Almost a year ago, a headphone pal loaned me the Zach Mehrbach–designed ZMF Auteur LTD headphones. He said, "Herb, see if you like these." I took them home and right away thought, Wow, these headphones really disappear!

Nothing about their sound attracted my attention. The only thing I noticed, casually, was how relaxed and unbelievably transparent they were.

In my January 2020 Listening column, I wrote about a place where three things overlap: the joys (and benefits) of being a record collector, the natural tendency to grow and challenge ourselves as listeners, and the need to forgive ourselves for the shortcomings of our youth. The hook was the story of how I started out disliking the music of guitarist John Fahey (1939–2001) and ended up loving it. But it could just as easily have been about cooking or hiking or Jethro Tull or any of a number of other things.

Between the mid-1980s and late 2000s, Stereophile published 14 reviews of loudspeakers from England's ProAc Limited. First came Dick Olsher's review of the ProAc Tablette in 1984. The latest—until now—was in 2010, when John Marks wrote about the ProAc Response D Two.