Miscellaneous

I've been enthusiastically tracking the development of Bel Canto's class-D amplifiers, from their original TriPath-based">http://www.stereophile.com/amplificationreviews/442">TriPath-based models to their more">http://www.stereophile.com/musicintheround/1106mitr">more recent designs based on Bang & Olufsen's ICEpower modules. With each step, Bel Canto has improved their amps' sound quality and reliability.

"A switch? Why do I need a switch?" That was my response to Meredith Gabor, head of marketing and PR for cable and accessories manufacturer Nordost, after she dropped the news. She had just arranged with Jim Austin for me to write a shorter, "ancillary" review of the new Nordost QNet Network Switch ($3199.99) with its optional QSource linear power supply ($2749.99) and premium QSource DC umbilical interface cables ($339.99 for 1m). Why did I need an expensive QNet switch when my router was functioning reliably? Good question.

In the opinion of this hi-fi reviewer, the debate over the efficacy of audio-quality network switches should be over. As logic would dictate, when connections are made via a network switch, the quality of its inputs, outputs, oscillators (clocks), power supplies, and pathways affects the sound of everything downstream. It's clearly audible. Everything matters.

The Swiss-made G-36 recorder had earned an enviable reputation among perfectionists during the few years that it has been available in the US, and our inability to test one (because of a backlog of other components for testing) became increasingly frustrating to us with each glowing report we heard from subscribers who owned them. Now that we have finally obtained one through the courtesy of ELPA (footnote 1), we can see what all the shouting was about, but we also have some reservations about it.

Last January, the Stereophile website conducted a pollhttp://www.stereophile.com/showvote.cgi?236">poll; asking readers what they thought was their audio system's weakest link . The results indicated that 24% thought that their room was the most problematic component. What this says is that, though often accused of being obsessed with hardware, we audiophiles are aware of what a potent effect the speaker-room setup has.

With every passing season, a new audiophile-grade network switch hits the market. These products, which can cost hundreds or thousands of dollars, do the same basic thing as network switches bought at Best Buy for $30 or so (except, in some cases, slower), but their manufacturers claim they are built to a higher standard to achieve better sound.

As with all signal-conditioning devices that operate completely in the digital realm—especially those that work at packet level (more correctly referred to as "frame-level" on the local side of the router, but that's a distinction that even few experts make)—the sonic efficacy of audiophile network switches is debated, the debate being, as usual, mainly between those who insist they hear a difference and those who insist, on theoretical grounds, that no difference is possible.

Can a power-supply upgrade produce audible sonic benefits? If you've upgraded the power supply of a phono preamplifier, you probably don't need to be convinced that it does, and those usually cost only a small percentage of the price of the model they power. But to add Simaudio's Moon Evolution 820S power supply ($8000) to the Moon Evolution 650D DAC–CD transport ($9000), which I reviewed in the November 2011 issue, almost doubles the latter's cost—though the 820S can be used to simultaneously power two Moon Evolution components, like the 750D DAC ($14,000), 740P preamplifier ($9500), and 610LP ($7500) and 810LP phono preamplifier ($13,000).