Audio Skies Michael Vamos - YG Acoustics, JMF Audio, Ideon at Capital Audiofest 2025
The Listening Room and Fidelity Imports - Diptyque DP-160 Mk.2 at Capital Audiofest 2025
Fidelity Imports Audia Flight and Perlisten System
Fidelity Imports Wilson Benesch and Audia Flight System at Capital Audiofest 2025
J Sikora Aspire, Innuos Stream 3, Aurender N50, Gryphon Antileon Revelation, Command Performance AV
Bella Sound Kalalau Preamplifier: Interview with Mike Vice
BorderPatrol Zola DAC – Gary Dews at Capital Audiofest 2025
Audio Note UK TT3 Reference Turntable Debut at Capital Audiofest 2025
Kevin Hayes of VAC at Capital Audiofest 2025
2WA Group debuts Aequo Ensium at Capital Audiofest 2025
Capital Audiofest 2025 lobby marketplace walk through day one
Lucca Chesky Introduces the LC2 Loudspeaker at Capital Audiofest 2025
Capital Audiofest 2025 Gary Gill interview
Sponsored: Pulsar 121
Acora and VAC together at Capital Audiofest 2025
Scott Walker Audio & Synergistic Research at Capital Audiofest 2025: Atmosphere LogiQ debut
Sponsored: Symphonia
Sponsored: Symphonia Colors

LATEST ADDITIONS

Real-Life Measurements

As mentioned by two readers in this month's "Letters," amplifiers are used to drive loudspeakers but are almost exclusively measured into resistive loads. The reasons for this are twofold: 1) real loudspeakers both produce neighbor-annoying sound levels and tend to break when driven with typical amplifier test signals; and 2) the question as to which "standard" loudspeaker should be used is impossible to answer---at least the conventional resistive loads are consistent and repeatable.

Continue Reading »

Apogee Stage & Mini-Grand loudspeakers

As Laura Atkinson shuffled into my listening room one evening, she spied the Stage loudspeakers tucked away in the corner. "Hey, Dick, those look like Apogees, but they're kind of small." Rising to the occasion, I responded with: "Honey, I shrunk the Apogees." At roughly 3' tall by 2' wide, the Stage is far from intimidating; it even feels more compact and is certainly much cuter looking than the old Quad ESL. Yet Junior's resemblance to the rest of the Apogee family is unmistakable. The canted baffle, the vertical tweeter/midrange along the inside edge of the baffle, and the pleated aluminum-foil woofer clearly bear the imprint of the larger Caliper and Duetta models. It's almost as though Apogee started shrinking the Duetta until the price tag shrank below two kilobucks.
Continue Reading »

Jeff Rowland Design Group Model 2 power amplifier

I remember having a conversation with an audiophile some time ago about the thorny subject of choosing an amplifier. He was convinced, on the basis of an article he had read in <I>Stereo Review</I>, that all amplifiers of a given power rating sound pretty much the same. Although he was sufficiently well off to buy just about anything on the market, he didn't want to waste his money. He chose the amplifier for his system by going through the <I>Audio</I> Annual Directory Issue, calculating the price:watt ratio for each amplifier that was listed, and then bought the amplifier with the lowest price/watt figure that had enough power to drive his speakers. He didn't do any comparative listening and didn't consider buying anything that cost more for the same power, because he knew already that it wouldn't sound any different.

Continue Reading »

Krell KSA-50S power amplifier

In the fall of 1982, I had just become the Editor of the English magazine Hi-Fi News & Record Review. Hi-fi was in a state of flux. The Compact Disc had just made its debut in Japan, but the British and American launches were six months and a year away, respectively. The Linn orthodoxy prevailed about the role of the source in system performance, but there was no agreement about what was and was not important when it came to enhancing the musical experience. "Objectivists" insisted that amplifiers and even loudspeakers had pretty much reached a design plateau where no further improvement was necessary or even desirable, while "subjectivists" were fragmented. All I was aware of was that my system, based on Celestion SL6 loudspeakers, needed more of an undefinable something.
Continue Reading »

Quad 405 power amplifier

This is something we don't see too often: an entirely new approach to power amplifier design. As Quad points out in its literature for the 405, class-A operation of transistors provides the lowest distortion, but drastically limits the amount of power an output transistor can deliver without overheating. (Most transistor amps use class-AB output operation, in which each of a pair of power transistors handles part of each signal cycle and shuts down during the other part. Imperfect synchronism between the two halves causes the familiar "crossover distortion," which accounts for most solid-state sound. In class-A operation, each output transistor draws current though the entirety of each signal cycle, eliminating the crossover transition but doubling the amount of time current is drawn, and thus tending to cause the transistor to heat up more.)
Continue Reading »

Etymotic Research ER-4S Canal Phone earspeakers

The cab's outside, the plane leaves in 50 minutes. Let's see...<A HREF="http://www.stereophile.com//amplificationreviews/530/">HeadRoom Supreme</A>, <A HREF="http://www.stereophile.com//accessoryreviews/531/">HeadRoom Bag</A>, portable CD player, CDs, Etymotic ER-4S Canal Phones....Oh, yeah&mdash;mustn't forget luggage or plane tickets. Guess I'm set to go.</I>

Continue Reading »
Advertisement
Advertisement
Advertisement