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Hi-fi fans swear that voltage spikes and frequency variations in the mains
electricity supply ruin their listening. Now PS Audio of Avon, Colorado, has
come to the rescue. It has developed a $1000 device called Power Plant
that plugs into a mains socket and delivers a pure waveform. Power Plant takes
鈥渄irty鈥� mains electricity and converts it from AC to DC and back again, using a
digital signal processor to generate a pure sine wave of the precise mains
frequency. This is fed to a high-power amplifier which boosts the sine wave back
up to mains voltage.