Components listed here have been formally reviewed in Stereophile and have been found to be among the best available in each of four or five quality classes. Whether a component is listed in Class A or Class E, we highly recommend its purchase.

Each listing-in alphabetical order within classes-is followed by a brief description of the product's sonic characteristics and a code indicating the Stereophile Volume and Issue in which that product's report appeared. Thus the May 2017 issue is indicated as "Vol.40 No.5."

We have received the sad news that loudspeaker maven Siegfried Linkwitz, co-inventor of the innovative Linkwitz-Riley crossover network, has died. He had been suffering from prostate cancer for some years and had been receiving hospice care at his home.

One of the most important international competitions for young (ages 16–29) violinists takes place in the United States every four years. (The other top-tier classical-music competitions that include violinists, Moscow's International Tchaikovsky and Belgium's Queen Elizabeth, also run on four-year cycles.) While one might expect the US entry on that list to be hosted in California or New York, the venue is: Indianapolis, of 500-mile auto-race fame&#151land for excellent reasons.

"No one's buying music anymore: They're renting it."—John Atkinson, keynote speech, AXPONA 2018

Streaming music isn't new. US companies have been doing it since the 1920s, when it was discovered that multiplexing—the then-new practice of combining multiple signals over a single conductor—could be used to send live or recorded music over public power lines. The first of those companies was Muzak LLC.

File that away.