iPhone 6s Distorted Sound

Hello All,

I have just received my iPhone 6S (iOS 9.0.1) and i'm really enjoying the new features, however I've noticed that when I have my Ringer Volume turned up full there is a slight crackling/distortion when playing sounds from the bottom external speaker.

The best way I've found to reproduce this issue is by going into settings, turning the ringer volume to full (having the ringer volume anything below full will stop the distortion) and then playing the ringtone "Opening", the speaker will make a minor distorting sound at the high points of the ringtone.

I've spoken to a friend who has a 6S Plus and they have reproduced the same issue, I would like to ask if anyone in the community could try the ringtone above and let me know if they get the same problems with the speaker?

Thanks in advance

Craig