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RE: Tweeter works with no connection in the attenuator socket

You would think if someone bypassed the fuse on the tweeter they would do the same with the mid driver as well. I wonder if a resistor was soldered in place behind the panel to avoid using the attenuator socket and that's why the sound changes when you insert a resistor. Only one way to know - unscrew the panel and look.
I have removed the tweeters from my IIIa's and also replaced the wiring (22 AWG magnet wire - single run). All it took was a screwdriver and a soldering iron. If you are going to check the resistance of the tweeters (I doubt that this will give you any useful information), then you will need to desolder the connnection to the shunt coil and just measure across the two ends of the tweeter avoiding measuring across the capacitor that is in series with the ribbon. My IIIa's measure 2.3 ohm, the 3.3's are about 3.3 ohm. For accurate measurement, check the ohm reading when the two test leads are touching each other and subtract the residual resistance of the meter from your measurements of the tweeter. My meter reads 0.3 ohms.



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Edits: 08/25/10

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