Solid State Power Amp Reviews

Sort By: Post Date | Title | Publish Date
John Atkinson Posted: Dec 30, 2013 Published: Jan 01, 2014 13 comments
Whereas the Pass Labs preamplifiers are designed by Wayne Colburn, the power amplifiers are the work of company founder and high-end audio veteran Nelson Pass, who even lays out his own circuit boards. The X-model amplifiers, beginning with the X1000 in 1998, were the first implementation of Nelson Pass's patented Supersymmetry topology (see "Nelson Pass on the Patents of Pass"). The XA series, which debuted in 2002, combined Supersymmetry with the single-ended class-A operation of the Aleph series. The XA.5 models offer detail improvements over the XAs.
John Marks Posted: Dec 12, 2013 5 comments
Lindell Audio, a Swedish professional-audio company, was founded in 2010 by recording engineer Tobias Lindell, and claims to offer equipment "by engineers, for engineers." Tobias Lindell specifies the features and functions that he wants each product to incorporate; the actual circuit designs are by others. Although Lindell's corporate headquarters are in Sweden, the products are manufactured in China, and are competitively priced.
Michael Fremer Posted: Nov 07, 2013 4 comments
High-performance audio has always been and will probably remain a cottage industry perpetuated by talented and visionary individuals whose products reflect their singular visions and whose companies often bear their names, though of course there are notable exceptions. One of them is Constellation Audio. No single star dominates the appropriately named Constellation Audio, which arrived on the scene at the 2010 Consumer Electronics Show with a seemingly impossible debut roster of products: stereo and monoblock amplifiers, preamplifiers, digital file player/DACs, and phono preamplifiers, each category of component represented by members of two distinct lines: no compromise and some compromise.
Jonathan Scull Posted: Aug 16, 2013 Published: Nov 01, 1995 0 comments
Things didn't start off auspiciously. I'd been after Symphonic Line's Klaus Bunge for more than a year to send me the Kraft 400 Reference monoblocks. Finally he called. He said he was going to be in town for a few days, and he had with him a pair of what he described as his "traveling" Kraft 400s, which he proposed to leave with me.
Brian Damkroger Posted: Jun 14, 2013 17 comments
In the September 2005 issue (Vol.28 No.9), I reviewed Simaudio's first reference-quality power amplifier: the 1000W, 220-lb Moon Rock monoblock ($37,000/pair). At the time, the Rock was a dramatic departure for Simaudio, then primarily known as a maker of midpriced gear that was good for the money. I found a lot to like about the Rock, concluding that while it wasn't quite up to the standard of the best superamps of the time, it was very good—and, for Simaudio, an admirable first shot at the state of the art.
Michael Fremer Posted: Feb 04, 2013 24 comments
What better way to celebrate the expiration of a noncompetition clause than to debut a product that has no competition? That's what Dan D'Agostino appears to have done with his Momentum monoblock amplifier ($55,000/pair)—his first new product since leaving Krell, the company he cofounded more than 30 years ago.
Michael Fremer Posted: Dec 07, 2012 15 comments
Mark Levinson founded Mark Levinson Audio Systems in 1972, but sold it, and the right to market audio gear under his own name, to Madrigal Audio Laboratories, then owned by the late Sandy Berlin, in 1984. Harman International bought Madrigal in 1995. As well as Mark Levinson, Harman's Luxury Audio Group now also includes digital processing pioneer Lexicon, speaker manufacturer Revel, and JBL Synthesis. The Mark Levinson brand is now headquartered in Elkhart, Indiana, at the Crown Audio facility, another Harman-owned brand. The No.53 ($25,000 each; $50,000/pair) is Mark Levinson's first new Reference series monoblock since the No.33, way back in 1993, when Madrigal owned the company. Like other Mark Levinson products, it is manufactured at an independent facility in Massachusetts.
Kalman Rubinson Posted: Dec 07, 2012 15 comments
When I first saw Anthem Statement's M1 at the 2011 CEDIA Expo, it was a bolt from the blue. Happening on this flat, black slab of an amplifier lying on a display table or bolted to a wall, reminded me of the appearance of the iconic monolith in Stanley Kubrick and Arthur C. Clarke's 2001: A Space Odyssey. The M1's dimensional ratios are not 12:22:32, and there are many other one-rack-unit amps—yet, like the monolith on the moon, the M1 was in such striking contrast to everything else in its environment that it demanded attention and reflection.
