Question about JBL PRX515 Speaker

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My JBl PRX 515 has stopped functioning correctly. The high works but the low doesnt. It wasnt over driven or even clipping. There is no funny smell or odor that appears when a speaker has been blown. Wierd?

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Your speaker is an active one. This means that it has indepented amplifier for low and high frequencies. So maybe the woofer (low speaker) is still active but its amplifier is defective. In order to make things more clear take a look at this block diagram to understand the signal flow:
my JBl PRX 515 has - 618c931.jpg
I suggest you to unscrew the screws at the back panel and eject the whole electronics from the inside:
4956ee9.jpg
Take care the cables that connect the electronics with the speakers. If it's easy mark what goes where and unplug these cables. Now with the electronics on the table try to locate fuse(s) that may have been blown; since you don't smell burned components, fuses is the most common problem. Replace any blown fuse with the same one and put things back in the proper order. In case that you don't locate any fuses the problem is at components and I can't be sure if you can manage replacing components.

In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution.

Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114

Posted on Sep 13, 2010

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