power amplifiers

Modwright KWA 150 Signature Edition Stereo Power Amplifier - mini-review

This year’s Rocky Mountain Audio Fest was another great show. Even with almost three full days, there is so much interesting gear, new and not-so-new, that I often hurried through the hundreds of components and rooms to be able to see and hear everything of interest.

Nuforce Reference 9 V2 SE Power Amplifiers

I love music. I love not just listening to music, but the whole music experience because there are so many levels and “components” involved in the whole subject. From music composition, to playing instruments, to recording and production, and finally to playing music on component audio systems, the subject is vast, creative, and personal. There is some area for each and every person in which to participate.

Pass Labs X250.5 Stereo Power Amplifier

The Pass Labs X250.5 stereo power amplifier may very well be the world’s best 15 Watt per channel stereo amplifier. Even though the amplifier is rated as 250 Watts per channel, it runs in Class A mode up to 15 Watts, then shifts gears into Class AB for the remainder of the power rating. It is easy to both hear the shift and see the shift.

PS Audio HCA-2 Power Amplifier

Sometimes, there is a very small difference between the winner and the second place finisher. If we observe their actual performance, we may be unable to see any substantial difference at all. There is only a couple percent difference in the DNA of a man and a chimpanzee, but in this case, the difference is immediately obvious. Being close to the top of the food chain is not enough. Put another way, almost good enough...isn't.

PS Audio Stellar S300 Stereo Power Amplifier

The new PS Audio Stellar S300 stereo amplifier is a delightful surprise. At a list price of only $1,499, the sound of the Stellar S300 has characteristics of some of the best amplifiers available, at any price.

QUAD Platinum Stereo Amplifier

The QUAD Platinum Stereo amplifier is the latest in a very long line of hi fi products from QUAD of England. QUAD, which is an acronym for Quality Unit Amplifier Domestic, has been making components since 1953 and has received many awards for the sound quality of their products, including the world-renowned Quad ESL loudspeakers and Quad II vacuum tube power amplifier.

Quicksilver V4 Power Amplifiers

This is not an easy review to write. For several months, the Quicksilver V4 amplifiers have been the primary amplifiers in my ever-changing audio system. I have connected them to four different preamplifiers and four different speakers, and numerous cables and power conditioners. I have replaced the Graham 2.2 tonearm with a Phantom on my Kuzma Stabi Reference turntable.

Response Audio Bella EXtreme 100 Power Amplifiers

I’m speechless. Or wordless. I had quite a lot to say about the new Response Audio Bella EXtreme 100 mono tube amplifiers during the first 400 hours of use while the Teflon® capacitors and other parts were slowly breaking in. Let me tell you a little about the amps themselves, and in the mean time, I’ll try to think of something to say about the way they sound now.

Spread Spectrum Technologies Ampzilla 2000 Power Amplifier

Passion. Our hobby/interest/vocation is all about passion. There is a lot of passion in the high-end audio universe and James Bongiorno, the head of Spread Spectrum Technologies, has a consuming passion for his creations. He has been building and refining the Ampzilla amplifier concept since 1974 and holds a patent on the design. From his Web site:

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