A Simple Trick to Determine Correct Speaker Wire Polarity

To deliver optimum performance, your speakers should be connected to your amplifier with all the positive ends of your speaker cables attached to the positive connectors on your speaker. If you suspect the polarity is not correct, here’s a quick and easy way to check. Disconnect the speaker wire from your amp, then connect the cable to a 9-volt battery. The battery’s DC voltage will cause the woofers to move forward if the polarity is correct (that is, positive to positive). If the woofer moves backward, your polarity is reversed. If that’s the case, simply reverse the connection on your amp. Better still, simply use speaker cable that’s color-coded.