Solved: Noise in audio line-out when connected to an external video (DVI)

Ok. I kept looking for possible solutions to this problem. I finally found the solution! If you lift the ground out of the audio cable, completely disconnect the ground conductor, unsolder it, cut it.. the noise goes away. Here's why I had the problem in the first place. Common practice wiring when going from unbalanced to balanced, or from a two conductor+ gnd (stereo) to two mono+ gnd, calls for a specific wiring with the ground/shield conductor. (BTW, most commercial audio cables like those sold in the Apple store will exhibit this problem: e.g. any 1/8" stereo to L/R mono RCA or 1/4" connectors) If you disconnect it, running just the signal conductors, you isolate the systems' grounds. This seems to fix the problem.
To Apple's credit, after looking for some information on the audio specifications of the MacBook Pro, I found in the developer's section the Audio Developer Note for the MBP in which the following was stated:
"For best results, equipment plugged into the line/headphone output jack should not connect the audio ground to other grounds, such as the chassis or "green-wire" ground."
I hope this helps others.
Apple: Take notice. Please print this info in the user's manual to avoid some disgrunted users!

Ok. I kept looking for possible solutions to this
problem. I finally found the solution! If you lift
the ground out of the audio cable, completely
disconnect the ground conductor, unsolder it, cut
it.. the noise goes away. Here's why I had the
problem in the first place. Common practice wiring
when going from unbalanced to balanced, or from a two
conductor+ gnd (stereo) to two mono+ gnd, calls for
a specific wiring with the ground/shield conductor.
(BTW, most commercial audio cables like those sold in
the Apple store will exhibit this problem: e.g. any
1/8" stereo to L/R mono RCA or 1/4" connectors) If
you disconnect it, running just the signal
conductors, you isolate the systems' grounds. This
seems to fix the problem.
To Apple's credit, after looking for some information
on the audio specifications of the MacBook Pro, I
found in the developer's section the Audio Developer
Note for the MBP in which the following was stated:
"For best results, equipment plugged into the
line/headphone output jack should not connect the
audio ground to other grounds, such as the chassis or
"green-wire" ground."
I hope this helps others.
Apple: Take notice. Please print this info in the
user's manual to avoid some disgrunted users!
Great Job! I fixed my whine on my new 17" MBP but no one cares, oh well I am happy!
William

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