Sound coming from JL Audio F 113

You probably have one of the USA made jl audio products, lol.....I had way too many issues with the one I owned so I went back to Rel

If you have an original F113 (ie not v2), and it's never been re-capped, it's probably due. The original boards had capacitors that were marginal for the conditions. The factory replaces them with higher-temperature caps that are expected to last longer.

I do have the V2.

If it's under warranty, I certainly would send it back to JL for repair.

JL makes great subs, but if my experience is typical, not enough work is put into durability engineering in the design. My two F112s have been back to JL a total of four times (twice each). To JL's credit, they comped the last repair, even though the sub was about 12 yrs old.

Stuff fails. But when its a 100-lb subwoofer, the failure is really painful.

A few weeks ago the amp in one of my six year old F113V2's died, when turned on just made a "thump, thump, thump..." sound.

I contacted JL Audio and they have a "fixed price" update for out-of-warranty subs, where they not only repair the unit, but they also bring the componentry up to date with the updates they've made over the years.

The JL rep sent me detailed instructions on how to properly remove and reinstall the backplane amplifier.

I am super pleased with the service I received from them, I'd recommend you do the same.