This, our February issue, is the first Stereophile issue to arrive during the year 2020, which marks the 50th anniversary of the founding of Audio Research—in my view one of the key events in the history of high-end audio. So it makes sense for this issue to include an Audio Research review—in this case, of the $20,000 Reference 160 S stereo amplifier.

Even as digital/analog processors were becoming a hot product category in the early 1990s, audiophiles were also learning that timing uncertainties in the AES/EBU and S/PDIF serial datastreams—jitter—would compromise any improvement in sound quality offered by these DACs. Some companies therefore introduced products to reduce or eliminate jitter—in the November 1994 issue of Stereophile, Robert Harley reviewed three such products: the Audio Alchemy DTI Pro, the Digital Domain VSP, and the Sonic Frontiers UltrajitterBug. I still have Stereophile's review samples of the UltraJitterBug and VSP, along with two contemporary DACs: a PS Audio UltraLink and a Parts Connection Assemblage DAC-1.

As our reviews of these products were published before Paul Miller's and the late Julian Dunn's development of the "J-Test" diagnostic signal, I performed J-Test jitter measurements to bring that 1994 review into the 21st Century. You can see what I found here.

B>Cecilia Bartoli: Farinelli
Cecilia Bartoli, mezzo-soprano; Il Giardino Armonico, Giovanni Antonini, cond.
Decca 4850214 (24/96 download). 2019. Arend Prohmann, prod. and editor; Philip Siney, eng.
Performance: *****
Sonics: ****

When I first heard mezzo-soprano Cecilia Bartoli in person some 29 years ago, at her West Coast debut in the "Cal Performances" series at Berkeley's Hertz Hall, she was just 24 years old. Along with the rest of the audience, I was astonished at her ability to ally phenomenal coloratura technique with an out-of-the-box range of expression—unheard since the prime of Maria Callas. It was clear why Decca had already signed her and released her first recording the year before, when she was just 23.