John Siau writes: The Benchmark AHB2 power amplifier and HPA4 headphone amplifier both feature feed-forward error correction. This correction system is an important subset of the patented THX-AAA™ (Achromatic Audio Amplifier) technology. It is one of the systems that keeps these Benchmark amplifiers virtually distortion free when driving heavy loads. It is also the reason […]
Audio Designers
Interviews and conversations with Audio Designers
Found 143 results
Hello Colin, please be patient with me because although I am an experienced listener I’m not very conversant with the technology that is available today. By this I mean I really just plug in and just listen. However recently I started to think about some of the units I use, In particular a Musical Fidelity […]
Dear Colin, Computer grade parts? What are computer grade parts.. such as Computer grade power-supply caps? Are these type of parts an upgrade and/or better than audiophile grade parts? For example, I’ve heard some people say, “I’ve upgraded my power supply caps in my amp to computer grade caps”. I don’t think I’d want computer […]
Caleb Denison (Digital Trends) writes: We were excited enough to be among the first to receive Pioneer’s new Atmos-enabled Elite speaker system for review, but when the company sent along legendary audio engineer Andrew Jones to install them, that was something else entirely. The man behind the speaker’s design and engineering — whose name is stamped right on the […]
John Siau writes: Benchmark has introduced the new HPA4 headphone/line amplifier with four 256-step relay-controlled attenuators and four 16-step relay-controlled boost amplifiers. Together these form two fully-independent, fully-balanced stereo volume controls. One volume control is dedicated to the line output and one is dedicated to the headphone output. Each has a +15 dB to -122 […]
Hello Colin and may I congratulate you on your resurrection. My question is this. As it is generally agreed that as a consequence of the variation of the mains waveform systems sound different at different times of any twenty four hours, do you do your fine-tuning at a similar time each day for continuity? Or […]
Paul McGowan: We’re comfortable suggesting sound is subjective when it comes to our differences in perception, but then uncomfortable when we speak of it in absolute terms. In other words, we believe the source of sound to be absolute. The perception of sound a matter of personal choice. The dictionary describes subjective as a central philosophical […]
Dear Colin, impedance match of preamp and main amp. I am considering mating a McIntosh Mc602 with a Bat Vk 51se. I noticed the input impedance on the Mc602 is 10K. While most Bat amps are much higher. Do you see a problem with this? It seems I remember at Stereophile I used to know […]
From our archives : Howard Popeck: Not many people know you’re a qualified engineer. What engineering discipline was your first degree? Max: Bachelor of Engineering, Electrical, specialising in communications. Where did you study? University of Western Australia So what happened after that? I accepted a commission in the Royal Australian Air Force where I was […]
Dear Colin, An audiophile friend made the following argument to me: “Stop looking for a new CD player. With a very good to excellent high-end interconnect you will not only improve the performance of the CD, but other downstream components.” I had to disagree with my friend claiming a $400 or $500 IC is not […]
How did your interest in music reproduction start John? I guess I was always into music from a very early age. My Father was an electrical and mechanical engineer and used to build his own Hi-Fi back in the Fifties, so music played a big part in my formative years. You’re probably best known, even […]
John Atkinson ….. One of the things that fascinates me about the field of box loudspeaker design is how few original talents there are capable of designing a model from first principles. Yes, armed with the Thiele-Small papers on bass alignment, an understanding of filter theory, and a working knowledge of the OEM drive-unit field, […]
Gentlemen – what is this ‘thing’ called bi-wiring and will Elsdon Wonfor Audio be making speaker cables that use this tecnique? Thanks. Ron McQueen. {Colin} Dear Ron, bi-wiring is used to stop the reflection signal of one or more transducers affecting the movement or control of another. This can happen and it is caused by […]
From the archives Preliminary notes. Neil’s a busy guy and has kindly agreed to us sending him clusters of three questions on a regular basis while bearing in mind that he’ll squeeze his responses in as and when his schedule permits. There are many things we’d like to ask this designer of fine amplification and […]
Dear Colin, power supply question. How often do we have to turn off our equipment such as power amp, pre amp. cd player , power conditioner ……? Can we leave them on for days while listening on and off or do we have to turn them off after every session of listening? As a general […]
First published in early 2016 Howard Popeck: Hi Kostas. Unusual design, to say the least. What’s led to this? Kostas Metaxas: Hi Howard. After 40 years of creating audio equipment, the last thing that I wanted to produce was “another box with transistors on a heatsink”. I was dreaming of the most spectacular architecture, design […]
Dear Colin, step up transformer noise. I purchased an amp from Europe that needs 240v [ I am on north American voltage].. I bought a step up/step down transformer to equalize the voltage. it works, but the transformer produces noise through the speakers, even when the amp is turned off. the transformer I bought was […]
Hello Raphaël. How did your interest in music reproduction start? Well, I suppose everything starts with music listening during as a youth, with a father playing music, either on a piano or guitar, or on his HiFi system. Then, my father being an electrician and repairing TV sets, meant that I grew up with electronic […]
Dear Colin, Zero autoformers; how to measure impedance please? I got a pair of Speltz zero autoformers recently but when I measure the total impedance, my multimeter sees only 0.4-0.6 ohm no matter what I do. It seems the multimeter could only read the DC resistance from the autoformer itself but not the total impedance […]
Hi Colin. Who if any are your audio designers heroes and why? Thanks. Nigel Beethoven (no jokes please) Hello Nigel. Heroes is a bad thing to have as it puts normal humans on a dais and yet they are human. But the gents and ladies in this complex industry that I put up with; the […]
Hello Dominique. How did your interest in music reproduction start? It began when I was very young. One of my four brothers studied electronics at school and found a job in a French company called Ferisol manufacturing professional electronics equipment for the industry. It was back in 1960/1965. It was the beginning of pop music […]
Our interview with Hiroyasu Kondo—founder of Audio Note Japan, and a legendary figure in his own time—took place during HI-FI ’96 last June at the Waldorf=Astoria. It seemed very natural; the crowd at the Show was very internationalist. Herb Reichert of Audio Note New York found us a quiet corner after lunch, and we sat […]
Hello Colin. From reading your very cogent and helpful answers to those questions here I appreciate that you take the design of power supplies very seriously. I’m writing here out of ignorance of the design process and indeed materials used but I wonder if it’s coming to the point where the next set of advances […]