audioXpress Magazine July 2026

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audioXpress Magazine July 2026

audioXpress remains the authority on audio and reproduced sound by connecting manufacturers and distributors with developers, buyers and consultants around the globe! It's readers are the audio product designers, consultants, integrators, DIY enthusiasts, opinion leaders and your best customers. All of them agree that the coverage of trending topics, unique in the audio industry, make audioXpress a must read.

Every month, audioXpress combines the best educational articles on topic such audio electronics, speaker and headphone design, amplifiers (from tube to Class D), acoustics, practical test and measurement, audio engineering praxis, and standards. audioXpress provides inside stories on new audio developments, on R&D Stories, the most complete objective reviews of innovative products and software, and selects some of the best DIY audio projects from worldwide experts.

Audio Human Extensions
What remains to be understood, remains to be described.
Editorial By J. Martins
I believe language is the largest market opportunity for the audio industry—essential for augmented reality and any applications that augment our human abilities, which I have characterized as human extensions. Language and voice are intrinsically connected and are cornerstones of today's audio product designs both to expand human interfaces, but more importantly as the "code" that connects our experience with technology. I am always fascinated when I see how people explore our current generative AI engines—mostly conditioned to natural language prompts—in different languages and how that "language" interface results in diverse outcomes. As the interactions with AI-powered products and solutions that are based on large language models (LLMs) expand to different levels, from work to entertainment, we are now witnessing the rapid transition to AI agents, which theoretically should be agnostic to human languages. Yet that's absolutely not the case—and the reason why I believe this is such a promising field for the audio profession. Something I predict will be (at least) a decade-long transition for language and voice technologies to evolve.
---> Audio Human Extensions.

5 Supporting Companies

Features
8 Born To Be Connected
Why Passengers Finally Get To Have Fun Too
By Sven Eisenhardt
In-car infotainment has entered a new phase. Vehicles
are becoming more connected and capable than ever.
Yet one key element can still be improved: a truly
personalized experience for everyone in the car, not
just the driver.

14 A Software-Defined DAC Using Delta-Sigma Modulation
By Joe Golightly and Henk Muller
This article investigates how to playback digital audio
without using a hardware digital-to-analog converter
(DAC). Instead, the authors explain how to implement
a DAC primarily using software, with just an amplifier
and filter in hardware.

22 EPC9192 Reference Design For EPC2307 eGaN FETs
A New GaN Technology Option For Audio Amplifier Designs
By Stuart Yaniger
Efficient Power Conversion (EPC) has launched
the new EPC9192 reference design, enabling high
power and high efficiency Class-D audio amplifiers
in a modular design. Here, audioXpress reviews the
EPC9192 to confirm the performance capabilities.

46 Designing the Dynaco ST-70 Series 3
It's All About the Bass
By Dan Fraser
Having created a new version of the Dynaco ST-70
Power Amplifier that received excellent reviews, Dan
Fraser's reward is writing this series of technical
articles. In this second article he details the power
supply design and the choices in terms of filter
capacitors, rectifiers, and power transformer. All
options that help define the bass for the Dynaco ST-70
Series 3.

52 FC-100: A JFET Testing And Matching Device
By George Ntanavaras
This project shares the design and construction of the
FC-100, a device developed for testing and matching
both P-channel and N-channel JFETs. Essential for
high-performance audio circuits, this simplifies the
process of matching complimentary JFET parts.

Immersive Audio Departments
30 MPEG-I Immersive Audio The Standard for Realistic VR / AR Sound
By Andreas Silzle and Sascha Disch
Extended Reality still rises and falls on one thing many
users notice first: sound. The MPEG-I Immersive Audio
standard brings believable 6DoF audio, scene metadata,
and a normative renderer into a single interoperable
framework for VR, AR, and mixed reality.

40 The Challenge Behind Believable XR
By Arto Lehtiniemi
As Extended Reality moves to everyday use, the audio
layer must keep pace with motion, context, and environment,
or the illusion breaks. That is why spatial rendering, head
tracking, and ultra-low-latency delivery are central to the
next generation of immersive experiences.

42 Building Flexible Immersive Home Audio Systems
With UWB Spatial Sensing And Adaptive Rendering
By Clement Arnardi
Immersive audio is not just about sound quality—it's about
intelligence, adaptability, and removing setup friction. By
working closely with NXP Semiconductors, StreamUnlimited
has created a platform that integrates precise UWB ranging,
offering audio OEMs a scalable solution for flexible remote
speaker placement and user-friendly immersive home
audio systems.

Columns
Hollow-State Electronics
64 Reintroduction Of The 90s Mesa Triple Rectifier Solo Head
The Back Story
By Richard Honeycutt
In March, Mesa/Boogie, part of the Gibson staple of American
instrument brands since 2021, announced the return of its
influential high-gain amplifier: the 90s Dual Rectifier Standard.