Hello,
i have a pair of JBL 4627's ( the 4627, with a E145-8 and the 2901A High-Frequency Power Pack, a 2410 compression driver on the 2301 perforated-plate horn-lens with a high-pass network.) and I cannot hear anything out of the high frequency speakers.
I thought I would just take them apart and have a look inside to test the drivers etc. but for the life of me I cannot figure out how to open them up! I have managed to remove the front grill and was able to remove the screws holding the horn-lens and driver but it is still "stuck"
and other than being able to get my arm into the tuning holes, I cannot inspect the speakers
or anything else. i have a pdf drawing of the enclosure and all it's parts but I still cannot figure out how to open it. If I remove the corner protectors will I find screws? Please help!! Also what do those turnable knobs do (L-pad)?
Many thanks and any ideas of why I do not hear high frequency horns would be helpful.