Woofer popping sound

[bigsteff_dc]

Hello,

I have a pair of JBL L100T speaker that sound great except that at high listening levels, one of the woofer will make a popping sound. What causes this to happen? The woofer cone appears to be in great shape with no signs of cone or surround damage. Does this indicate a problem with the drive mechanism (voice coil / magnet structure)? What would be the fix for this problem?

 

[soundguruman]

Get the speaker reconed.
The voice coil is rubbing on the magnet.