I'm a sucker for materials, whether it's finishes for loudspeakers and other audio equipment, a shoe's fine, supple leather, a crisp cotton shirt, or a cozy cashmere scarf.

Apart from their inherent sensuousness, materials can make a difference in the sonics of audio components, especially loudspeakers.

Cavitation revolutionized record cleaning more than a decade ago, when Reiner Gläss's Audiodesksysteme introduced its original fully automatic machine. Mr. Gläss's innovative machine, which automatically spun the record in ultrasonically cavitated water, then dried it with fans, at first was plagued with reliability issues, and because it is sealed, it was not easy to repair.