The gullibility of hi-fi obsessives constantly amazes me

Today I saw a loudspeaker demagnetizing CD.

Yup, the idea is that you play it, and it sends special digital signals through your loudspeakers, removing residual magnetism and hence improving sound quality. A bargain at £11.99

I swear you can sell hi-fi nuts anything if you can come up with a Star Trek explanation of how it might work.