Stereo & Electronics - sub new speaker install

im putting in new speakers in the sail panel but i took it all apart and went to wire it up and i dont know whitch wire is positive and negitive. theres a blue and a green. any one know???

Which car...Camaro or Firebird and what year? They are different but the wiring color codes for speaker connections are available in the Monsoon FAQ at the top of the page in post #7.