I thought I knew what a preamp could do. But when the Dan D'Agostino Master Audio Systems Momentum HD preamplifier ($40,000) arrived for review, all my expectations flew out the window.

Only recently did I learn that successive generations of the Chevrolet Corvette are referred to by the cognoscenti with two-character alpha-numeric identifiers: C1, C2, C3, and so on. I learned this while reading about the most recent version—C8, known to non-cognoscenti as the 2020 Corvette—which happens to be the first version since C2 that impresses me. (I say that as one who used to work for the owner of a C3, a then-middle-aged male who actually boasted, while under the influence, that he and two of his C3-owning friends drove them solely because their juvenile styling attracted juveniles. Rest assured I left his employ within days of that revelation.)

Occasional Stereophile contributor Steve Guttenberg publishes a YouTube channel about audio that has achieved an impressive reach. As Steve told me in a conversation I had with him last December, 22% of his 98,000 subscribers (at the time we talked) are under 34 years old, and, to judge from the comments, most of them don't read Stereophile!!!! "It would nice to introduce you to them!" said Steve, and proposed he interview me and post the video to his channel when it hit the magic 100k number, which it did on January 9.

Steve visited my place in Brooklyn just before the New Year, and we spent an afternoon talking about audio, magazines, measurements, and music.