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Thom, Do you still have the Ampex 520 Theatre woofer with the 375 pot?

Thanks Herki the cat for replying. This 2245H needs to be refoamed, and am wondering whether this is the reason for the spider sagging. The voice coil seems to be ok since I can jump it with a...

Do speaker spiders collapse and what causes them to do this. Is it repairable and how can you be sure the spider is damaged?

Thanks for the info. Have you ever heard any of these speakers, like the one that was listed for sale on Ebay (JBL/Ampex 150-4c, Model 520)? I read in one of the posts where the slug of the LE15A is...

Saw a speaker that used a 150-4c speaker cone and used a magnet assembly (pot) from a 375 driver. I understand JBL made the parts and Ampex put them together. I am wondering about the advantage of...