thosb, I think as simmonmoon suggests it is time to replace those drivers.
Modifying drivers in the context of a speaker system without ample test equipment is a sketchy thing to do. As an example the coating added mass to the cone which changes the characteristics of the driver and then it's relationship to the crossover. God knows what that did to the speaker.
The LS 3/5A is a magic little loudspeaker. Why anyone would want to mess with it is beyond me.
Modifying drivers in the context of a speaker system without ample test equipment is a sketchy thing to do. As an example the coating added mass to the cone which changes the characteristics of the driver and then it's relationship to the crossover. God knows what that did to the speaker.
The LS 3/5A is a magic little loudspeaker. Why anyone would want to mess with it is beyond me.