I get a loud intermitant buzz from one of my JBL eon 15-G2 speaker, no music signal just buzz. What is the problem do you think...? EQ circuit problem, speaker cones seem to be intact.

The voice coil in the big speaker could have been damaged if driven to loud. See if the burnt smell is strongest near the center of the big speaker. If the voice coil is fried, you may be able to still find a replacement as there is a part number for the voice coil (V/C Assy, EON-G2220-27005-00) and the cone (EONG2
Cone Repl. C2REON15P-2)

open it up and check cables leading to sub (large speaker) they're notorious for falling off - getting banged around

JBL EON 15-G2 Powered Sale Price: $649.95

you want JBL Professional group if this involves the Eon product line.

1-800-852-5776

Or on the website

http://www.jblproservice.com/

These are "powered" speakers and any little bit
of distortion can be amplified enough to "blow" it!
Also the amp could be "shorted"! Have your JBL
dealer test it!!!

Download service manual here:
http://www.free-service-manuals.com/JBL_EON15-G2_Service_Manual_L38587/

please use a different connectors and try if it works

from our experience rebuilding woofers once the lead wires get pulled too much or start to strain you have been running too much power into the woofer and making the cone move too far in and out.You need to cut the input signal from your preamp down and cut the volume down on the speaker input on you eon. We keep seeing too many of these amped speakers blown from too much signal.

my son and i fixed an eon a decade ago that had this problem. we swept a sine wave through the audio spectrum and discovered it started barking somewhere around a low D on the piano.
Turns out the mains connection was intermittent right where it enters the eon from the wall. Soldered the ac power connections and the problem went away.