Posted by Wayne Parham [ 70.234.98.97 ] on August 28, 2008 at 17:00:19:

In Reply to: Removal of Transformer From Old Jensen Speaker posted by Eric Marangone on August 28, 2008 at 06:55:59:

Sounds like you have a speaker with a field coil instead of a fixed magnet. Does it have four wires coming from it? If so, it is most likely a field coil speaker. You'll need a power supply for it because one pair of wires is the field coil, which is an electromagnet. This is used in place of a fixed magnet. The voice coil works just like speakers with a fixed magnet, signal current is applied through it and this causes the cone to move.

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