Currently Being ModeratedFeb 15, 2011 12:35 AM (in response to camsibearrr)I have the exact same issue.
Whether use my iPhone's headphones or noise cancelling Bose headphones. Same thing.
I hear lots of different noises. It is especially loud, when Safari is downloading a File.
The noises are in synch with actions taken, e.g moving the mouse, opening windows, moving them, etc.
I guess it's just poor engineering of the frontal headphone jack. Maybe an em-interference problem.
The back line out doesn't have this problem. No noise whatsoever.MacPro 2x2.3 GHz (Nehalem), 120GB SSD, 6GB RAM, Mac OS X (10.6.6)
Currently Being ModeratedApr 18, 2012 1:40 PM (in response to camsibearrr)
I too have the same issue.... Im using klipsche promedia headphones
Currently Being ModeratedOct 25, 2012 2:05 PM (in response to camsibearrr)
I had the same issue.
The fix for me was to go to Utilities/Audio MIDI setup and configure the "Build-in Output" output format to "2ch-32bit Float". In fact 2ch-24bit Integer made the hiss almost disappear already.
On my system, it was set to 2ch-16bit Integer.
Currently Being ModeratedFeb 17, 2013 6:40 AM (in response to camsibearrr)
The problem remains at the latest macbooks and the up-to-date OS. I have the same issue on MacBook Pro 13.3 Retina.