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It's well known among designers of power amplifiers that the class-A and -A/B amplifiers (referred to as linear amplifiers) used in the majority of car, home, PC, and pro audio systems are notoriously inefficient. They can consume vast amounts of power and yet waste most of it---as much as 80% or more---as heat. They require large power supplies and massive heatsinks, which drive up system weight, size, and cost. On the other hand, class-D amplifiers, using Pulse Width Modulation switching technologies, have good power efficiency but sometimes questionable audio fidelity. (The Spectron designs are possibly the exceptions here.) Class-D amps are used mostly in battery-powered applications in which sound quality might be considered secondary to battery life.

Billy Joel has decided to clean out his warehouse. Next month, the veteran rocker's almost-30-year-old collection of musical instruments, recording equipment, and stage gear will be put up for public auction by Sony Signatures, his merchandising company. A portion of the gross from the "Billy Joel Memorabilia Auction" will be donated to VH1's Save the Music Foundation, according to Dan Cooper, Senior Vice President of Sony Signatures' music division.

Caveat: This article is written by a non-audiophile. I own and listen to several thousand recordings through about $2500 worth of a rather motley assortment of audio components. Though very well informed musically, and a disciplined listener, Audiophilia remains for me a storied land. Various desultory discussions with Larry Archibald and John Atkinson, some going back almost two years, about the possibly refreshing, certainly outré (for these pages) outlook of a certified Audio Ignoramus, have finally borne astringent fruit in this diversion of an article.