In this issue

It’s About the Sound
8 Exploring Master Quality Authenticated (Part 1)
Measuring the Difference
By Ron Tipton
14 Back EMF Phase Relationships in Moving-Coil Loudspeakers (Part 1)
Identifying, Quantifying, and Modeling Back EMF
By Andy Lewis
24 Acoustics in Performance
Review by J. Martins
26 Schiit Audio’s High-Value Ideas
By Oliver A. Masciarotte
Oliver Masciarotte has an opportunity to sit down with Jason Stoddard, to discuss his company Schiit Audio, a high-value brand available at reasonable prices.
32 Transformers for
Tube Amplifiers (Part 1)
Transformer Basics
By Gerhard Haas
This article series explains the fundamental properties of transformers, examines the important criteria for rating and building a transformer, and analyzes how the transformer circuitry affects the overall result.
42 DIY Tube Amplifier Heat Management Options
By Patrick Brunner
Tube amplifiers generate the most heat per watt of audio output. Our author shares some methods to greatly increase the performance and the reliability of your DIY tube amplifier.

46 TubeSociety 2A3-300B SE Amplifier Project (Part 2)
Saving the Best for Last
By Menno van der Veen
In the first part of this article series, Menno van der Veen described four 300B single-ended (SE) amplifiers that he built as prototypes for his students. Here, he describes the fifth and final amplifier, detailing the power supply section and the construction.
Hollow-State Electronics
58 Comparing Output Waves of Tubes, FETs and BJTs
By Richard Honeycutt

Exploring Master Quality Authenticated (Part 1) - Measuring The Difference

By now, I expect every music enthusiast has heard about Master Quality Authenticated (MQA) and how the high-frequency content is folded, origami fashion, into the low-frequency region. An MQA decoder (DAC) unfolds the highs back to their proper spectral location. The theory sounds great but because we can’t directly hear this upper register, how do we know what’s actually there?

6 mins

Acoustics In Performance

In this book, Richard Honeycutt details “all you need to know about good acoustics and sound systems in performance and worship spaces.” audioXpress and Voice Coil readers will be familiar with Richard A. Honeycutt’s writings, including audioXpress’ Hollow- State Electronics column, dedicated to exploring all tube-related electronics, and his Sound Control column, dedicated to everything in acoustics. Richard has also contributed to Voice Coil since 1994, so the author knows his subject matter.

3 mins

Schiit Audio's High-Value Ideas

Unless you’ve been away from hi-fi for the past few years, you’ve probably heard of Schiit Audio, a high-value brand available at reasonable prices. Over the years, Schiit Audio owner Jason Stoddard and I have talked at trade shows and I recently caught up with Jason to talk about his company.

10+ mins

DIY Tube Amplifier Heat Management Options

The objective of this article is to illustrate some methods to greatly increase the performance and reliability of your DIY tube amplifier. I’m only discussing DIY tube amplifiers since they generate the most heat per watt of audio output and are hopefully of the most interest to you. Most designs that I have seen in audioXpress have the tube and the transformers on top of the chassis and everything else under the chassis. Most of the amplifiers look nice and work okay, but I think there is a better way!

7 mins

Read all stories from audioXpress

audioXpress Magazine Description:

Step into the realm of audio, sound technology, and the latest developments in the field with audioXpress Magazine. We're delighted to introduce you to this publication, your ultimate source for all things related to audio, audio equipment, and the art of sound reproduction.

audioXpress Magazine, published by KCK Media Corp., is not just a magazine; it's your portal to the world of audio and sound technology.

As you explore the pages of audioXpress Magazine, you'll find a world of content that celebrates the magic of sound and audio technology:

* Audio Equipment: Dive into the world of audio gear, equipment reviews, and the latest advancements in the industry.
* Sound Technology: Explore the science of sound, audio engineering techniques, and the art of sound reproduction.
* DIY Audio: Learn about do-it-yourself audio projects, audio kits, and tips for crafting your own sound systems.
* Industry Insights: Stay informed about the latest trends, innovations, and news in the audio and sound technology field.
* Music and Sound: Immerse yourself in the world of music, audio production, and the stories of sound enthusiasts.


audioXpress Magazine is your essential resource for celebrating the magic of sound, understanding audio technology, and connecting with a community that values the science and art of sound. Subscribe now and become part of a community that appreciates the power of sound and music.