For some reason, i was playing with my ringtones settings on a replacement iP4 and I noticed that there was speaker distortion on this one. If you have an iP4, go to your sound settings, turn your volume way up. Does Marimba or Tri-Tone play with distortion towards the end? Mine plays with distortion (sounds like the frame or something of the phone is vibrating) until I go down to maybe 70% Again, on my original launch day iP4 I never noticed this. Is this problem common? I ran a search and found out that it was pretty common with the 3GS but is it common with the iP4s? Edit: I noticed it only happens with the ringtones and NOT with music that has been turned up all the way. I even put on some screamo to try to make the distortion sound and I couldnt do it.