True Stereo Left and Right Separation from Mac

Hello All,
This is quite long so please be patient.
I am trying to figure out if there is a way to get "true" left and right playback for split tracks through iTunes. By "true" I mean that neither the right track bleeds through the left or left through right. I use a lot of split tracks in our church and am trying to do it straight through iTunes.
I tested it with a stereo feed coming from the headphone jack to two independent speakers playing through iTunes. The instruments come out the right and the vocals come out the left. When I unplugged the left speaker (vocal) I could hear the vocal bleeding through the right speaker.
To further test this I burned a CD of the same song, played it through a stereo and could separate the left and right audio. I played the same CD through iTunes and unplugged the left speaker and could hear the vocal bleeding through the right speaker.
One last test, I opened Quicktime and selected the same track from the CD, played it through Quicktime, unplugged the left speaker and the vocal did NOT bleed through the right speaker.
So lesson learned, unless I am missing something - iTunes cannot really separate left and right signal from mp3's on the hard drive or burned audio on a CD.
By the way, if anyone knows how to accomplish this true split I would be grateful to hear it.
Thanks,
Greg

Ok.... I did some further testing.
I went back and noticed that in preferences under playback there is a checkbox for sound enhancer. With this checked you will get bleed of the left channel into the right channel. With it unchecked you will get the separation needed to play split tracks. Looks like I answered my own question. Hahaha.
Thanks everyone that looked into this,
Greg

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