I've used the battery technique on many, many speakers, for over 40 years and have NEVER lost a speaker! AND, you CAN see, if not feel, the cone move. Use a 1 1/2 volt D cell....not a 9 volt battery. If the cone moves outward, the terminal that the positve side of the battery is connected to is the + side.Originally posted by John D:
Do NOT try the flashlight battery trick to find polarity. The windings on the voice coil are too delicate to handle it. Plus you'll never see the the cone/diapragm move.
Look VERY carefully at the body where the wires enter. You may find a microscopic + or - molded in the housing. OR.. If one of the leads goes to a capacitor that's the pos or +.
(On the tweets polarity isn't a huge issue, I've actually gotten better RTA curves having one inverted and one "straight up").