Sorry to bother. I think I just answered my own question. I sent an email to The Monroe Institute, and if you are interested, I am pasting the quote below:
"John,
Your e-mail was forwarded to me by the Institute for answering. You can listen with any headphones you have, as long as you are getting the frequencies through both ears you are good. Also, you will get the same benefits listening with a download as you do the CD. Compare it to digital pictures and pictures on film, there is a slight difference, but it does not effect the overall outcome."
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Thanks everyone,
John
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