Question about JBL 5.1-Channel Home Theater Speaker System with 150W Subwoofer

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Jbl sub 150

Hello , my sub sometimes has a loud high pitched whistle sometimes. Even if everything is unhooked from it.

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  • Anonymous Oct 18, 2008

    I have the same problem. It whistles and goes in and out. No wires hooked up to it.

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Make Sure you have your Audio cables Connected right. Meaning Red with Red and White with White.

Posted on Oct 04, 2008

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1 Answer

Jbl flip makes buzzing noise when turned on


I have the same problem. But after a short time it stops even in battery mode (i.e. unplugged). Did you find a solution in the meantime?

Jan 12, 2013 | Harman Kardon JBL Flip black

1 Answer

Subwoofer makes high pitch whistle when turned on. Blown tweeter?


Subwoofers don't have tweeters and NO speaker makes spontaneous sounds unless it's mechanically breaking apart - then it dies and is silent.

I'd look for an electronic component that's blown. No one online can do that part for you.

Then you can say, 'oh, I see (something blown)' and spend time and money obtaining and replacing the low-hanging visible fruit only to find that the ROOT cause is not visible and you still have a problem.

OR let a hands-on tech take a look at it.

Jun 07, 2011 | JBL SCS160SI System

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I purchased a JBL PB12 (120v) subwoofer from a friend. It worked excellent for a month or so, but completely went on the fritz yesterday. Whenever I turn it on, I get a loud whining noise, that starts high...


It sounds like something on your main board of your amp is going out. It is most likely the finals, or as you said a capacitor. Test the port with another speaker, if al is well then the wooferis bad. if not you will have to go inside the amp for repair. Depending on the brand it can be a little complicated. Try and narror it down to the proper componet, post back the results and we will go from there. Also is this sound comming from all channels or just the woofer?

Sep 28, 2009 | JBL PB12 Subwoofer

1 Answer

My amp!


you may not have a big enough power wire to it, and it could also not be grounded good. You have to know the limits of your amp too. They are rated by Ohms of stability. Most amps that small are only stable down to 4 ohms. Most subs have 4 ohm coils, but there are also double coils, and 8 ohm subs. You will need to know the ohms on your subs. If you load your amp down to a lower ohm load than the amp is capable of handling, then it could also cause this.

May 06, 2009 | JBL SF25 Main / Stereo Speaker

1 Answer

JBL d110 /w no sound output


There is a standby indication that activates after 10-15 minutes without any input signal. I suspect that might be what the red light is telling you - no signal.

Loud hum from a loosened cable is normal as hum usually means there's an ungrounded connection somewhere acting as an antenna and the amp is doing its job to amplify what it thinks is a signal, in this case 60hz stray ac current is being sensed nearby. It's a good sign that you get hum from the sub because that means the amp is alive.

Avoid manipulating cable connections with the Sub or Receiver turned on as you could introduce a static spike that could harm any connected equipment.

Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.

Or, just hang a CD player on the Inputs of the sub and play something with a reassonable amount of Low Frequencies.

>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<

A living sub will produce only muffled rumble in the absence of other speakers producing the higher frequencies which carry the intelligence of the signal. If that works, back to the receiver for settings. If not... sigh.

-----

For hum problems, even those you cause yourself:

Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.

Sometimes the reversing the orientation of the AC plug can help with hum. Or it could be something like a loose or high resistance connection internal to the sub. Good luck.

Jun 17, 2008 | JBL PSW-D110 Speaker

1 Answer

Subwoofer not powering enough (Sounds like under powered 8inch)


get a nice monster subwoofer cable and a Subwoofer PowerCenter™ SW 200 with Clean Power™ Stage 1 get it from like amazon and you'll definately see a difference and also put the sub in like a corner

Jun 08, 2008 | JBL S120PII Subwoofer

1 Answer

Thump at the time of shutoff


The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.

Mar 07, 2008 | JBL PB10 Subwoofer

2 Answers

PB10 Loud Hum and Crackle- LED Lights mixed Red/Green


Hello, Jesse. I doubt I can help, but there is at least one SIMPLE thing you can try - with maybe a 10% chance it wil return your unit to normal: Unplug the unit for 30 seconds, then plug it back in to a DIFFERENT outlet. Oh, yes - there are NO fuses or other "reset" devices. I'm sorry I couldn't offer you more help.

Jul 25, 2007 | JBL PB10 Subwoofer

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