Even if you've lost your hearing in one ear you can still use the Paraliminal with great success. Both voices are in both ears just one dominates each channel. And for the heck of it you can swap them. It can create a different perspective.
With hearing loss that is dominant in one ear you would lose the ability to locate the direction of the sound with ease. You need to hear the sound a few times while turning in the spot and triangulate the direction. With a working ear on each side of the head the triangulation happens naturally.
This is a similar problem with being blind in one eye. You need 2 eyes to see in 3D. We see 3D because each eye sees the object from a slightly different angle.. Of course the brain is amazing, if you lose sight in one eye after experiencing 3D the brain knows and recognises what would be in 3D even though it's no longer seen that way.
[This message has been edited by Alex K. Viefhaus (edited February 24, 2005).]