audioXpress Magazine      January 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 Audio Industry In 2022
Audio companies should continue to explore
the "product drop" concept.
Editorial By J. Martins

5 Client Index

Market Update — Speaker Technology
8 Constantly Evolving Technology
By Mike Klasco and J. Martins
There's a lot happening in speaker technology.
Drivers and transducers are constantly evolving,
and innovations are happening not only in design,
construction, and materials but also in the engineering
approach. In this Market Update we will focus once
again on innovations in speaker technologies.

Features
22 Properly Equalized
Best Practices for Loudspeaker
Equalization and Tuning
By Charlie Hughes
A loudspeaker system should sound good and
measure accordingly. Biamp's principal acoustic
engineer offers some recommended guidelines
that will help develop good equalization and tuning
practices, but also will go a long way in improving the
overall sound quality, regardless of the application.

26 Dan Alexander Audio:
A Vintage Odyssey
Review by Scott Dorsey
Dan Alexander began buying and selling used guitars
in 1967 at the age of 17. Until the late 1990s, he
also built recording studios, sold hundreds of Neve
mixing consoles, thousands of tube microphones, and
"old" recording equipment. His memories are now
compiled in a book. Scott Dorsey reviews the book
and discusses its merits.

30 Olive Pro Hearing And Bluetooth Earbuds
The Challenge of Hearing Enhancement
By Brent Butterworth
The Olive Pro personal sound amplification product
got mixed reviews, and the company has temporarily
paused its sales efforts in the US. Brent Butterworth
tested the product, then talked with the company to
find out what happened and their plans for the future.

40 Designed For Growth
Enabling Product Differentiation
For TWS Development
By Raj Senguttuvan
Knowles announced the availability of a new
development kit for true wireless stereo (TWS)
earbuds, centered on the capabilities of its AISonic
family of audio edge-AI processors and key audio
processing partnerships. This article details the
opportunities for TWS development and helping
manufacturers to differentiate their newest designs.

44 Thinking About DC Power Supplies (Part 2)
Seven Potential Circuits
By Frans de Wit
Following an introduction to multiple
circuit types suitable for high-quality
audio designs in Part 1, the author now
considers seven different circuits for
electronic DC power supplies.

52 An Experience With Premium Vinyl Records
By Mike Harkins
Mike Harkins embarks on an experiment
to discover if today's audiophile vinyl
records and pressings are better and if
modern expensive vinyl reissues are as
good as has ever been pressed.

62 OMNI Tower VII
An Omnidirectional Tribute
By Ken Bird
Our veteran speaker builder ventures into
omnidirectional territory with a twist. He
proposes a floorstanding speaker design
that relies on its four sides and is based
on a concept devised by the late David B.
Weems, using eight drivers, including two
Piezo tweeters.

Columns
Sound Control
28 What Did They Say?
By Richard Honeycutt
One frequent complaint that both acousticians and
sound engineers hear is, "I can't hear what they're
saying!" While this sounds simple, the complaint is
fraught with complexities. In this article, our columnist
shares some actual experiences with real and perceived
speech intelligibility issues, before exploring measuring
methods for quantifying it.

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