LATEST ADDITIONS

During a recent visit to Canada's National Research Council, I noticed stuck to the wall of the prototype IEC listening room a page of results from one of Floyd Toole's seminal papers on the blind testing of loudspeakers. The scoring system was the one that Floyd developed, and that we adopted for Stereophile's continuing series of blind tests. "0" represents the worst sound that could possibly exist, "10" the perfection of live sound—a telephone, for example, rates a "2." The speakers in Floyd's test pretty much covered the range of possible performance, yet their normalized scoring spread, from the worst to the best, was just 1.9 points.

TERRY EVANS: Blues for Thought
PointBlank/Charisma/Virgin 39064 2 (CD only). Ry Cooder, prod.; Mark Ettel, eng. AAD? TT: 49:18

In this space last January, I enthused about the sound of linear 20-bit digital recordings which, I felt, preserve the quality of a live microphone feed. "I have heard the future of audio—and it's digital!" I proclaimed, which led at least a couple of readers to assume I had gone deaf. Putting to one side the question of my hearing acuity, 20-bit technology has been rapidly adopted in the professional world as the standard for mastering. The remaining debate concerns how to best preserve what those 20 bits offer once they've been squeezed down to the 16 that CD can store. Sony's Super Bit Mapping algorithm and Harmonia Mundi Acustica's redithering device have been joined by new black boxes from Apogee Electronics, Lexicon, and Meridian; it appears likely that, in next to no time at all, all CD releases will be offering close to 20-bit resolution—at least in the upper midrange, where the ear is most sensitive.

RICHARD THOMPSON: Mirror Blue
Capitol CDP 7 81492 2 (CD). Tchad Blake, eng.; Mitchell Froom, prod. AAD. TT: 55:13