https://community.sony.cz/t5/portable-audio/sony-wh1000xm4/m-p/3903897#M12750 <P>Is there any other signals in the area that might affect it? Any waves?&nbsp;<BR />Does it happen with different devices? I'd check the software as well to make sure it's up to date through Headphone's connect app.&nbsp;</P> Fri, 17 Feb 2023 14:48:52 GMT Anonymous 2023-02-17T14:48:52Z https://community.sony.cz/t5/portable-audio/sony-wh1000xm4/m-p/3903592#M12742 <UL><LI>Hi, I recently purchased these excellent headphones but when the ambient sound control is turned on I get a crackling sound followed by a loud, high pitched screaming noise. Very unpleasant. It stops immediately when the ASC is turned off..! Any ideas anyone? TJ</LI></UL> Wed, 15 Feb 2023 00:12:19 GMT https://community.sony.cz/t5/portable-audio/sony-wh1000xm4/m-p/3903592#M12742 Timjones 2023-02-15T00:12:19Z https://community.sony.cz/t5/portable-audio/sony-wh1000xm4/m-p/3903897#M12750 <P>Is there any other signals in the area that might affect it? Any waves?&nbsp;<BR />Does it happen with different devices? I'd check the software as well to make sure it's up to date through Headphone's connect app.&nbsp;</P> Fri, 17 Feb 2023 14:48:52 GMT https://community.sony.cz/t5/portable-audio/sony-wh1000xm4/m-p/3903897#M12750 Anonymous 2023-02-17T14:48:52Z