To audio designers in Japan and elsewhere, the single-ended, 300B-tubed amplifier is like a haiku: an art form defined by both its prescribed limitations and the potential such restraint offers for artistic expression. Here, the only hard-and-fast rule is a simple one: output devices are limited to one 300B directly heated triode tube per channel. From there, it's a blank slate: Do you want AC or DC on the output-tube heaters? Tube or solid-state rectification? Low or high gain? Fixed or cathode bias? New parts, vintage parts, or a mix of both? Triode or pentode tubes as drivers? Capacitors or transformers—or nothing at all—between the plates of the driver tubes and the grids of the output tubes?

Roon, one of the major brands of audiophile-quality high-resolution music playback software, has just released its v.1.6 upgrade. Roon 1.6 finally includes a portal for hi-rez streaming Qobuz, whose US launch is rumored for sometime next month. In addition to pairing Roon's rich metadata with the entire Qobuz and Tidal catalogs, the upgrade also offers major new features.

I had a moment of revelation in 2000, when I first set up a pair of Revel's original Ultima Studio loudspeakers in my living room. It wasn't just my awareness that Revel's next-to-top-of-the-line loudspeaker was outstandingly good—it seemed to perfectly match my space and my ears. From the first day, I knew these would be keepers and I purchased the review samples.

Revel's Ultima Studio2 arrived in 2008, and though it performed even better than the original, the impression it made on me wasn't quite revelatory, and my praise was somewhat restrained—something for which Fred Kaplan justly chided me in his enthusiastic Follow-Up review in December 2009. To this day, the Ultima Studio2 and Revel's top model, the Salon2, remain Revel's standard bearers. Meanwhile, I wonder when there will be a Studio3.

I am obliged to begin this review of First Watt's new stereo power amplifier, the SIT-3, with an explanation of how I believe a power amplifier should be reviewed. Why? Because the 18Wpc SIT-3 is a unique and historically important design that can't be wired up to just any loudspeaker and then critiqued on the basis of its bass power, treble brightness, or midrange acuity.