J. Gordon Holt Posted: Aug 17, 2012 Published: Jun 01, 1987 1 comments
"Grand Integra" is the name Onkyo has given to its line of perfectionist-oriented audio products, and the M-508 is the cheaper of Onkyo's two Grand Integra power amplifiers. (The flagship model is the $4200 M-510, reviewed by Larry Greenhill in Vol.8 No.8, featuring "high current capability," and rated at 300W continuous per channel.)
Michael Fremer Posted: Aug 03, 2012 2 comments
A recent (unpublished) letter to the editor argued that the reference for audio perfection is the sound of real instruments in a real space. The writer claimed that, since the art and/or science of audio is advancing, and because it is a "scientific truth" that the closer you get to perfection, the less divergence there is components, that therefore there should be less difference in sound among the components listed in Class A of Stereophile's "Recommended Components" than among those in Class B, much less Class C. This should be true of loudspeakers, he said, but even more true of top-rated amplifiers, since "they inherently have less divergence."
John Atkinson Posted: Apr 06, 2012 0 comments
There is always a conflict between the needs of reviewers and the realities of the marketplace. Once a reviewer has invested his time and energy in a review, he would like that product to remain in production for all time, which would allow it to be used as a reliable recommendation forever. But whatever the product and whatever the category, sales of a product almost always follow the same triangular curve: a sharp rise at the product's introduction, a maximum reached sometime thereafter, and then a steady decline to a sustained but low plateau. Marketing-minded manufacturers therefore introduce a new model every three or four years, in hopes of turning that single triangle into a continuous sawtooth wave.
Michael Fremer Posted: Mar 19, 2012 3 comments
As large as a small file cabinet and weighing 223 lbs, MBL's most powerful amplifier, the Reference 9011, is a tour de force of electronics design and implementation that will set you back $53,000 if you're a single-ended stereo enthusiast, or $106,000 if you like pure balanced mono.
John Atkinson Posted: Nov 29, 2011 Published: Sep 01, 1991 1 comments
To judge from the $6400 Mimesis 8, Goldmund walks its own way when it comes to power amplifier design. High-end solid-state amplifiers from US companies like Krell, Mark Levinson, Threshold, and the Jeff Rowland Design Group marry massive power supplies to large numbers of output devices (these often heavily biased to run in class-A), built on chassis of such nonmagnetic materials as aluminum. By contrast, the Mimesis 8 has a magnetic (steel) chassis, and uses a relatively modest power supply, that for each channel based on two main 4700µF reservoir capacitors. The 8 offers just two pairs per channel of complementary output MOSFETs (Hitachi K134/J49). These carry a modest bias current of around 80mA total.
Kalman Rubinson Posted: Nov 23, 2011 4 comments
As I write this, in early August, the global economy is in flux and the stock market gyrates, seeming in stark contrast with the gleaming, luxurious audio components that surround me. Perhaps there is some prescience in my rising interest in reasonably priced, high-performance products, as exemplified by the Oppo Digital BDP-95 universal Blu-ray player, which I reviewed in this column in September. Surely there must be other products that provide truly excellent sound at prices strikingly lower than expected.
John Atkinson Posted: Sep 02, 2011 10 comments
"That's just silly on so many counts, Antony."

I was talking last winter to Musical Fidelity's Antony Michaelson, who had been enthusing about his forthcoming stereo amplifier, the AMS100. It would be physically enormous—almost a yard deep—and commensurately heavy at 220 lbs. Despite its bulk, its maximum rated output would be just 100Wpc into 8 ohms. It would also be expensive, at $19,999. And to cock a snoot at environmentalists and their concerns, the AMS100's output stage would be biased into class-A up to its rated 8 ohm power, meaning that, even when not playing music, it will draw around 10 amps from a typical US wall supply of 120V. This also means that it will run very hot, making the amplifier impracticable for summer use in homes without central air-conditioning. Like mine.