Densen De Magic.

I bought this CD with some considerable scepticism - how can three minutes of horrible noises across the entire audio bandwidth make your system sound better? I thought. Well, it was only a tenner, so I thought I'd give it a go. It actually works! I give this disc a spin every couple of weeks or so - not too often or I won't be able to appreciate its benefits so much. Mid and background info becomes so much clearer with backing vocals and counter-melodies becoming much easier to follow and separate from the rest of the mix. Dynamics regain that room-filling aspect that makes your head shake from side to side, or the goose pimples go up more.
Has anyone else tried this disc, which is supposed to demagnetise your system?