In the picture from hifishock posted by Earl k the text on the tranceducer is differen't from martin wu's picture.
Have anyone removed a driver from 4365, and if so, how is it done?
Remove the back access panel.
Disconnect the wires.
There are two screws on the horn and two on the bottom where the L-shape plate is. Remove this. Take care of the gasket.
Remove all this, L-plate and the tweeter.
Then there are for bolts on the tweeter where the L-plate is attached, remove this and you have the 476mg free to dismantle.
Look for technical manual of 4365.
Hops this helps.
It could be a cleaning solvent residue or a metallurgy problem with the enamel or other coatings, adhesives used on the voice coil or the glues used to bond the voice coil to the diaphragm. If the acquaplas is effected then it could be vapours from adhesives. Sounds like a problem in production (Mexico) if it’s not an isolated case.
I recommend you talk to a JBL consumer or the reseller you acquire the 4365’s from.
Of course.
The think is why did the owner not take the loudspeakers into the reseller in the first instance.
Because he had tampered with the loudspeakers it may not be covered under warranty.
It’s like lifting the lid on an amplifier because you think there is a problem with it?
Can he prove a difference in sensitivity and that this is the cause?
I am not sure cynical (miss trust) publicity is appropriate unless the business can confirm what the issue is and if it is the actual cause as alleged.
Very moist air is not compatible with compression drivers. The patterns on the phase plug side of the diaphragm is typical of moisture entering the horn throat.
A dehumidifier might help in the room where the speakers live. A piece of open cell foam over the compression driver exit might also help reduce moisture entering the internals of the driver.
Edgewound...JBL Pro Authorized...since 1988
Upland Loudspeaker Service, Upland, CA
Some pics of mine 476mg. The speakers were bought brand new Des 2011. My listening room have a steady temp around 20-22˚celsius.
The sound is as always very very good.
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