and there is a green and a black with a white stripe, I think. Its black, brown or grey, hard to tell. Here is a photo of it. https://photos.app.goo.gl/XdkFAT3MuZfW52HE9