audioXpress Magazine      October 2024

  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.

From the Editor's Desk
Brand Value And Brand Values
Navigating complex structures of conglomerates, alliances, and joint ventures.
Editorial By J. Martins
After an inspiring Audio Engineering Society (AES) conference on Automotive Audio in Gothenburg, Sweden, I had to reflect on the things I learned about the automotive industry. One of the most interesting aspects was meeting the teams from the multiple tiers of the automotive supply chain, and most importantly meeting professionals from the manufacturers, from the brands, and from the audio brands that are now embedded into OEM vehicles. A pleasant surprise was to meet the large audio team from Ferrari. The famous Italian luxury sports car manufacturer, founded in 1939 by Enzo Ferrari, is one of very few original automobile "name brands." Not surprisingly, Ferrari is also one of the world's strongest brands and one of the most valued car manufacturers by capitalization–fourth after Tesla, Toyota, and BYD, and surpassing Mercedes-Benz (those things fluctuate and change quickly, of course). Ferrari is now entering a new age with advanced, fast, hybrid, and fully electric vehicles.
---> Brand Value And Brand Values.

5 Supporting Companies

Features
38 Experimental And Theoretical Investigation
Of An Unusually Shaped Horn
By Joerg Panzer and Patrick Macey
This article details an investigation of the sound
pressure response and radiation impedance of a
loudspeaker horn driven by an electro-dynamic
transducer. The research combines measurements
with simulation software using finite and boundary
element methods and explores the associated issues
with meshing for each method.

46 Double Bass Arrays
By René Christensen
The double bass array (DBA) layout uses several
subwoofers placed in a pattern, on the front and rear
walls. This article explores modeling and simulation
of the resulting room mode behavior, sound pressure
levels, and resonances, building upon existing
research.

52 Eliminating Speaker Doppler Distortion
By Reinhold Lutz
Most people would agree that a perfectly linear
loudspeaker driver would not generate distortion.
And they would be wrong. Reinhold Lutz explains and
offers a remedy.

58 Lessons In Audio
A Review Of Bob Cordell’s Designing Audio Circuits And Systems
By Jan Didden
Bob Cordell has a long-standing track record of
designing audio equipment as well as advanced test
equipment. He has published numerous articles and
papers on power amplifier design and distortion
measurement. In July, Cordell released a new book,
aptly titled Designing Audio Circuits and Systems,
which includes pretty much everything electronic
there is to be found in audio. Jan Didden gave it a
serious look and shares what he found.

62 Joachim Gerhard On Low Noise Phono Stages
The discrete INA Design
By Jan Didden
In the first part of this interview Joachim Gerhard
discussed the design considerations and circuit
topologies for low noise phono preamps, culminating
in the very low noise and Flexible Phono Stage (FPS)
design. In this second part, he will further develop his
design ideas with the Discrete INA design, a discrete
input stage instrumentation amplifier topology.

Automotive Audio
Show Report
8 5th International AES Conference On Automotive Audio
Sharing The Knowledge In Gothenburg
By J. Martins and Roger Shively
From June 26-28, 2024, audioXpress attended the 5th
International Audio Engineering Society (AES) conference on
Automotive Audio, in Gothenburg, Sweden. It was an
historical event for the AES, reflecting the strong momentum
in the automotive sector, where audio, acoustics, and
passenger-oriented applications are front and center in the
transition to electric vehicles.

22 Advances In Measurement Microphones
For Automotive Testing
By Santiago Rayes
Expanding on current discussions about standard approaches
for automotive in-cabin acoustic measurements, this article
explains how measurement microphones meet those
requirements, as applications evolve.

Columns
Sound Control
30 Scientific Comparisons Of Loudspeakers
By Richard Honeycutt
Loudspeaker history is (for better or worse) a diverse journey,
full of exploration and experimentation, innovations, and
breakthroughs. With such great diversity of loudspeaker
types, learn what determines listener preferences and
corresponding success between all those different design approaches.

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