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Static sound coming from the Thunderbolt Display speakers

I have bought a new Thunderbolt Display and connect it to the 2011 MacBook Air. Both latest Firmware updates has been installed, for the MBA as for the Thunderbolt Display. Each time I play a media with some audio (music or video) and stop, the speakers are emiting a static humming sound for about 30-45 seconds and stop. I can hear the humming sound starting once I star the music or video, but it gets cover by the media playing.


Anyone has this problem?


My display is still under the 14 days period trial, so I would probably just bring it back and take another one, but as no one as discuss this problem, I want to know if I'm alone or not.

MacBook Air, Mac OS X (10.7)

Posted on Oct 4, 2011 5:36 PM

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126 replies

Jun 30, 2012 8:20 AM in response to JiPĂ©

Myself, I've given up for now, but I did get the 3-year warranty on the display. Close to the end of the warranty, I plan on raising ****, and getting a 'new' display. Will make Apple pay a bit for not fixing this issue, at least in my book. I like Apple, but do not like when they do not recognize and fix issues with their hardware.

Jun 30, 2012 8:28 AM in response to JD1991

As far as I know, ALL TB displays are like this. I have not seen anything that counters this claim. I think most people don't notice it because of environment - if is is somewhat noisy or more, you won't notice it much. Where I have my display, their is little noise, so it stand out like a sore thumb. I went through three displays with Apple, and they ALL had the same issue.

Jul 27, 2012 8:08 AM in response to JiPĂ©

I very much think it is a hardware issue. Something to do with the "baseline hiss" of the amplifiers built into the display. And the way the display's (or Mac's) system switches those amplifiers on (when the audio signal starts) and off again (a couple of seconds after the sound signal ceases).


I guess modifying (i. e. shortening) the time until the amplifiers are switched off again could help with the problem (i. e. the "hiss" is shorter), however, this wouldn't fix the underlying cause of the problem (i. e. "hissing" amps).

Jul 27, 2012 8:24 AM in response to JiPĂ©

For completeness. Mine takes a variant amount of time to occur. Increases slowly over time once it does. It's not limited to any one audio source on my computer, but happens to all (rdio, iTunes, etc). Stopping the audio for an (also seemingly variant) amount of time fixes the issue.


Occurs whether or not I have external devices plugged into the display. Connecting the same MBA to a Pre-Thunderbolt ACD does not result in any audio issues. (Though I believe the USB transmits the audio on the ACD setup, so it could still be limited to Thunderbolt on the Mac)


I only have one Thunderbolt display here, so I haven't been able to test it on others. Apple support had me reset PRAM, and SMC, which seemed to help (prolonged the length of time before the static occurred) but after an hour of audio it became apparent it had no effect.

Static sound coming from the Thunderbolt Display speakers

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