Solid State Power Amp Reviews

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Ken Micallef  |  Sep 02, 2022  |  9 comments
Reviewing LKV Research's Veros PWR+ power amplifier in the September 2020 issue, Senior Contributing Editor Herbert Reichert enthusiastically opined, "the class-D LKV amp played equally rich and atmosphere-soaked through the entire audio band. It did atmospheric dreamy like class-A does atmospheric dreamy." Herb concluded, "Sound quality and music enjoymentwise, the LKV Research Veros PWR+ amplifier sits on a higher mountain than any other class-D amp I've encountered."
Michael Fremer  |  Aug 17, 2022  |  28 comments
Some time ago, an amplifier in for review caught fire when first powered up. I don't mean it smoked and sizzled and shut down—I mean that actual flames shot through the top grate. Fortunately, I was able to grab a kitchen fire extinguisher and douse the thing with foam. (Sorry, this was decades ago, and I don't remember the brand, but I think the company had a fire sale and was shut down.)
Jason Victor Serinus  |  Jul 01, 2022  |  64 comments
Like an immense night bird aloft in the gold'n sky.
I should like to sail off towards islands of flow'rs
While list'ning to the perverse sea singing
In its old and bewitching rhythm.

It took some time to figure out why, in the middle of auditioning Rotel's Michi S5 stereo power amplifier ($7499.99) with the room-shaking opening of Richard Strauss's Also Sprach Zarathustra, Ravel's far subtler and perfumed setting of Tristan Klingsor's lyrics from Shéhérazade came to mind.

John Atkinson  |  Apr 22, 2022  |  9 comments
As I started to write this review, the news broke that Sound United, the owner of Boston Acoustics, Bowers & Wilkins, Classé, Definitive Technology, Denon, Marantz, and Polk, was going to be purchased by a corporation that makes medical instruments. Such consolidation is not new. China- and UK-based International Audio Group (IAG) was one of the first organizations to acquire iconic audio brands. IAG owns Audiolab, Castle, Quad, Leak, Mission, and Wharfedale. In 2009, they purchased Luxman.
Jason Victor Serinus  |  Feb 23, 2022  |  6 comments
Like the proverbial pot of gold, darTZeel's golden equipment beckons. That, at least, is how it felt in January 2010, when John Atkinson and I ended our coverage of T.H.E. Show Las Vegas in the room shared by darTZeel, Evolution Acoustics, and Playback Designs. Listening to darTZeel's discontinued NHB-458 monoblocks (footnote 1) and NHB-18NS reference preamplifier (now updated), I was transfixed by the fullness of the system's midrange and overall beauty of the sound. "It was as though the system was opening its heart and welcoming us in," I wrote. "That's how warm and nurturing the sound was."
Jason Victor Serinus  |  Dec 24, 2021  |  31 comments
The $50,000, 176lb Accustic Arts AMP V (pronounced Amp Five) is the heaviest, tallest, most powerful, most expensive stereo amplifier to enter my audio system. With rated power of 900Wpc into 8 ohms, 1360Wpc into 4 ohms, and 1500Wpc into 2 ohms, the AMP V, which stands proud at the top of the Accustic Arts amplifier line, surpasses my reference D'Agostino Progression M550's rated power into 4 ohms by 260Wpc.
Jason Victor Serinus  |  Oct 20, 2021  |  19 comments
We audiophiles so frequently get caught up in the pursuit of perfection that some have attempted to rebrand high-end audio as "perfectionist audio." But is it even possible for a single piece of audio gear, let alone an entire audio system, to attain perfection when there's no common agreement as to what "perfection" means? It's easier to cue up a Nirvana track than to find the way to audio nirvana.

