Old Jordan 50 mm modules

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I have a number of these Jordan 50 mm mid-tweeter drivers and despite their 12 13 kHz resonances would like to try them again.

The resonance gave them a somewhat harsh upper-mid range and irritating treble, but their lower mid-range was very clear and worth capturing.

The hangup is that the surrounds have become VERY stiff over time. My email to EJ Jordan with a request for help has resulted in silence. Can anyone old enough to have some of these make a suggestion about how to restore them?

I am good at small and intricate operations and have reconed larger speakers successfully and made very tiny devices of other kinds.

Any suggestions would be welcome.

Mick
 
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