WH-CH700N noise/hissing * when using cable *

[FrankieSomeone]

Here's a new one, bluetooth and noise canceling are working perfectly, but when I plug in the aux cable, there's a soft constant noise/hissing, independently from the audio source - I also hear the same noise when the cable is only plugged into the headphones and the other end is loose.

These are brand new and I only used them maybe once with the cable, and I don't remember them doing this then. I might have updated them after using the cable but I can't be sure. Tried a factory reset but nothing changed (also the firmware doesn't get rolled back)

[Sean_Mc]

Hi Frankie,

Welcome to the Sony Community.

Can you let me know what kind of device you are using?

Best wishes,
Sean 

[FrankieSomeone]

Hi,
this happens regardless of what device I'm connecting the headphones to; I can hear the same noise even if the other end of the cable isn't plugged into a device.

[The_Black_Rose]

Hi FrankieSomeone,

That's so unusual. Have you tried a different cable?

Cheers,

Rose

[FrankieSomeone]

Yep I tried another cable and the wooshing is still there. It's like a soft static noise.
Meanwhile, audio via bluetooth is crystal clear.

[The_Black_Rose]

Hi FrankieSomeone ,

Have you tried resetting the headphones to factory settings as explained here: https://helpguide.sony.net/mdr/whch700n/v1/en/contents/TP0001613432.html

Cheers,

Rose

[FrankieSomeone]

Yup I tried but it didn't help. Today I also tried using them cabled away from my house in case it was interference from power lines or some such, but it wasn't that.

[The_Black_Rose · Accepted solution]

Hi FrankieSomeone ,

If you turn the headphones off ( noise cancellation off ) when they are connected via cable, does the same thing happen?

Cheers.

Rose

[FrankieSomeone]

Oh my god, that's what it was! For some reason I was totally convinced that the headphones needed to be turned on to work via cable.
Yeah with the headphones powered off there's no noise. Thank you!

[The_Black_Rose]

Hi FrankieSomeone ,

Glad it's working now!

Cheers.

Rose