Page 1 of 1

Problem with JBL EON PA System Speakers - Help Please!

Posted: Sat Jan 15, 2011 8:07 pm
by rharris07
Ok - so I have the JBL EON 10 left and right speakers as output from a DBX DriveRack PX, with a mono sub also running out of the DriveRack. I am feeding my macbook into the DriveRack inputs for audio signal.

The problem I'm experiencing is that the left EON 10 has full range of sound, while the right EON 10 has no highs...it sounds as if a low pass filter is turned on half-way...all highs are cut out, and its basically just midrange only.

I've tried replacing the cables, I've tried EQing thru the DriveRack...I've switched the speakers out, nothing changes it at all. I've read thru both the DriveRack and the EON10 manuals and neither mention a problem like this at all.

I've listened to the speaker alone - it seems to distort a little bit easier, possibly due to being in midrange only, but it never sounds like the speaker has been blown. h**l I've not even turned these speakers on in a full year...they've been safely stored under a desk, where nothing touches them and they stay within reasonable room temperatures. They were used for this same dance last year, and worked perfectly all the way thru the night, and they were tested the next morning to ensure they made it home safely. At that point, they were stored and never used since.

Does anyone have any ideas? I'm needing to use this system tonight for a dance, and it sounds rather strange to have highs coming from one side, and mids from another. I would really appreciate any ideas on things to check, try out...anything might help!

Re: Problem with JBL EON PA System Speakers - Help Please!

Posted: Sat Jan 15, 2011 8:10 pm
by tallowwaters
Your driver is dead or a cap or inductor is blown in the crossover.

Can you take it apart? I can help you diagnose everything if you don't mind doing a little tech. It's nothing extensive, just approximately soldering 4 or 5 things, usually through board and terminal stuff.

Re: Problem with JBL EON PA System Speakers - Help Please!

Posted: Sat Jan 15, 2011 8:43 pm
by rharris07
Here are iphone pics I just took of the JBL EON opened up...does this help point out anything that I could check?

Image
Image
Image
Image
Image

Re: Problem with JBL EON PA System Speakers - Help Please!

Posted: Mon Jan 17, 2011 2:46 pm
by tallowwaters
I can't look at a drive and know if it's dead or if it's a smoked cap in the crossover. Sorry if the following sounds condescending, I'm not sure of your amount of previous knowledge here.

First confirm if no sound is coming from the horn. This is pretty easy to figure out, just put your ear up to it. If no sound is coming out, likely the case, try this -

Try jumpering from the input straight to the driver (the smaller 'speaker' up top), or just take the wires from the amp and put 'em on the terminals of the driver. You're just doing this for a second to confirm if the driver is blown, obviously you don't want to this for any extended amount of time. Obviously you want unplug from the wall first. If the driver produces sound, then it's your crossover circuit that needs fixing, which I am assuming is behind that metal plate. It'll likely be a little yellow oil film capacitor, easy to find and replace.

*disclaimer* I have never worked inside a JBL Eon, but I doubt these guys are reinventing the wheel.

Re: Problem with JBL EON PA System Speakers - Help Please!

Posted: Tue Jan 18, 2011 8:30 am
by rharris07
Unfortunately I'm out on the road for the week, so I won't be able to check back on the speaker until Friday or Saturday....but I will say I have absolutely no experience in any of the stuff you've talked about...so I wouldn't really know what I"m doing, though reading up on it and getting some tips would help make it a little less impossible for me...so I definitely will try what you suggested and see if that tells me anything.

Thank you for the tips!

Re: Problem with JBL EON PA System Speakers - Help Please!

Posted: Tue Jan 18, 2011 1:03 pm
by tallowwaters
After a couple of fiascos recently, I've become minorly proficient at working with PAs. Aside from actually getting the components out of the cabinets without messing up the stuffing, they are actually pretty easy to work with.