The info on the OHM website says " All Ohm F’s are beginning the end of their functional lives. There is a foam damping material used around the base of the driver and inside that is failing from old age. We have never successfully repaired an Ohm F that was failing this way (the cone gets modified when you remove the old material and no longer sounds the same). For years, we replaced the old drivers with new ones. The last of these were made when the last craftsman retired. No more originals are available. But a series of upgrades with second generation drivers are available."
Worth a phone call I think, just to hear what the options are.
Worth a phone call I think, just to hear what the options are.