audioXpress Magazine      August 2023

  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.

4 The Perception Of Change
There's so much we could all benefit if we evolve our new designs and product developments.
Editorial By J. Martins
As I always like to say: I know that I know nothing, but I'm always learning. (Plato would agree if he had said it) Unfortunately, in the life of a magazine editor I have long learned that there is never enough time to just study and learn. I strongly admire people who have devoted their whole career to study, research, and publish what they learned (many times combined with teaching). That's what I always like about attending conferences, where here and there you come across people and work that shake the foundations of our knowledge and understanding. That was the case recently, when I — together with our technical editor Jan Didden, and a good number of audioXpress authors — attended one of the opening sessions of the 154th Audio Engineering Society (AES) International Convention, held at Aalto University in Espoo, Helsinki, Finland, from May 13th through 15th.
---> The Perception Of Change.

5 Supporting Companies

Features
8 AXPONA 2023
Renewed Vitality On The Home Audio Front
By Oliver A. Masciarotte
The 2023 edition of AXPONA showcased some
innovative products, plus it drew a more diverse and
interesting crowd than in years past. Get an insider's
look at the AXPONA show.

26 SonicEdge Ultrasound Speaker
Modeling And Application
By René Christensen
Acculution has partnered with SonicEdge to
design audio devices using SonicEdge's disruptive
microspeakers for acoustic design. These speakers
represent a paradigm shift in their operation and
acoustic integration, and this article showcases some
of the audio design work.

30 Noise Cancellation In Automotive Audio
What's the Destination?
By Philipp Paul Klose
This article investigates how active noise cancellation
(ANC) can be beneficial in an automotive application
and looks at the challenges and technical implications
in the development phase. It also provides an outlook
for applications, products, and industry adoption.

36 Designing A True Midrange Driver
By Jørn Rune Kviserud
The mid frequencies in a multi-way speaker are often
handled by a woofer. Here we detail many things that
can be done to the driver to improve its properties.

44 Bass Reflex Performance Envelope Part 2
System Analysis
By Gary Gesellchen
Part 2 of this novel approach to estimating the
performance envelope from bass reflex loudspeakers
shows how driver and port sizes determine how loud
and how low a system will play, and how that relates
to generally available drivers.

54 Instrumentation Amplifier-Based Preamplifier Line Stage
By Bruce Gillingham
This article describes a line stage preamplifier that
also includes time-delay-matched, fully balanced
(voltage and impedance) outputs, and adjustable gain.

60 Power Transformer Parameters, Selection, And Testing Part 10
More Transformer Tests
By Chuck Hansen
In Part 10, we continue to test different types of
transformers for leakage flux and external magnetic
shielding, core loss sensitivity, and more.

Acoustics
Market Update
16 Electroacoustic Enhancement And Active Acoustics
By J. Martins
For this year's Acoustics special we are going to look at
Active Acoustics and some of the companies offering solutions
in this increasingly important field. And we start with a
conversation and field experience with E-Coustic Systems,
the pioneers in this field.

Columns
Hollow-State Electronics
50 Visiting The Western Electric Vacuum Tube Factory
By Richard Honeycutt
Planned for some time, audioXpress was finally able to
visit Western Electric in Rossville, GA. Officially established
in 2018, this facility has been continuously producing 300B
single-ended triode tubes since 2020 and is already
expanding production to other vacuum tube models.
Richard Honeycutt shares his guided tour.

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