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So are they permanent magnet speakers used as tweeters? A screwdriver attracted near the rear of them would show if they had magnets. There will often be a nonpolarized capacitor in series with the feed to a tweeter like this which passes only the high frequencies. With your ear to the tweeter and the treble turned up, should hear something.
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Reece
Perfection is hard to reach with a screwdriver.
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