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Hi-fi buffs often claim to improve sound quality with bizarre electronic
鈥渢weaks鈥濃�攂ut the results are often highly subjective and hard to prove.
Jean-Claude Froidevaux is filing patents around Europe (EP 859 483) on a device
which he claims improves fidelity by applying a signal to the mains supply
powering the hi-fi. Half the mains feeds the hi-fi, and the rest is used to
generate a frequency twice that of the mains. This signal is used to induce a
matching frequency in the supply. This, claims the inventor, makes the mains
supply 鈥渃leaner鈥� and gives 鈥渋mproved quality鈥� sound.