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

The WebNoizehttp://www.webnoize.com">WebNoize; 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."

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 WebNoizehttp://www.webnoize.com">WebNoize; conference in Los Angeles and revealed what a few of the labels are thinking.

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.

I have been informed that there was a serious error at the shipping department. The September and October issues of Stereophile and Stereophile Guide to Home Theater have been sent via a very slow shipping method. This was due to a misunderstanding between the magazines' new printer and the new subscription mailing house.