power amplifiers

A Simple Amplifier Distortion Test

I was testing an amp a few years ago to find out the clipping point. I used a test CD with sine waves and an o-scope connected across the speaker cables. I turned up the volume and watched for the sine wave to distort.

I wore shooting-type hearing protectors. Every time I saw the wave form distort, I heard - through the hearing protectors - a hard, grating, irritating sound. I noted the volume control setting.

Acoustic Imagery Atsah Power Amplifiers

The Acoustic Imagery Atsah power amplifiers are rated at 400 Watts per mono chassis and carry a list price of $8995 per pair. Besides a power rating that would be a good fit in a system of any size, the amplifiers have a signal-to-noise ratio of 128 dB, which means they can be expected to add very little of their own character to the musical signal passing through.

Aesthetix Calypso Signature Preamplifier & Atlas Stereo Power Amplifier

This review took over a year to come to fruition. I had been in contact with Musical Surroundings, the distributor of the Aesthetix product line, for several years. Garth Leerer, the head of Musical Surroundings and a nice guy, offered for me to pick up the Calypso Signature preamplifier at the close of last October’s Rocky Mountain Audio Fest.

Antique Sound Labs 1006-845(DT) Power Amplifiers

Dynamic…extended...powerful. These are the initial impressions when I first heard the Antique Sound Labs 1006-845(DT) mono power amplifiers. Since this was my first exposure to the 845 tube, I didn’t know quite what to expect.

Atmasphere M60 mk. II.2 OTL tube amplifiers

NOTE TO READERS: (Year 2006) Atma-sphere has been asked repeatedly over several years to comply with 10 Audio's policy on quotes (please see the bottom of the Home Page). They continue to refuse this simple courtesy.

Balanced Audio Technology VK-220 & VK-250SE Power Amplifiers

These two amplifiers are children from the same BAT family and have similar BAT sound qualities. The 125W per channel VK-220 ($3000) and the 150W VK-250SE ($7000) employ mosfets in their output stages. Both amplifiers are fully balanced designs and have XLR input connections. Both amplifiers weigh 75 pounds and measure 19” wide x 6.5” high x 16” deep.

Bryston 2.5B Cubed Power Amplifier

The new Bryston 2.5B3 "Cubed" power amplifier continues the evolution of the well-received line of power amplifiers from Bryston, Ltd., of Ontario, Canada. The 2.5B3 is the lowest power model in the current Bryston power amplifier lineup. If more power is needed, there are Cubed models with 200 WPC, 300 WPC, 600 WPC, and 1000 WPC.

Bryston 3B SST Stereo Power Amplifier

This has been one of the easiest products to review. Installation was very simple due to the excellent labeling on the connectors and switches, there were no sharp edges to be careful of on the nicely finished heatsinks, and the amplifier worked perfectly from the moment it was first turned on.

Bryston 3B SST2, 4B SST2 and 7B SST2 Power Amplifiers

The 10Audio review of the Bryston 3B SST, which appeared in July, 2003, concluded with the statement, “The 3B SST is a very listenable amplifier with no significant faults, tremendous drive and cohesion to the real message of the music, all in a very easy-to-live-with package at a bargain price.” A couple of sonic issues were noted, including “…a

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