Stanley, I'll get horse whipped for this but J&M sheet is crap and has been since way back when. I got screwed once on a intermittent loss of sound, returned it, fought like hell to get them to do anything, their excuse was abuse on my part, they did eventually replace it and same thing happened on this set.
I then switched to Cycle Comm and I always had good luck with them, when Ron was alive and in business. He took my J&M ear piece apart, soldered the, as he called them cold solder point, and it worked for awhile. Ron said it probably wouldn't hold as they used reject speakers and not the correct wire for the task at hand.
He passed and his wife sold the company and his franchise to this outfit. I have gotten at least 2 helmet sets from them and to date not a problem with either one. One set is 14 years old and been in 3 helmets, other one is in the same helmet and I use it on the Chevy Trike.
Here is a link to them,
http://www.airrider.com/
