Help! Old speakers--polarity not marked [Archive] - Audio & Video Forums


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E T Frog
01-17-2006, 02:38 PM
I have a pair of old Fisher speakers I want to use, but the polarity is not marked. One terminal is marked GROUND/COM. Is that the positive or negative terminal? Thanks very much.

01-17-2006, 03:34 PM
the other terminal would be positive

01-17-2006, 04:07 PM

01-18-2006, 02:36 PM
As long as the cabling was identical on each speaker you should be OK. Another way to check polarity would be to use a AA battery. With cables connected touch each of the conductors to each end of the battery. If the cone moves out, the conductor touching the positive end of the battery is positive.