audioXpress Magazine      September 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

Dolby Atmos is relatively easy for anyone desiring a modern home entertainment room.
Editorial By J. Martins
When I interviewed Tony Ostrom, president of the Wireless Speaker and Audio (WiSA) Association, in May 2019, there was clear excitement in the industry about the full promise of a home theater system simplified with wireless audio. This was largely motivated by LG Electronics supporting the WiSA technology in its range of OLED smart TVs, while other TV manufacturers were signing the WiSA Ready initiative and getting ready to launch WiSA Ready TVs, creating strong momentum. We seemed to be closer to that significant promise – often mentioned by WiSA members – that a home cinema system should be unpacked, set up, and ready to be enjoyed in a matter of minutes. The television, we all agreed then, was increasingly at the center of that solution due to the ability to directly stream content, movies, gaming, music, and more.
---> Figuring It Out.

5 Supporting Companies

Features
22 Dayton Audio iMM-6C USB-C Calibrated Test Microphone
Acoustic Measurement Unchained
By Stuart Yaniger
As mobile devices embrace USB-C, the options for
audio measurements expand significantly, making it
more reliable, universal, and convenient. The Dayton
Audio iMM-6C offers a calibrated measurement
microphone for Apple and Android tablets and
smartphones at an unbelievably low price.

30 Open-Baffle Subwoofer Simulation With AKABAK
By George Ntanavaras
This article describes an experiment with an openbaffle
subwoofer, using the AKABAK simulation
software created by R&D Team and a comparison with
near-field response measurements.

38 Joachim Gerhard On Low Noise Phono Stages
Design Considerations And Circuit Topologies
By Jan Didden
Ask audio industry insiders and audiophiles alike
about Joachim Gerhard, and chances are that they
mention the many high-performance speakers he has
designed over the years. But he also has a great track
record for designing phono preamps. This interview
explores that aspect of Joachim's career.

46 Derived From Elliptic
Analog Crossover Filters With Fast
Roll-Off Behavior
By Charlie Laub
Derived from Elliptic (DfE) crossovers offer improved
characteristics compared to existing filter types and
can be implemented via passive, analog active, and
IIR digital means. The combination of a relatively
flat sum, a narrow and steep transition band, and
well-controlled group delay position them as higher
performance alternatives to traditional loudspeaker
crossovers.

54 Easy-To-Build Moving-Coil Phono Preamplifier
By Sam Dulaney
Very high-quality phono preamplifiers are always
in demand for an increasing number of vinyl
aficionados, music enthusiasts who have an LP
collection with material that is not available in any
other format, and many others who would like to
transfer that unique material to digital format. This
project describes an easily constructed, moving-coil
phono preamplifier.

Residential Installation
Market Update
8 Residential Integration And Home Theater
Smart Audio Moves
By J. Martins
This market update discusses some of the latest trends
and audio technologies that relate to residential installation,
custom integration, and home theater. From audio
networking to multichannel solutions and digital signal
processing to support these applications.

Columns
Hollow-State Electronics
62 Leo Fender And His Legacy: 1960s And 1970s
By Richard Honeycutt
The previous article in this Hollow-State Electronics
column reviewed the early history of Leo Fender and
Fender Musical Instruments in its early years. This
article explores the many hollow-state Fender guitar
amps released from the early 1960s to 1968, and
subsequent Leo Fender's ventures.

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