Michael Fremer  |  Jun 24, 2021  |  3 comments
In an April 2020 press release, the McIntosh Group announced that its subsidiary brand Sumiko, which was cofounded by the late Dave Fletcher and distributes Sonus Faber and Pro-Ject among other high-performance brands, had secured distribution rights for Rotel Electronics in the US and Latin America. That press release prompted memories of a Rotel RP-3000 direct drive turntable I once owned, fitted with a Lustre GST arm.
Kalman Rubinson  |  May 21, 2021  |  22 comments
Power amplifiers should be boring. They have a single, well-defined function: Make the input signal large enough to run a loudspeaker so that it makes sound at levels suitable for listening to music. Generally, controls and features are few or none. Peter Walker of Quad famously defined the ideal amplifier as a "straight wire with gain." That's just one feature: gain.
Jason Victor Serinus  |  May 12, 2021  |  8 comments
Once upon a time, in the early days of class-D amplification, the very notion that the ELAC (ELectroACoustic) Alchemy DPA-2 Stereo/Mono Power Amplifier ($1495 each) uses a class-D output stage would cause some readers to turn the page (footnote 1). But as class-D amplifiers established their pedigree as bona fide hi-fi components, audiophiles have begun to embrace the notion of a lightweight, cool-running amplifier that will not dramatically increase the electric bill and that, when properly executed, can be quite musical.
Ken Micallef  |  Apr 29, 2021  |  15 comments
Big changes are afoot at Mytek. First up: The Mytek Brooklyn AMP+, the newest version of the compact, class-D Brooklyn AMP. The AMP+ is already in production.

In my 2018 review of the original Brooklyn AMP, I wrote that the class-D amplifier exuded "a consistent sense of truthfulness, striking resolution that was never analytical, spacious soundstages, superb dynamics, and some of the 'blackest' backgrounds I've ever heard...with the right recordings." I continued, "The AMP let me revel in its reproduction of the low end, with zero overhang or bloat, and profoundly impressive retrieval of micro- and macrodetail—but in doing all this, its touch was always light and never surgical."

Thomas J. Norton  |  Feb 11, 2021  |  First Published: Mar 01, 1995  |  1 comments
Amplifier designers have frequently looked for ways to marry the advantages of tubes to those of solid-state devices. Hybrid designs of various stripes have appeared over the years, most of them using tube input stages with transistor output stages, eliminating the major weaknesses of tube amplifiers: eg, they run hot, are unreliable in that tubes have a finite life, are more expensive than a similarly powerful solid-state design, and have power-hungry output tubes and output transformers.
Michael Fremer  |  Dec 23, 2020  |  6 comments
Talk about a Scarlet Letter. The term class-D amplification, which describes PS Audio's new M1200 monoblocks, exists only because another amplifier innovation had already parked in the "C" space. Soon after appearing in high-performance audio gear, class-D became synonymous with "digital amplification" in part because, like early CDs, many listeners found the sound glary, hard, and unpleasant. Besides, class-D is related to "pulse width modulation" and requires a low-pass filter to block high-frequency pulses—that sure sounds digital. But they're not (see Bruno Putzeys sidebar).
Herb Reichert  |  Dec 03, 2020  |  9 comments
I spent my childhood summers on the Reichert family farm near Turtle Lake, Wisconsin, where, inside the red 1880s barn, my uncle Harold played 78rpm records for his cows.

He used a wind-up Victrola sitting on a shelf directly in front of the cows, just below a framed reproduction of an Alpine landscape painting. He said the music and the mountain scene relaxed the cows, causing them to give better milk. Harold played the same Gustav Mahler symphony every day.

Jason Victor Serinus  |  Nov 26, 2020  |  15 comments
"Oh goody!" thought self, to self: "Another Gryphon component to review." As eloquent and revelatory as that statement may be, there's an even more illuminating backstory.

I had been aware of Denmark-based Gryphon Audio since the advent of the Gryphon Exorcist, a now-discontinued demagnetizer that cost far more than your average break-in CD, but I only began to encounter Gryphon electronics at audio shows a few years ago. While at first they seemed available for review only as a complete package, Jim Austin was able to arrange for me to review the Gryphon Ethos CD player–D/A processor ($39,000).

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