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In the classic textbook example, the Doppler effect is demonstrated by an increase in both pitch and volume (or amplitude) of a train's whistle as it approaches a station, followed by a decrease in pitch and volume as it moves away. This effect---the shift of a frequency emitted by a moving object---leads to a fundamental flaw in audio technology. A midrange driver behaves like the approaching-and-departing train when it attempts to reproduce varying frequencies. When the driver is fed simultaneous 400Hz and 2kHz tones, the forward movement of the cone at the lower rate modulates the 2kHz tone upward in pitch and amplitude; when it moves backward it modulates the higher tone downward. (The human eardrum also behaves this way, but the brain's audio-analysis circuitry knows how to deal with it.)

A study released earlier this month by <A HREF="http://www.arbitron.com">The Arbitron Company</A> and <A HREF="http://www.edisonresearch.com">Edison Media Research</A> shows that Internet radio broadcasting continues to be a fast-growing medium. The survey of Arbitron diarykeepers also brings to light both the challenges and opportunities that the Internet presents to radio broadcasters, particularly in the much-talked-about arena of e-commerce.

Audio wisdom holds that musicians tend to neglect their stereo systems. But we're wondering how many of <I>Stereophile</I>'s readers play music themselves, both for fun and professionally.

Last week we posted reviews of the <A HREF="http://www.stereophile.com//digitalsourcereviews/86/">Linn Sondek CD12 CD player</A> and the <A HREF="http://www.stereophile.com//loudspeakerreviews/85/">Linn AV 51 system</A>. This week we add a review of the <A HREF="http://www.stereophile.com//analogsourcereviews/88/">Linn Linto phono preamplifier</A>, as well as John Atkinson's report on the <A HREF="http://www.stereophile.com//loudspeakerreviews/89/">Revel Ultima Gem loudspeaker & Ultima Sub-15 subwoofer</A>, and Tom Norton's review of the complete <A HREF="http://www.stereophile.com//loudspeakerreviews/90/">Revel Home Theater</A> speaker system.

After dozens of thorny issues slowed its progress (see <A HREF="http://www.stereophile.com/news/10281/">previous report</A>), last week the <A HREF="http://www.dvdforum.com/">DVD Forum</A> announced that its Steering Committee has approved Version 1.0 of the DVD-Audio Disc specifications, making it the fifth of the DVD format family after DVD-Video, DVD-ROM, DVD-RAM, and DVD-R. According to a statement, the DVD Forum says it will soon publish the DVD-Audio Format Book, which contains the detailed specification of the format, and make it available to authorized companies by "early spring of this year."

When it comes to delivering audio/video programming to the home, there's no substitute for bandwidth. Typically measured in megahertz (MHz) for analog signals or megabits per second (Mbps) for digital datastreams, the amount of bandwidth your system can access determines how much programming you can receive and at what level of quality.

It was the weirdest orchestral balance I'd ever heard. The gentle woodwind chords that begin Mendelssohn's incidental music to <I>A Midsummer Night's Dream</I> were as loud as the climactic "Wedding March" that ends the piece. The radio broadcast was obviously being compressed to hell. Yet, sitting at the wheel of the rented Vauxhall Vectra I was driving down to Cornwall for an old friend's surprise 50th birthday party, I was actually glad for the compression. Had Classic FM broadcast the Mendelssohn with its true dynamic range intact, the quiet passages would have been irretrievably buried in the road noise and the loud passages would have had me lunging for the volume control, to the possible danger of those sharing England's congested A303 trunk road with me.