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also make sure that the cone moves freely. you can apply light pressure at the edges of the felt dust cap. The cone should move easily. if it does not, the voice coil may be frozen, which would account for the sound.
These can be replaced with permanent magnet speakers, so long as you increase filtering in the audio circuit to get rid of the hum as well as at a resistance load to account for the missing field coil.
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Jordan
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