No one knows. I've heard various theories. Some say demagnetizing helps b/c the ink used on CD label can retain charge, which can "confuse" the digital reading by laser. I've heard several other equally weird theories.
What I do know is these devices do change the sound a little bit. I have both Bedini Ultra Clarifier and Furutech RD-2 device, and they do change the sound a little, and each make different changes from each other. Sometimes, a certain CD can sound worse after "treatment."
These da ...
Aluminium is thought of as a metal with least magnetic properties which is in common use and is not too expensive. That's why high end people make their cases of aluminium, to reduce eddy currents.
Now, throwing that material, albeit covered with some plasticky goo on both sides, into a strong concentrated magnetic field is not supposed to have much effect by default?
And if that plasticky goo has picked up some static, a simple rinse with tap water will get rid of it. Wipe dry with some soft cotton cloth.
Nope, sorry, I stilll don't see it. I think I'll stick with classic white magic spells and debauchery.
Ciao,
DVV