I've gotten the Inspiron 7567 with i7, 1 TB HDD and 256 GB SSD.
It always make a high pitched popping sound on headphone port, before and after playing the sound. I think it should be Realtek HD Audio power management problem. I uninstall the Realtek Driver and use windows original high definition audio driver which solved this problem. I can not always use Windows original high definition audio driver, because it doesn't support like select the headphone type, Maxxaudio.
I have tried to use all solution on post: http://en.community.dell.com/support-forums/laptop/f/3517/t/19658420 but not work, including change the regedit ,install other version Realtek driver , stop auto startup of Maxxaudio.
Solved! Go to Solution.