I just got my hands on some L300's and am trying to learn as much as possible. My serial numbers are pretty far apart (17419 and 18942) and I have noticed that in addition to the front cabinet decals being different, when I look into the mid horns the earlier serial number speaker's horn has a wire mesh screen covering the diaphragm while the later serial number speaker has some sort of plastic yellow piece inside the horn? Did JBL modify the construction of these horns as time went by, or is this a mod done by the previous owner? I haven't been able to listen to them yet so I am unsure of how this may affect the sound?
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