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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. If the reading is higher than the listed value, 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.

==PD60 Drivers==
[[File:PD60Drivers.jpg|400px|thumb|left|PD60 Drivers]]
-Single functional PD60 driver will read 9.5 - 10 ohms
-Four PD60 drivers will read 2.5 ohms
-Two PD60 drivers together will read 5 ohms
-Four PD60 drivers wired into a speaker line roughly 250ft. in length will read 1.4 ohms
-Four PD60 drivers wired into a speaker line that is 25ft. will read .14 ohms  

==SD60 drivers==
[[File:SD60Drivers.jpg|400px|thumb|left|PD60 Drivers]]
-Single functional SD60 driver will read 9.5 - 10 ohms
-Four SD60 drivers will read 2.5 ohms
-Two SD60 drivers together will read 5 ohms
-Four SD60 drivers wired into a speaker line roughly 250ft. in length will read 1.4 ohms
-Four SD60 drivers wired into a speaker line that is 25ft. will read .14 ohms

==PD60AT Transformer Drivers==
[[File:PD60ATDrivers.jpg|400px|thumb|left|PD60 Drivers]]