Integrated Amp Reviews

A decade ago, many predicted that amplifiers with switching or class-D output stages would come to dominate high-end audio. In a post–Peak Oil world in which the price of energy would always continue to rise, a class-D amplifier's very high efficiency in converting AC from the wall outlet into speaker-driving power would be a killer benefit. Although a conventional push-pull class-B amplifier has a theoretical efficiency of 78.5%, which would seem usefully high, this efficiency is obtained only at the onset of clipping; the need for the output devices to carry a standing bias current reduces that efficiency considerably, typically to around 50%. Class-A amplifiers are even less efficient, with a maximum of 25%; ie, three times as much power is dissipated by the amplifier as waste heat as is used to drive the loudspeaker (see "Sam's Space" in this issue).

There have been lots of great, and even some fabulous books of music criticism or reportage, and I've recommended several in these pages. So far, however, only one has made me chuckle, chortle, or laugh out loud, time and time again.

As the 2009 Consumer Electronics Show neared its end, I wandered into Blue Light Audio's room, which was dominated by the innards of darTZeel's new NHB-458 monoblocks—think of a 3D "exploded" diagram and you'll be on target. So impressive was that display of brute engineering that I almost didn't notice the amplifier that was actually making the music: the CTH-8550 integrated ($20,300).

A new integrated amplifier called the Lars Type 1, which made its debut at the 2009 Consumer Electronics Show, has given my notion of a dichotomy between mainstream audio and alternative audio a severe beating. In that sense, the Lars Type 1 has been a life-changing product, although the change took longer than expected for me to digest.

After Fred Kaplan reviewed Boulder Amplifiers' 810 line preamplifier and 860 power amplifier for the December 2007 Stereophile, John Atkinson requested that I listen to the 860 in my own system for a while. Never having reviewed any Boulder kit, I was curious.

Winter has returned to Cherry Valley, New York, and I'm reminded of a bad habit that I used to conceal: On cold mornings I started my car well before driving off, then actually weighted down the accelerator pedal—with the heavy socket tray from my toolbox—in an effort to keep the idle high, and thus more quickly warm the windshield and the interior. Whether my lazy trick had the desired effect is a matter of some debate, but I wish now that I hadn't been so wasteful and so casually fouled the air.

Fearless leader called me and asked if I'd be interested in reviewing the Simaudio Moon i-1 ($1500), the entry-level integrated amplifier in Simaudio's Classic line. Hmmm. I'd been very impressed by all of the more expensive Simaudio products I'd heard at Stereophile's Home Entertainment shows over the years, and the 50Wpc Moon i-1 would be an interesting match for the affordable speakers I've had in-house lately. Send it on, JA!