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Nelson Pass:  a portrait. Sea Ranch, CA, 2018. (Photograph and image processing by David W. Robinson) This piece was originally presented at the 2019 Burning Amp Festival but was hampered by problems with the projection system. It has been rewritten for Positive Feedback.... Introduction I don't need to tell you that audiophiles tend to be... Read More »

In spite of the improvements in efficient Class D switchers, watt-sucking Class A power amplifiers continue to attract high-end audiophiles. The breed remains as popular as ever—and why not? Any product of our school system knows that A is better than B, or C or D... I get quite a bit of email, and it... Read More »

Nelson Pass:  a portrait. Sea Ranch, CA, 2018. Photograph and image processing by David W. Robinson. Introduction – Why do we care about 2nd harmonic? Historically, audio amplification has been about the elimination of all forms of distortion. Early on, the premise has been that low distortion is one of the keys to audio quality... Read More »