Does anyone know of a JBL speaker other than the L3 (see photo) that has a flat front on the bottom half and drivers on a slanted front on the top half? The owner of the ballet studio where my daughter dances uses a pair of 13 or so year old JBLs shaped like that but isn't sure what model they are. She says one of them "has slowly started making a bad sound" so I told her I would try to fix them.
Maybe just a shot surround causing the voice coil to rub. Hopefully she hasn't been playing them since the noise started. What damage is common if a driver is played too much with a decayed surround? Does the voice coil crack or the spider get torn?