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audioXpress Magazine

audioXpress Magazine      September 2022


audioXpress Magazine September 2022


  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
4 From The Editor's Desk
The Better Mousetrap
Improving upon an existing object or concept.
Editorial By J. Martins


5 Client Index


40 AES 2022 Automotive Audio International Conference
Immersive and Energized
By Roger Shively
Over the course of three days and two nights, June 8–10,
the Audio Engineering Society's 2022 International
Automotive Audio Conference in Dearborn, MI, served
as a great event for everyone in the automotive audio
community to reconnect. This article sums up the
trends, the topics, and the demonstrations.


46 Audio Objects as Platform Technology in Vehicles
By Christoph Sladeczek
This article describes a new workflow comprising the rendering
of audio objects for the production and tuning process, as
well as the implementation on resource-limited hardware.
As audio will play a significant role in upcoming interior
concepts, object-based audio provides a novel interface
to create immersive and interactive audio content
significantly reducing the complexity of the audio production
workflow for car manufacturers.


audioXpress Magazine September 2022


52 The Double-Dipole Subwoofer
Take Two
By George Ntanavaras
Looking back at some speaker projects published in
Speaker Builder and the first years of audioXpress, we find
concepts and designs that are still being built today and
frequently referenced. That is the case with the Double-
Dipole Subwoofer, which deserved to be revised and republished.


Hollow-State Electronics
62 300B Triode Single-Ended Versus Push-Pull
Versus A 6CA7 Power Pentode
By Richard Honeycutt
In this article, our hollow-state expert compares the
performance of a Western Electric Model 91A using 300B
triodes against a push-pull amp with no overall negative feedback.



Focus On Speakers
Market Update
8 Speaker Design and Testing Tools
By J. Martins
In this article we revisit some of the tools that speaker
designers, developers, and DIY builders have at their
disposal, from free software to the latest hardware, from a home
bench and R&D to production line testing.


20 Design and Development of the Holoplot X1 Matrix Array
By Michael Kastner
Following the return of trade shows in 2022, the lid has been
lifted on a whole host of innovations in the pro audio space,
and among them Holoplot has emerged as a standout
with its X1 Matrix Array sound system. This article is an
inside account about how the Holoplot team has been pushing
the boundaries of what is possible in the pro audio space.


28 Motion Feedback Desktop Subwoofers for Nearfield
Studio Monitors
By Zami Schwartzman
This article describes the design of a pair of desktop
subwoofers that can extend the response of compact
studio monitors to the most desired 30Hz to 60Hz range.
The author perfected his own accelerometer-based
motion feedback (MFB) designed, fully assembled plate
amplifiers with MFB control, crossover, and voice coil
thermal protection that can be matched with any
low-frequency driver.


34 Replacing IEC 60268-5 (Part 1)
What Comes Next and Why
By Geoff Hill
Because it's important to understand the work taking place
on loudspeaker measurement standards and the progress
with the International Electrotechnical Commission (IEC)
standards efforts, this article summarizes the evolution.




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