Well, one of my trusty Fathoms has become wonky and needs to go to JL for surgery. Any recommendations on which shipping company to use? Got some online quotes from FedEx and UPS and darn near fell out of my chair. Then again, they're not exactly light are they?

Just remove, and send back the Amp Plate. ;)

It's the flat fee thing. They need the whole sub. Story of my life, ML. Rode hard and put away wet.

I will say Subscribers get to use my Freight connection, and save tons of money. :yes:

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First post as member of this fantastic forum. Repaired my F113 following the instructions here two years ago, changed the two capacitors in the standby power supply. Now I suddenly experience a period of hum following power outages. The hum disappears after 10- 30 minutes and the sub works perfectly therafter. Suspect that there might be an issue with some of the other caps as well, i.e the larger 2200uF 200V. Anybody else having this kind of symptoms and have replaced the big caps? Or is it more likely the other remaining smaller caps that cause the problem?

Norway1000... Welcome to AA! :wave:

I recently sent one back to JL. I sent UPS, but it was too expensive. It came back from JL via freight, but I can't remember which company.

Thanks to this thread, I managed to repair my F212 V1.

Appreciate all the kind folks here for sharing how and why the board fail and even how to remove the amp board from the subwoofer. Thanks again.

FIXED: Replaced the 5 small caps C504-C508 and the hum problem disappeared. Was planning to also replace the larger 2200uF caps but I had unfortunately ordered caps with too large diameter (35 mm), installed version is 30 mm. in diameter.