i recently added a 4 channel amp and i need to make sure that i have the polarity right on my speakers. i read on a post somewhere that if you set the mm to volts and put the leads on the speaker terminals (+ to + and - to -) you would be able to tell. it said if the voltage goes neg, then polarity is reversed. that didnt make sense, but i thought id try it. didnt work. always said 0 volts. does that mean play music then put the mm on the terminals while the music is playin? then check if the voltage is pos or neg? all i can find is people sayin put a battery on the terminals, but my speakers are behing the door panels and under the rear deck so i cant see if theyre in or out when the battery is on them. any help? if anyone knows, im sure you guys know.