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Testing Speakers

It is crucial to determine which model of audio drivers are being tested. Then, disconnect the outside speakers from the two terminals on the back of the amplifier. Put a DC OHM meter across the terminals.

PD60 Drivers

PD60 Drivers

A reading of 9 - 10 OHMs means the drivers and wiring are probably good. If higher, then one or more of the drivers could be open, or a connection is corroded. If lower, one or more drivers or the wiring may be shorted.

SD60 Drivers

PD60 Drivers

PD60AT Transformer Drivers

PD60 Drivers