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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.

In the world of computer operating systems, you've got commercial products from Microsoft, Apple, Be, Sun, and others in one corner, and open-source products like Linux in the other. The commercial products are released to the public as finished products (at least until the next "bug fix" is ready), usually for a fee, and their core software code is protected much like the recipe for Coca-Cola. If you don't work for the company producing the official version, then it's hands off.

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>

The technology exists to create high-end audio programming that could finally solve the problem audiophiles have had with FM radio for years. But would you be interested enough to buy the equipment and/or pay for the service?

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.

Internet audio continues to expand. Last week, at the first WebNoize conference, held in Los Angeles, <A HREF="http://www.jamtv.com/">JamTV/Rolling Stone Network</A> and <A HREF="http://www.real.com/">RealNetworks, Inc.</A> announced the debut of <A HREF="http://www.rsradio.com/">Rolling Stone Radio</A>, a new Internet audio service offering music in several genres. Rock star David Bowie announced that he would serve as a disc jockey for the new venture. <A HREF="http://www.amazon.com">Amazon.com</A&gt; has also signed on to participate as a music retailer.