The Gryphon Exorcist is a system demagnetizer that addresses the deleterious effect of magnetization on the audio signal. Gryphon argues that many of the conductive parts in the audio chain, both electronics and cables, become magnetized over time through DC leakage, and when this happens the music suffers. The Exorcist addresses this by producing a tone that reverses the effect, but unlike the various CDs that also claim to perform this same function, the Exorcist is an active device. Price: 125 euro.