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MikeLtheDJ
04-14-2012, 05:39 PM
Has any one have an issue like me?
I'm running 2 prx 515 as my PA system for my DJ service. So what's happening is that one of the speakers would play at a normal volume and all if the sudden it drops its volume. There is sound coming out but at about 90% less volume.
I'm always very careful to away from the red on my mixer (djm 350), I typically don't give pass the first orange light. The speaker volume on the back is set at about 1 or 2 o'clock.
So I know I'm not clipping and distorting anything.
I've tried multiple cables, different mixers, different power cables.

Anyone with a similar problem?

Any help would be greatly appreciated.
Thank You
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windspeed36
04-14-2012, 06:03 PM
Is it dropping when you increase the volume past a certain point? I'd take it in to JBL

bumpyjonas
04-14-2012, 11:47 PM
I own several JBL powered speakers, never had that issue, as windsppeed36 indicated take to JBL and let them troubleshoot the issue.

MikeLtheDJ
04-15-2012, 06:36 AM
Ok, thank you ill get it done. The only thing I hate is that the closest repair shop that will take a look at it is almost 2 hours away.

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Evil Steve
04-15-2012, 11:39 AM
Have you tried changing the speakers side for side? Does this problem exist only with one speaker, or does it change when you swap left for right?
Looks like you checked the silly things, like cables. Have you gone all the way thru the signal chain, including source into the mixer?
In other words, are you sure it's a problem with a speaker, and not a problem somewhere else?
I would hate to see you waste two hours or more, only to find out the problem isn't with your speaker, but somewhere else in the signal chain.
Don't mean to ask stupid questions. Just thought I'd throw it out there...

MikeLtheDJ
04-15-2012, 05:45 PM
Have you tried changing the speakers side for side? Does this problem exist only with one speaker, or does it change when you swap left for right?
Looks like you checked the silly things, like cables. Have you gone all the way thru the signal chain, including source into the mixer?
In other words, are you sure it's a problem with a speaker, and not a problem somewhere else?
I would hate to see you waste two hours or more, only to find out the problem isn't with your speaker, but somewhere else in the signal chain.
Don't mean to ask stupid questions. Just thought I'd throw it out there...

Yes I've check that. I also tried a different source. I use a Numark hdmix as a backup.
I'm guessing its not a common problem.

Thank you all for the reply

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Coronaoperator
04-15-2012, 08:26 PM
It sounds like it may be thermaling out on you (overheating). The JBL prx 515's are famous for that, bad heatsink design. I own 2 of them and the solution that the JBL dealer provided for me is shown in the following picture.
http://img813.imageshack.us/img813/5375/medicinehat201203280012.jpg (http://imageshack.us/photo/my-images/813/medicinehat201203280012.jpg/)

The solution is a 4" computer fan mounted on the wall blowing air onto the heatsink. Works perfectly now. Getto but there is nothing else that works. I'm willing to bet you have the same problem.

JBL knows about this problem but refuses to admit to it less their reputation gets damaged. That is why they quickly discontinued that line and replaced it with the 615's series. It is a design flaw that they won't own up to.

MikeLtheDJ
04-16-2012, 06:42 PM
Wow that's great ....

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MikeLtheDJ
05-02-2012, 07:52 PM
So after beeping at the repair shop for over a week, they can not reproduce the issue. My warranty runs out in September. Any suggestions?

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MikeLtheDJ
05-02-2012, 07:54 PM
I need to mention that this only happens after a long time being on. I wonder if there is such a thing as a duty cycle on them.

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Coronaoperator
05-02-2012, 09:07 PM
OVERHEATING

The techs ran mine all day on the floor and they never cut out once. Mine arn't mounted on the floor, they are mounted up high touching the ceiling near the dancefloor. The temp at the ceiling easily hits 120'F after a few hours of people dancing.

Your options are to trade them, sell them, or find a way to cool the heatsink. A small 4" computer fan is plenty.

MikeLtheDJ
05-02-2012, 09:51 PM
I just may have to do the computer fan. I love the way they sound.
Thank you

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