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.

Long the bane of finicky audiophiles, <I>Consumer Reports</I> magazine has been measuring just about anything sold in a store since 1936 in an effort to "test products, inform the public, and protect consumers." But when they get around to testing audio gear, the magazine's "lab" has become the target of many audio enthusiasts who don't share <I>CR</I>'s views on how to tell good sound from bad. In fact, part of the problem is that <I>CR</I> often reports that sound quality is not always the final factor in rating a product, with concerns about reliablity, ease of use, and fit and finish often skewing results.

One might think that the publisher of "The Largest Marketplace in the World for Audiophile Equipment" would have a vested interest in encouraging trading activity among his readers. One would think that such a publisher might take a neutral stance regarding fluctuations in the world market for used equipment. One would think that he would credit his readers with sufficient intelligence to decide for themselves whether any specific purchase, sale, or trade was a good deal.

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 <A HREF="http://www.ssi.sony.com/">Sony Signatures</A>, his merchandising company. A portion of the gross from the "Billy Joel Memorabilia Auction" will be donated to <A HREF="http://www.vh1.com/">VH1</A>'s Save the Music Foundation, according to Dan Cooper, Senior Vice President of Sony Signatures' music division.

<I>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 outr&#233; (for these pages) outlook of a certified Audio Ignoramus, have finally borne astringent fruit in this diversion of an article.</I>

<I>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 outr&#233; (for these pages) outlook of a certified Audio Ignoramus, have finally borne astringent fruit in this diversion of an article.</I>

MP3-formatted audio files are considered to be the most popular streaming technology on the Internet, but the major record labels have so far shunned the format, which doesn't offer as much security and pay-per-download options as they'd like. Several announcements last week coincided with the <A HREF="http://www.webnoize.com">WebNoize</A&gt; conference in Los Angeles and revealed what a few of the labels are thinking.

The <A HREF="http://www.webnoize.com">WebNoize</A&gt; three-day conference took place last week in Los Angeles, mixing record-company executives with Internet geeks, all trying to find profitable ways to distribute music online. Tom Roli, publisher of the Webnoize website, set the tone for the event, stating that "the industry is facing great change and uncertainty due to emerging technologies, shifting global markets, and media revolutions."

In the age before recordings, music was a service business. Composers wrote for their patrons, and musicians performed for money. In the days since Edison's inventions, music has become a commodity business in which record companies stockpile large inventories and attempt to move them into the market of music lovers through a dense network of distributors and retailers. For established artists, the service aspect of music---playing for pay---now exists primarily to support the commodity business. For developing artists, public performance is a form of self-promotion to aid the search for a recording contract.