Things to check (pretty much in this order):
Have you tried to play it on a different unit to see if it's the CD? While the technology to produce CD's is fairly good, occasionally things can go wrong in creating them.
Can you hear the "left" track on other similar CD's - or even on music CD's, with the equipment you are using?
Is the unit you're using "stereo" - or mono? Or does it have a switch that might have been moved to mono?
Has the balance on your stereo unit been moved over to the "right" channel completely? It should be centered.
Have you tried another set of ear-phones? Perhaps one of the wires is crimped on the ones you're using - that can affect the output.
I hesitate to mention anything about your own hearing, but if this is a problem with more than one of the paraliminals, and everything else above checks out, then I'd suggest you investigate hearing loss.
Hope this helps.
Cheers!
Unis
