Question about JBL ESC-300 Speaker
I just bought this as a used system, got home, noticed that the power plug has been changed to a 3 prong one with only 2 connections (earth connector has no wires attached). Anyways, turn it on and plug in RCA cables and it hums, tried to plug it into my computer via digital coaxial cable...hums. And now it hums constatnly with no cables attached.
Replace the plug, they most likely had a ground loop where it was plugged in and cut the common to get rid of noise. Replacement ends are easy to find at Home Depot, Lowes, ACE, etc. Try that first, if you still have an issue, post a comment and I can help you further. Hope this helps
Posted on Jun 21, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
TIPDon't use a normal cable or satellite program for this; you're about to disconnect the cable that provides the audio and video for your cable/satellite feed.
WARNINGOddly enough, this solution (surge protection) can sometimes increase the humming.
WARNINGIt is unsafe to use a two-prong to three-prong "cheater" plug on the subwoofer power cord to solve the hum problem. Even if the subwoofer came with a cheater plug in the box, it's REALLY not safe to do. Don't do it.
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