audioXpress Magazine      June 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 Sound Of Silence
Audio systems offer a great entertainment experience when listening to music.
Editorial By J. Martins
In Automotive audio is a fascinating topic that audioXpress has been increasingly exploring. We have received an enthusiastic response from both our readership and the industry, but our strongest motivation has been the unprecedented level of activity and innovation taking place. Looking back 10 years, when we envisaged the new format and the roadmap for this publication, I confess that this was not something I anticipated. Yes, Tesla started selling its Model S in 2012 and we should have foreseen how fully electric vehicles would impact the audio experience as the familiar noise of the combustion engine was suddenly removed.
---> The Sound Of Silence.

5 Supporting Companies

Features
32 Audioscenic: From Vision To Product
By Marcos Simón
Audioscenic is an innovative 3D audio beamforming
technology company spun off from the University of
Southampton. This article shares the story so far, as
Audioscenic continues its groundbreaking journey
exploring consumer applications for its forward-thinking
approach to spatial audio.

42 The AP-2 Amplifier
With Analog Signal Processor for the
ACH-01 Accelerometer
By George Ntanavaras
This project is a welcome upgrade of the original
ACH-01 accelerometer system used for measuring
and studying the vibration behavior of a loudspeaker,
cabinet, stands, and more. The updated AP-2
amplifier received new useful features, some of which
were suggested by users of the first design.

50 Misconceptions In The Audio Industry
By René Christensen
Because there is no simulation without a sound theory
foundation, this article explores some apparently
simple examples of misconceptions, such as clarifying
what actually happens when a loudspeaker moves.

54 A (Z)OTL with 300Bs Part 2 — The Final Details
By Thomas Perazella
In Part 1 of this article, Thomas Perazella presented
the famous David Berning ZOTL amplifier and
discussed its unique circuitry. In Part 2, he describes
his adventure to dismantle and rebuild the amp, and
how he fit it on a new chassis for its next owner.

60 Power Transformer Parameters, Selection, And Testing Part 8
Additional Transformer Core Types And Their Attributes
By Chuck Hansen
The initial group of articles detailed the history
of transformer cores, their construction methods,
materials, various testing methods, their losses,
commercial power quality, and the design of current
transformers. In Part 8 of this series, our author
focuses on additional transformer core types and their
advantages and disadvantages.

Automotive Audio
Market Update
8 The Changing Audio Ecosystem In Electric Vehicles
By Roger Shively and J. Martins
The rapid shift to plug-in hybrid and full-battery electric vehicles
is having a significant and long-lasting impact on how audio
systems are integrated into cars. This Market Update
explores exciting possibilities for the overall automotive experience.

20 Perspectives On Automotive Sound Design
In the Era of Electric Vehicles
By Adam Levenson
From combustion engine vehicles to fully electric vehicles,
from automotive sound systems to sound design and synthesis
for the car itself, everything is changing in the automotive
industry. Two members of the DSP Concepts automotive team,
John Whitecar and Steve Ernst, offer valuable insights on
how things are evolving.

26 DSP Module Application And Tuning Procedure In Automotive Audio
By Philipp Paul Klose
This article offers a primer on how to approach acoustic
measurements, the practical application of DSP in car cabins,
and details about how to make use of the collected measurement data.

Columns
Sound Control
38 An Exploration Of Rock And Pop Venues
Acoustic and Architectural Design
By Richard Honeycutt
For this month's article, Richard Honeycutt reviews the book
Rock and Pop Venues: Acoustic and Architectural Design, by Niels Werner
Adelman-Larsen, recently updated witha Second Edition.
This book was referenced in previous Sound Control articles.

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