The disc uses a series of complex signals—specifically narrow-band random noise and out-of-phase frequencies—to exercise the mechanical parts of a loudspeaker. The 2021 FLAC Reissue: Why Digital Matters
For the best "cleaning" effect, JMR originally recommended placing speakers face-to-face (nearly touching) and wiring one out of phase. This cancels out much of the noise so you don't have to listen to the static while it works. Jean-marie Reynaud Magic Cd Flac 2021
The specific tracks on the 2021 version are excellent for identifying "rattles" in your listening room. Because the signals are consistent and sustained, you can easily walk around the room to find vibrating shelves or loose window panes that color your sound. How to Use the 2021 FLAC Version Safely The disc uses a series of complex signals—specifically
Never start the track at high volume. Set it to a "moderate" level where you can still hold a conversation. The specific tracks on the 2021 version are
New speakers often sound "stiff" because the spiders and surrounds of the drivers need to loosen up. The Magic CD uses specific frequencies to work these mechanical parts more efficiently than standard music, reducing the break-in time from hundreds of hours to just a few dozen. 2. System "De-Gaussing" and Cleaning