Where to find OEM Dali Epicon woofer?

Since your dealer isn’t responding, you could try contacting Lenbrook if you’re in the US or Canada since they distribute DALI. Their toll free number and email is at the bottom of their website: https://www.lenbrookamericas.com/

Call first and talk to Bill, then send your woofer to Millersound Speaker service for expert repair.  Search A'gon for excellent reviews.

Millersound Speaker Refoaming, Speaker Reconing and Repair Services

If you need a new driver they make their own drivers. You need to buy one from Dali and go through a dealer most likely.

Thanks everyone, I'm in Bay Area, CA, hope to find a local dealer or repair shop.

Hmmm...blown woofers usually still make sound.  Check the connections and if the speaker has multiple binding posts make sure the jumpers are fastened correctly.  Good luck