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Tweeter works with no connection in the attenuator socket

That just ain't right. The attenuator resistor or jumper has to be in place for the tweeter to work. Clearly someone has bypassed the jumper which is not a bad idea in itself. So I suspect that the modder screwed it up and the easiest way to do this is with a rotten solder joint. I wouldn't be surprised if the modder also bypassed the fuse as well.
My suggestion would be to first remove the fuse and see if the tweeters still work. This will put to rest whether the fuse was bypassed or not.
Next I would open up the panel in the back and look at the wires going to the attenuator socket. I am sure you will see that they have been modified. Then I would get a solder gun and some solder and reheat the joints until the solder flows. Take a listen and see if your problem has gone away. And if the fuse block has been bypassed do the same with the "new" connection as well.
BTW I would put my money on the tweeter that sounds duller as being the problem child.



"Our head is round in order to allow our thoughts to change direction." Francis Picabia



Edits: 08/24/10 08/24/10

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