Question about Jabra C820s Headphones

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Jara C820 Headphone was working correctly but as soon as the noise cancelling feature is turned on, the left headphone emits a high pitched noise when in close proximity to an object such as ear/head or flat hand.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 537 Answers

SOURCE: No sound in right ear

Check for a loose connection in the wire. Wiggle (carefully) the wire around both the headset where it sits on your heat. Also, check the other end (plug) to see if there are any shorts. If this simple "wiggle" test shows nothing, there may be a problem with the driver (speaker) in the right channel in your headphone.

Another thing to check and this should be obvious: make sure your balance on your stereo/receiver is set to be in the middle and not to the left.

Mike

Posted on Nov 21, 2007

  • 50 Answers

SOURCE: Bose in-ear headphone cord cut

most head phones there two wires. those are the two that you most likly put together. if there is any metel mesh covering the wires. that has to be connected also.

Posted on Jun 20, 2008

  • 11 Answers

SOURCE: Right Bose In-ear cord separated from headphone

i know that these are very exspencive headphones, they were 100 dollars, and they are great. unfortunitally, these cannot be fixed without getting new headphones, sorry!!!

Posted on Aug 27, 2009

cseian
  • 138 Answers

SOURCE: The sound coming from my right bose on-ear headphones

i think ur headphone wires or its pin at end will be defective..
99%there is no chance of failures in speakers ..
try to replace ur headphone cable with new cable.
just solder the cable with speaker inline pins..


Posted on May 25, 2010

Messic
  • 94 Answers

SOURCE: First i was having issues with the sounds

I would recommend that you do not plug in noise cancelling headphones to the jacks ON your speakers. Plug it in directly to your source and you should not face this problem.

Posted on Mar 08, 2011

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There is constant static in the left ear when the noise cancelling is turned on. The only way to solve this is to turn the noise cancelling feature off. Is there another solution?


these things are suppost to have a little static noise when on. next time get noise reduction headphones. they are like headphone style ear protection like what construction workers use. but only more stylish and they contain speakers. and no killing batteries for good sound. they are regular headphones but with really good sound isolation

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The high pitched noise is coming from the Tcon board. It is not properly decoding the signal coming form the main board correctly. The only way to fix it is to replace the Tcon board. You might have a hard time coming across the part because Olevia has since gone out of business. Also, usually Tcon boards are not available sepertaly and most manufactures make you purchase the whole LCD panel of which the Tcon is included.

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Bose QC3 makes a high pitch noise when i press it against my ear


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a siginficant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs. When you press the earcup close to your ear, you are changing the size and shape of the air chamber inside of the earcup thus directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback. Removing your hand from the earcup should restore the shape of the air chamber allowing the circuits to return to normal operation.

If the feedback occurs too easily when you are NOT pressing on the earcup, then the foam may have weakened/deteriorated and it may be time to replace the ear cushion.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

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