@vcheney The suspension of the woofer is probably done in. You can get it rebuilt at a speaker reconing service. I would google it to see if one is in your area. We have one here in Roseville Minnesota that is quite good and been around for over 60 years. If that one is bad the woofer in the other channel likely isn't far behind.
Large Advents (1974) woofer pops with deep bass.
I have taken the woofer out of cabinet and swapped it to the other speaker to se if it might be a problem with capacitor but it still did the same in other cabinet. Seems to Pop on deep bass when cone is traveling out. Can I repair this or should I replace the woofer?