Solid State Power Amp Reviews

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.

Musical Fidelity's "Supercharger" concept is simple, which is perhaps why no one had thought of it before: If you love the sound of your low-powered amplifier but your speakers are insensitive, or you just need more loudness, you insert the high-power Supercharger amplifier between your low-powered amp and speakers. The Supercharger loads the small amplifier with an easy-to-drive 50 ohms, and, in theory, has so little sonic signature itself that it passes on the sonic signature of the small amp unchanged, but louder.

Founded in 1925, Luxman has long been one of Japan's most highly regarded audio manufacturers. Throughout the 1970s and into the 1980s, Luxman's tube preamplifiers and power amplifiers occupied the top shelves of high-performance audio retailers, and to many older American audiophiles, the Luxman name is as familiar and esteemed as those of such storied American brands as McIntosh and Marantz. Luxman's combination of rich, warm sound, superb build quality, and indelible industrial design made its products fully competitive with other brands then considered among the world's best.

It was a hot, humid, New York City evening in early August, and I was thankful to be sitting in the air-conditioned dark of Avery Fisher Hall, up in the Second Tier, for a Mostly Mozart concert. Listening to cello soloist Alisa Weilerstein in Osvaldo Golijov's hypnotic Azul, I was suddenly jolted by an explosive mix of primitive cello sonorities, accordion, and staccato riffs on ethnic percussion instruments. My thoughts turned to the importance in music of both power and delicacy, and of how Bryston Ltd.'s 28B-SST, a 1000W monoblock power amplifier, was designed to address both.

How much amplifier power do you need? Most audiophiles figure a maximum of a few hundred watts per channel—beyond that, you're wasting your money or showing off. Others think that anything more than a few watts will mess up an amplifier's musical coherence or "purity," so they stop there and find uncommonly sensitive speakers, usually compression horns with cone woofers.

The last Classé power amplifier I reviewed, back in November 2004, was the imposing Omega">http://www.stereophile.com/solidpoweramps/1104classe">Omega Omicron monoblock ($20,000/pair), which made glorious sound with the Revel">http://www.stereophile.com/floorloudspeakers/302">Revel Ultima Studio speakers. But things change. First, my reference speakers are now B&W">http://www.stereophile.com/floorloudspeakers/1205bw">B&W 802Ds. Second, my system now has three front speakers, supplemented by two B&W 804S speakers for surround sound. While a quintet of Omicrons would undoubtedly be dandy, five such monoliths would take up so much space that I'd be wondering about their effects on the room's sound. With so many channels, it seemed time to investigate whether a multichannel amp could carry the load.

Talk about going from the ridiculous to the sublime. One day I'm reviewing the $139 Sonic">http://www.stereophile.com/solidpoweramps/1006sonic">Sonic Impact Super T power amplifier, and the next day Krell Industries delivers their $10,000 Evolution 505 SACD/CD player, $15,000 Evolution 202 preamplifier, and their $30,000/pair Evolution 600 monoblocks.