Stereophile and Music Hall Audio share a long mutual history. Like most relationships, it's had its ups and downs; unlike most relationships, this one is well documented—in retired writer Sam Tellig's much-loved "Audio Cheapskate" and "Sam's Space" columns, and Music Hall Audio proprietor Roy Hall's responses in "Manufacturers' Comments." I always found Sam and Roy's gentlemanly brawling to be good, clean, if occasionally uncomfortable fun—like the touchy rapport between a gregarious dog and a rascally cat forced to live under the same roof: A truce may have been called, but don't expect them to make nice.

Approximately 33¹/₃ years after AudioQuest's first phono cartridge, the company announced two new USB D/A headphone amplifiers: the DragonFly Black ($99) and the DragonFly Red ($199). Both have circuits designed by the engineer responsible for the original DragonFly—Gordon Rankin, of Wavelength Audio—and both have the novel distinction of requiring considerably less operating power than their predecessors, so much less that the new DragonFlys can be used with iPhones, iPads, and various other mobile devices.

Fifteen years ago, when I was the Editor of Listener, I wrote a response to a reader's letter in which I repaid unpleasantness with unpleasantness: something I justified by flattering myself that my brand of unpleasantness had the advantage of being clever. Not satisfied with making his point sound foolish, I made certain that the writer of that letter would himself be made to look ridiculous. I made fun of his name, too.

Prior to publication, I showed my handiwork to my wife, Janet, as per my usual practice. I expected her to laugh at the funny bits and praise my superior logic, also as per usual.