Unfortunately the Jaybird X3s make a constant very noticeable white noise (hissing) whenever they are active. The noise completely ruins listening to audio books and is only drowned out by loud music.
I assumed this was a single defective Jaybird X3 unit. However after getting a replacement unit, it had the same issue.
The issue occurred on both units straight out of the box, and was not resolved by factory resets. I was pairing with an iPhone 6s, running iOS 10. The hissing was also audible for several seconds when turning the headphones on, even when my phones Bluetooth was off.
I previously used the Jaybird X2s on a daily basis for over a year and a half and never noticed any static / white noise / hissing. I was a big fan of the Jaybird X2s and wanted to enjoy this product as much as the previous generation.
If anyone from Jaybird reads this, is this a known issue with a faulty batch? If so I would consider buying a new pair when the issue is resolved. Otherwise I think I need to look elsewhere.