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29 bytes added, 20:15, 9 November 2018
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PD60AT Transformer Drivers
[[File:PD60ATDrivers.jpg|400px|PD60AT Drivers]]
These drivers have several possible taps they could be hooked up to. Our examples show a typical 60W tap connection. Even the 16 ohm tap is a transformer winding, so the condition of these drivers voice coils can not be determined without disassembly. Four large screws will remove the back shell (where the transformer is mounted) from the diaphragm assembly. The red and white voice coil wires can be disconnected from the transformer and measureddirectly. A good voice coil should read 9-10 Ohms DC.
The following measurements may be useful to determine initial condition of the speaker line.
*Single PD60AT between Common and 60W tap = 2.8 Ohms (regardless of voice coil condition)
*Two PD60AT drivers measured through 250 feet of speaker line = 2.8 Ohms
*Four PD60AT drivers measured through 250 feet of speaker line = 2.1 Ohms*Four PD60AT drivers measured through 25 feet of speaker line = 0.9 Ohms
== Testing speaker line ==
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