Loudspeakers - Speakers emitting high frequency....

[Thefoxygranpa]

Hello!

My JBL powered speakers [prx515 and prx518] are making nasty noises. They emit a very high frequency when powered on. I would say above 14kHz. The tone is a steady volume until I run a signal to the speakers, and when that happens that particular frequency is amplified as well. I'm stuck on what it could be.

I've tried to reset the breaker that they are on, as that solved the problem once before, but only for a short time. I should mention that these speakers are flown...

Now I think that isn't even near enough info to assess the situation...but let me know what more info you would like and I would gladly tell you, this frequency is bugging me!

[avare]

Do they buzz when there is no input cable hooked up to them?

Andre

[Thefoxygranpa]

Originally Posted by avare

Do they buzz when there is no input cable hooked up to them?

Andre

Yes, they do.

[Eboy87]

So, for reference, you plug in the power cable, power on the speaker, and you get this noise. Is it a ringing or a buzzing noise? If it's a buzz, did you try different outlets? As you said, this only happens when they have no input cable plugged in, which says to me it's either a power issue or an amp issue.

If it's a problem in the amplifier or speaker itself, send it back to JBL (or Crown, whoever repairs those) and have them look at it.

[avare]

As Ian wrote, send them back. There is a problem with them.

Andre

[SHARYNF]

Usually it is a capacitor going bad, definitely get them repaired
Sharyn

[Thefoxygranpa]

Just an update to what happened....


I have found it is only one speaker that is emitting this frequency. I took it down and brought it to another room and plugged it in there....after about five minutes it starts to emit this frequency. Now this is with nothing else but power plugged into the speaker.

Bad crown amp? I think so...have contacted the guy I bought them from, but the fact that fly points were installed...would that void my warranty?

[and my apologies, delete this post if my reference to fly points is a no-no!]

[cjthedj]

definately send them in!

[TimmyP1955]

Tis very foolish to install flypoints on a loudspeaker. Should something fail that causes an injury, the whole of the liability will be yours, as you flew a box that was not designed and constructed to be flown. There's more to making a box flyable than just the addition of flypoints.

[Thefoxygranpa]

Originally Posted by TimmyP1955

Tis very foolish to install flypoints on a loudspeaker. Should something fail that causes an injury, the whole of the liability will be yours, as you flew a box that was not designed and constructed to be flown. There's more to making a box flyable than just the addition of flypoints.

For the sake of breaking CB rules I won't discuss the why/how I installed the fly points and safety measures. My main point of this topic was to discuss my malfunctioning speaker, my apologies if this raised any eyebrows....

As for my speaker it has to be taken to Philadelphia and from my last update the technician couldn't pinpoint the problem .