Hi guys, I just bought an old school amp off of Craigslist the Rodek RA250E. Only problem is I don't know which speaker wire is which. There is a green, red, brown and white wire. It's in a 6 pin configuration in this order: *green*empty*white
*red *blue *brown

I figured red and white would be + but they
are diagonal from each other which wouldn't really make sense. Thanks guys any help is very appreciated.