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In Reply to: RE: Questions about RCA MI-9584-A Drivers and MI-9595 Horns posted by MikePSD on April 29, 2020 at 04:53:40
I assume these are permanent magnet drivers and not field coil drivers.
(Field coil drivers have four terminals, permanent magnet drivers have two).
Test the drivers with a multimeter set to RX1. You should get a reading (10-20 Ohms), and hear a click.
What you don't want to do is connect them directly to a full range source. They must be crossed over, as low frequencies will cause damage if they are good.
Follow Ups:
They ave two terminals so I assume that makes these permanent magnate drivers. I managed to get the meter on them last night and inspect the diaphragms. They say 15 ohms on the terminals and they all look to be in very food shape for over 70 years old. The meter read the following, which all seems to be in range for what would be expected:
SN: 1254 = 13.5 ohms
SN: 1296 = 13.4 ohms
SN: 1306 = 13.5 ohms
SN: 1273 = 13.9 ohms
That seem right?
yes, that looks good.
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