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Back in the summer of 2009, USB-connected D/A processors that could operate at sample rates greater than 48kHz were rare. Ayre Acoustics had just released its groundbreaking QB-9, one of the first DACs to use Gordon Rankin's Streamlength code for Texas Instruments' TAS1020 USB 1.1 receiver chip. Streamlength allowed the chip to operate in the sonically beneficial asynchronous mode, where the PC sourcing the audio data is slaved to the DAC. But high-performance, USB-connected DACs like the Ayre were also relatively expensive back then, so in the January 2010 issue of Stereophile I reviewed a pair of soundcards from major computer manufacturer ASUS , the Xonar Essence ST and STX, which, at $200, offered a much more cost-effective means of playing hi-rez files on a PC.

As songwriters go, Guy Clark has been touched by the muse more than most. Unfortunately, in recent years he's also been visited by illness and heartache. In June 2012, his wife of 40 years, Susanna Clark, who was both a songwriter ("Easy from Now On") and an artist (the cover of Willie Nelson's Stardust), died in Nashville. In the past several years Clark, 72, has battled lymphoma, had his knees replaced, and undergone an arterial replacement in one leg. He was being treated for skin cancer when I visited his home, south of Nashville, in October 2013.

I know someone who bought, for his own kitchen, a stove intended for the restaurant trade, simply because it enhances his enjoyment of cooking. Another friend, a motoring enthusiast, has equipped his garage with a brace of tools, including a hydraulic lift, that would be the envy of some humbler repair shops. Yet another friend indulges her enthusiasm for ceramics with a potter's wheel and kiln that one might find in a well-endowed art school. Among the most serious consumers, it seems, the watchword is professional; odd, then, that professional-quality monitors don't account for an even bigger chunk of the domestic loudspeaker market.