audioXpress Magazine September 2025

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audioXpress Magazine September 2025

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.

Different Perspectives
Music and sound reproduction is not limited to one single perspective.
Editorial By J. Martins
Opinion is the ideas expressed by a person. Perspective is the point of view from which they view a situation.* The lines between the two don't seem to be well understood. Perspective helps raise awareness of new ideas and methods. I welcome a writer's specific judgment or belief about an issue, as long as it is based on evidence and analysis. I believe in the value of perspective as a way to shape methods, sometimes the whole foundation of an entire approach. That always helps to inspire valid research efforts—even if to prove otherwise. In audioXpress December 2017, we published an interesting article about a different approach to provide the best listening environment for dipolar and multi-directional speakers (omnidirectional), and even directed radiation patterns for specific purposes. In "Educated Reflections," Gary Eickmeier explained why eliminating reflections is not the best approach in a listening room, and how he developed a completely different approach, enhancing the results with "speakers that are renowned for their spaciousness, depth, and 3D imaging." The information detailed in the article, illustrated with how to achieve the results described, intrigued a lot of audioXpress readers, and inspired some to try it out for themselves.
---> Different Perspectives.

5 Supporting Companies

Features
28 An Image Model Theory For Stereophonic Sound
By Gary Eickmeier
This thought-provoking article reflects a lifelong
pursuit of an improved listening room experience,
with an approach to audio reproduction that puts
"sound in rooms," not directly into ears. Expanding on
prior work, this article upholds that the stereo image
is not a psychoacoustic "trick" fooling the brain into
hearing something that isn't really there; it is the very
real physical placement of sounds in rooms.

36 Audinate Dante Virtual Soundcard
Pro And Universal Audio Apollo x16D
Audio Interface
Setting Up A Dante Network
By Philipp Paul Klose
Audinate launched Dante Virtual Soundcard Pro (DVS
Pro), a software solution offering higher channel
capacity and virtual machine installation. This
provided audioXpress with an enticing opportunity
to explore the possibilities of the industry-leading
audio networking solution, precisely as Universal
Audio launched the Apollo x16D audio interface for
Dante networked audio systems. Responding to the
popularity of audio networking solutions for studios
and stage, the Apollo x16D also enables the acclaimed
UAD plug ins to work directly over Dante.

44 Audio-Speech Processing And Microphone Arrays
By Harshal Shah
This article offers a general overview of where the
technology is headed and examines the impact of
geometry, noise sources, signal processing limitations,
and edge AI on wearable audio system performance.

50 Phase Delay, Group Delay, And Circuit Sensitivity Basics
By Paul Marchese
Selective filters are crucial for maintaining signal
integrity in all audio applications. This article explores
how phase delay and group delay are key parameters
when filtering signals, ensuring minimal distortion, and
how phase and amplitude sensitivity help predict how
to match a circuit to a desired gain and phase response.

56 A Power Supply Filter
Linear Vs. Switched-Mode Power Supplies
What Is the Best Choice?
By Thomas Perazella
After hearing comments about the high-frequency noise
on the output of switched-mode power supplies (SMPS)
and the need to replace those units with a large and
expensive linear supply, Thomas decided to test the
concept by making a filter for the output of an SMPS
feeding an Intel NUC he used as a music server and he
compares it with a lab-grade linear power supply.

Residential Installation
Market Update
8 Connected Home Audio And Home Theater
By J. Martins
Technologies for residential audio, including home audio
integration products, continue to evolve at a consistent
pace. This update provides a broad overview of the
latest trends and innovations in home audio and home cinema.
From wireless multiroom to AES67, Dante, immersive audio,
and new ways to enjoy Dolby Atmos at home.

20 High End Munich 2025
One More Time Open For Business
By Ward Maas
The 42nd edition of the High End show (May 15-18) marked
a significant transition in the history of this international audio
trade show. Next year, the High End show is moving from Munich,
Germany, to Vienna, Austria, where there's more room to grow.
With every corner of the MOC Event Center sold out for 2025,
the show delivered a very successful transition. Here are
some highlights.

Columns
Hollow-State Electronics
62 Build Your Own Guitar Amp
By Richard Honeycutt
So you want to build your own hollow-state guitar amplifier?
There are several ways to go about it. Read on to learn more.

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