audioXpress Magazine      December 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 Wireless And Wired
The convenience of wireless audio transmission
for all those applications.
Editorial By J. Martins
Although unintended, this issue of audioXpress offers
a very interesting comparison between the thriving
installation market and the complexity of consumer
mainstream technologies, while also revealing the
convergence trends. From wired to wireless, the two
Market Updates featured in this issue detail technology
evolving and adjusting to different requirements at its own pace.
In the process that will eventually lead us to a world of
Wireless Audio, many efforts and even companies that
pioneered the early streaming audio and multiroom
systems have been left behind.
---> From The Editor's Desk: Wireless And Wired.

5 Supporting Companies

24 The Proof Is in the Testing
By Adrián Lara Moreno and Christian Bellmann
The Klippel Near Field Scanner (NFS) System was
used for the development of Holoplot's X1 Matrix
Array compensation algorithms, which was the topic
of a September 2022 audioXpress article. This joint
article by Holoplot and Klippel offers a deep dive
into the tuning and performance adjustments of the
innovative technology from the Berlin, Germany-based
company.

44 An Approach To Designing RIAA Networks
By John Ellis
This technical article addresses an issue that often
keeps designers busy when calculating the RIAA
parts' values for a phono amp. The reason is that the
surrounding circuit parts always somehow influence
the RIAA correction. So it is often a matter of trial and
error. With the author's method, it is easier to quickly
calculate the correct values.

50 The LNA-100
A Low Noise Amplifier With Filters And A RMS Voltmeter
By George Ntanavaras
This project describes the design and construction
of the LNA-100 device, which comprises a low noise,
high gain amplifier with three different gain settings,
six filters for bandwidth restriction, and a True RMS
voltmeter that gives a DC voltage at its output.

58 Power Transformer Parameters, Selection, And Testing
Part 2 — Transformer Cores and Their Construction Methods
By Chuck Hansen
In the second part of this article series, Chuck Hansen
details the history of transformer cores and shares
information about their various construction methods.

Columns
Hollow-State Electronics
64 Unusual Tubes
By Richard Honeycutt
Most aficionados of hollow-state electronics are familiar
with the tubes commonly used in classic or contemporary
audio amplifiers. In this article, we explore some of the
less common tube types used for audio applications.

8 Installation, Distributed Audio, and Multiroom
By J. Martins
Following the previous Market Update on residential
integration, audioXpress explores the latest audio installation
trends and solutions. Complementing the residential
perspective, the article also addresses the latest audio
multiroom approaches and technologies, an area
that is clearly on the verge of serious evolution in 2023.

Market Update — Wireless Audio
30 Improving Wireless Audio
Part 2 — Evolution and Exciting Perspectives
By J. Martins
Even though key technologies remain in development,
wireless audio evolution beyond Bluetooth offers some
very promising perspectives to the industry. This update
looks at the efforts and the most promising platforms and
technologies for wireless audio.

40 Using Ultra-Wideband Technology
Wireless Delivery of Audio and Multimedia
By Frederic Nabki, Nicolas Paillusseau, and Ronald Rinkenbach
For tomorrow's audio and AR/VR devices, Ultra-Wideband (UWB)
technology provides high throughput, low latency, and low
power connectivity for body and personal area networks —
even in congested environments. UWB complements
Bluetooth and Wi-Fi with high-performance
and mobile-friendly short-range wireless connectivity.

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