Features

If you missed Part">http://www.stereophile.com/features/105kh">Part 1 of this article (Stereophile, January 2005), or it has faded in your memory, here's a résumé. (Readers who recall Part 1 with crystalline clarity, please skip to paragraph four.) The accurate measuring of loudspeakers requires that the measurements be taken in a reflection-free environment. Traditionally, this has meant that the speaker be placed atop a tall pole outdoors or in an anechoic chamber. Both of these options are hedged around with unwelcome implications of cost and practicality. To overcome these and allow quasi-anechoic measurements to be performed in normal, reverberant rooms, time-windowed measurement methods were developed that allow the user to analyze only that portion of the speaker's impulse response that arrives at the microphone ahead of the first room reflection. MLSSA from DRA">http://www.mlssa.com">DRA Labs is the best-known measurement system to work on this principle, and both John Atkinson and I use it in the course of preparing our loudspeaker reviews.

Looked at from one viewpoint, DVD-Audio and SACD appear to be exercises in sheer profligacy. In the case of DVD-A, why provide a maximum">http://www.stereophile.com/features/282">maximum bandwidth almost five times what is conventionally taken to be the audible frequency range, and couple it to a dynamic-range capability far in excess of that achievable by the microphones used to record the sound? In the case of SACD, why provide a potential bandwidth in excess of 1.4MHz, only to fill more than 95% of it with quantization">http://www.stereophile.com/features/374">quantization noise?

The science of recording music is, to apply a metaphor from a very different context, akin to "breaking a butterfly on a wheel" (footnote 1). The art of recording is to make it appear as though that pinned insect could still take wing. I have been devoted to both the science and the art of recording music since 1965, when I was given a Grundig ¼" open-reel tape recorder as a birthday present. You could even say that my evolving interest in audio and my current position at the helm of Stereophile date back to my finding out how different a Shure SM57 dynamic cardioid microphone sounded from a Reslo Ribbon, even in mono, even at 3¾ips, when captured on that Grundig.