I also got the same issue on both my EON712 and EON715 after the latest update 6.2.1.0. This sound is really annoying!! Please JBL - can you fix this issue asap - please!
I just updated to firmware 6.2.4.0 and noise is gone. I almost sent them back to Sweetwater. I'm glad I waited and saved the shipping costs. Thanks for listening and fixing, JBL.
Answers
https://youtube.com/shorts/GjJrUT0AEJE?feature=share
I did a firmware update on my 3 EON712s today and they all make this noise now.
https://www.youtube.com/watch?v=DIlQJCBz4Ys
Same issue here since last firmware update to 6.2.1
I just updated to firmware 6.2.4.0 and noise is gone. I almost sent them back to Sweetwater. I'm glad I waited and saved the shipping costs. Thanks for listening and fixing, JBL.