In Herb Reichert's review of the original Schiit Audio Ragnarok integrated amplifier, he wrote, "Schiit Audio's Ragnarok [is] the first amplifier of my experience that plays earth and sky, mind and body, brown eyes and blue, speakers and headphones, with equal narcotic intensity." Herb's colorful conclusions so persuaded me of the Ragnarok's worth that, when Schiit Audio's Jason Stoddard and Mike Moffatt announced the impending release of the Ragnarok 2, I pitched a Stereophile follow-up review.

Hi-Fi: The History of High-End Audio Design, by Gideon Schwartz, Phaidon Press, 2019. 272pp. $84.97, hard cover.

The ongoing evolution of hi-fi can be measured in any number of ways. Most obviously, we see that evolution in the technologies associated with our industry: in big breakthroughs—mono to stereo, tubes to transistors, analog to digital—as well as incremental improvements in materials and manufacturing techniques.