LATEST ADDITIONS

The hoary question of tubes vs transistors, once certain and clear, is made ambiguous by recent products from a few solid-state specialists, not the least being Ayre Acoustics—the company that endures in the wake of the passing of its founder, the widely admired Charley Hansen. In their solid-state preamplifiers and amplifiers of the past decade in particular, Ayre has enshrined a number of technologies that are more than just variations on the audio-engineering status quo, and that appear to pay real sonic dividends.

I got an e-mail last summer from my colleague Tyll Hertsens, editor of our InnerFidelity website. "Recently reviewed and really liked the new MrSpeakers Æon," he wrote. "They're a little rough-sounding as sealed headphones tend to be, but the tonal balance is superb. I got three in for review to make sure they're consistent. After measurements I asked [MrSpeakers'] Dan Clark if I could forward them to you because I like them so much and thought you should hear them. . . . I really think you may enjoy them."

During the hour preceding my removal of the KEF LS50 loudspeakers from their spiked, rough-iron stands, I was lost in the recurring still moments, reverberating tones, and contemplative spirit of Sir John Tavener's Eis Thanaton and Theophany, in the recording by soprano Patricia Rozario, bass Stephen Richardson, and Richard Hickox conducting the City of London Sinfonia (CD, Chandos CHAN 9440).

The Nonesuch Records CD Steve Reich: Pulse / Quartet arrived with its sonic bonus unheralded. With no MQA designation on the album cover or disc, few would have known of its MQA provenance had not posts appeared on Facebook that, when inserted in a player capable of decoding MQA, it can deliver high-resolution MQA.

Audiophiles are oblivious to the low-end music-reproduction medium that's currently staging a comeback: the cassette tape (footnote 1). I've adopted the cassette craze in my own small way. I glory in the trusted mixtape, which I play in the stereo cassette deck of my 1990s Toyota. An automobile is a dearly cherished possession in New York City; when I cruise the outer boroughs on Sunday, I want tunes galore. So I retrieved my 1996 Aiwa cassette deck, and, attic-bound as it had been for 20 years, it was in need of repair. Via Yelp, I came across Hi-Tech Electronics, a small repair-everything-electronic shop at the east end of Canal Street, in New York's Chinatown, and a mother lode of classic audio gear and audiophile nostalgia.

There's good news for owners of Thiel loudspeakers manufactured between 1977 and 2012. Coherent Source Service of Lexington, Kentucky, will provide Thiel warranty and non-warranty service for customers worldwide. The company has been founded by Rob Gillum, who worked with Thiel for over 30 years and eventually became Director of Manufacturing.

When you come to a fork in the road, take it.—Yogi Berra

Over one busy week in 1986, Karlheinz Brandenburg laid the foundation of a technology that a few years later would upend the record business. Brandenburg, a PhD student in electrical engineering at the Friedrich-Alexander University Erlangen-Nuremberg, was figuring out how to code digital music efficiently enough that it could be delivered over digital telephone lines. A patent examiner had concluded that what the application proposed was impossible, so over a week of late nights, Brandenburg produced the proof of concept and more. It was another decade before the technology—MPEG-2 level III, more commonly known as MP3—would find its true home, the Internet.