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Such was the case with the Delaware Acoustics DELAC S10, which costs $629/pair. Only sold factory-direct, this would therefore have been low on Stereophile's priority list for review if it weren't for two things: first, the fact that the S10 was designed by one Ralph Gonzalez, a name that should be familiar to readers of Speaker Builder magazine for having written a very useful speaker design and analysis program; second, as implied in the first paragraph, the S10 is one of the weirdest speakers I have ever laid ears on.

So today we'll pick up on this principle and briefly compare the sound qualities of six very different headphone amplifiers, concentrating on their headroom, impact, perceived loudness, detail, and depth. Then, in the next episode, I'll try to make sense of the listening and see if there is any correlation between what we measure and what we hear. Don't expect a miracle—listening versus measurements is an ongoing debate, but in Episode 22 I promise to reveal some tantalizing clues!

Astounding performances! Every piece here was commissioned by the King's Singers, those six English gentlemen whose vocal artistry surely has never been surpassed. The works here are by Peter Dickinson, Malcolm Williamson (recently appointed by HRH Elizabeth II to the post of Master of the Queen's Musick, succeeding the late Sir Arthur Bliss), Richard Rodney Bennett, Krzystof Penderecki, and Paul Patterson.

And BOOM! Acoustic Research, a brand long recognised amongst audio enthusiasts, shows up with their new planar magnetic AR-H1 at CanJam at RMAF 2017. Color me surprised!