Speaker emits high pitched sound when plugged in, but not when on Bluetooth.

I have a Bluetooth speaker that can also be hardwired. When I plug it into my PC, it emits a high pitched sound. But when I use it for my phone via Bluetooth, it sounds fine. What could be causing the high pitched sound when plugged into my PC? Note that my PC doesn't have Bluetooth and that's why I have to plug it in.
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Kat DoneganUX/UI DesignerAsked:
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JohnBusiness Consultant (Owner)Commented:
Two possibilities (and there may be more).

Power to the speaker from the PC may be causing the speaker coils to squeal (the wires can move so slightly).
The frequency response of the PC may be higher than the phone but not pure causing a squeal noise rather than music at the high end.

Is the speaker a known very good brand?
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Kat DoneganUX/UI DesignerAuthor Commented:
It's called UE Boom and I got it for free a couple of years ago so I've been using it ever since. Not sure if it's a good brand. It seems to have good reviews, and it works perfectly via Bluetooth. I was also thinking the aux cord could be the problem but I'm not sure.
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JohnBusiness Consultant (Owner)Commented:
Perhaps get a larger gauge cord to make sure it carries the full power supplied by the PC. Losses in the cord could lead to change in frequency response which could then lead to the squeal.

You can get a Bluetooth adapter for your PC and since you know it works to your satisfaction on Bluetooth, this may be the best solution in your case.
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Kat DoneganUX/UI DesignerAuthor Commented:
Which cord would you recommend? And since you mentioned it, which Bluetooth adapter would you recommend? This is a gaming PC so it's quite a beast.
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JohnBusiness Consultant (Owner)Commented:
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Kat DoneganUX/UI DesignerAuthor Commented:
Ok thanks! I'll try getting a better cable and a Bluetooth adapter and let you know how they work out.
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David Johnson, CD, MVPOwnerCommented:
i think you are experiencing feedback, disable your microphone or enable echo cancellation in your microphone.
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Kat DoneganUX/UI DesignerAuthor Commented:
I don't have any microphones enabled. I should also add that the high pitched sound isn't present when first turning on the speaker. The high pitched sound begins once I start to play audio through the speakers, then stays until I turn the speakers off.
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David Johnson, CD, MVPOwnerCommented:
try moving the speaker a bit further away (I still think it is feedback)
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Kat DoneganUX/UI DesignerAuthor Commented:
I can't really move it away because the cord is too short and it needs to be plugged in because my PC doesn't have Bluetooth. I moved it as far as it can go and the noise is still there.
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JohnBusiness Consultant (Owner)Commented:
Thanks. Please let us know when you have the Bluetooth adapter and new (longer?) cable.
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David Johnson, CD, MVPOwnerCommented:
is this a laptop or a desktop, if a laptop put a piece of tape over the microphone
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arnoldCommented:
Feedback or interference due to poor grounding.

potentially cabling is an issue, but a USB bluetooth adapter can be had rather ... get the latest Bluetooth version...
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Lucas BishopClick TrackerCommented:
As others have said, likely related to poor grounding.

I'm assuming this could mean either the wall outlet, power-strip, power supply, motherboard (on-board audio) or soundcard itself aren't grounded well.

The first (and easiest) thing to try is plugging your computer into a different outlet.

Using a "power-strip?" Try not using it. Try using a different one. etc

The screws that hold your power supply to your case - Are they painted? Are they screwed in tight?

Does your pc have onboard audio, a separate soundcard, or both?  Try plugging into each one to see if the issue goes away. Have a different soundcard you can test in the pc?

Are you plugging into an audio jack on the front/back of the pc case? Is there a different jack you can try?
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nobusCommented:
hey Kat - check if the volume is normal - and check the eaqualizer settings too - too high amplification can cause it also
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Kat DoneganUX/UI DesignerAuthor Commented:
Sounds possible. I'll check all these when I get home! The Bluetooth adapter should be arriving tonight as well so I'll see how that works.
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JohnBusiness Consultant (Owner)Commented:
Seems like you got it working - Thanks.
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Kat DoneganUX/UI DesignerAuthor Commented:
Looks like a Bluetooth adapter did the trick! Something about it being wired into my PC was causing the noise. It's in the same spot it was with no other changes except it's being used via Bluetooth. Thanks everyone!!!
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BillDLCommented:
Am I correct in thinking that the speaker has a built-in microphone designed to make the unit work as a "speakerphone" when connected to a mobile phone?  I have my suspicions that this is enabled and causing feedback, just as David Johnson suspected the squealing is being caused by feedback.
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Kat DoneganUX/UI DesignerAuthor Commented:
The speaker doesn't have a microphone. I tried to reduce the feedback the best way I could but it still wouldn't work. So far the Bluetooth adapter solution has been working amazingly.
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