hi Everyone, Just got my iPhone X today and soon enough i found myself googling for 'apple iphone x voice issues' and i found this thread.
I too hear this crackling sound from the speakers near the earpiece when i listen to audio or having a call over speakerphone and the volume is around 80-100 pc. I have updated to the latest version of iOS 11.1.2 but the issue is still there.
The song that i sampled was "Can we make it work" by "The Mountains". I tried listening to this song from two apps, Amazon Music and Youtube. I compared the sound with my iPhone 6s Plus on the same apps. The crackling noise is there. The first few seconds of the songs, and you'll hear it.
Contacted Apple support over chat. The first advisor asked me to perform normal stuff, such as playing the song with the bluetooth radio on and then off. Listening through headphones and such. Then he transferred me to a senior advisor.
She asked me to press both volume up and down button and the sleep/wake button for about half a second which made the phone to vibrate a bit. She said the phone is now in sysdiagnose mode. She told me to wait for ten minutes and then connect my iphone to a computer with iTunes so as to sync the phone and then send the log files over to apple, which i sent(via the link they sent me on my apple id, approx 130 MB zip).
At the end i told her that there are many of us facing the same problem and that i hope its a software issue to which she said, "That's what we are going to find out. the logs will be sent to our engineers. You will get a reply within 3 days, if not connect with us with the case number and my colleagues will be able to help".
Hopefully we'll get to know more on this soon.