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audioXpress Magazine

audioXpress Magazine      August 2024

 

audioXpress August 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
Generating Sound
Automotive industry leverages noise reduction, active acoustics, and sound generation.
Editorial By J. Martins
The audio industry is truly fascinating for the wide variety of perspectives and disciplines that ultimately converge around the same phenomenon that is sound. At audioXpress we address this from a broad perspective of the many applications of audio technologies, products, and market segments, from consumer to professional applications, from recording and reproduction, creation and manipulation, simulation and auralization. While sound is inherently associated with noise, vibration, hearing, perception... and acoustics. As we never get tired of saying, acoustic science is where everything starts, determining how sound and audio systems behave in practice. Acoustics is an integral part of audioXpress' mission, together with every other critical discipline in audio development and product design. In our mission to truly reflect the evolution of audio technology I personally attend events dedicated to many of these disciplines of audio and respective application segments.
---> Generating Sound.

 

5 Supporting Companies

 

Features
8 AXPONA 2024
The Biggest And Best Yet
By Oliver A. Masciarotte
AXPONA (Audio Expo North America) is North
America's largest event for audio enthusiasts, music
lovers, and audio manufacturers. Get an insider's view
of the three-day experience, expanded this year with
manufacturers from all over the world and more than
200 listening rooms filled with the newest technology.

 

30 IK Multimedia ARC Studio
Out-Of-The-Box Accuracy
By Philipp Paul Klose
With the ARC Studio, IK Multimedia introduces a
new DSP market contender for room and speaker
correction. With its unique hardware concept and
attractive price point, ARC Studio targets home studio
needs and stereo system users, seeking playback
chain improvements.

 

42 Automotive Audio Bus (A2B) Part 2
Two Alternative Power Schemes
By Brewster LaMacchia
In Part 1 of this article, we looked at the history
of Analog Devices' A2B and the improvements with
each generation. The new AD2437 enables a range
of multichannel digital audio applications with larger
total distances. It also supports alternative power
schemes that deserve some investigation.

 

audioXpress August 2024

 

50 Low-Pass And High-Pass Notch Filters
By Charlie Laub
This article takes us on an exploration of the lowpass
and high-pass notch responses, and proposes
methods for their implementation, and the design
of elliptic filters. Get to know these lopsided
"Cinderellas" of the notch family.

 

54 The American Wire Gauge
Standard And π
By Paul Marchese
American Wire Gauge (AWG) is a logarithmic stepped
standardized wire gauge system used since 1857
and is colloquially referred to as "gauge." This article
discusses the odd value of the AWG step size and a
possible explanation of its value.

 

56 The Super Transformer
A High-Fidelity Active Direct Box
By Todd Schneider
This project describes a high-performance, simple,
compact, and cost-effective direct box in a traditional
guitar pedal board format. This transformerbased
direct box (also called a DI, which stands for
"Direct Inject") is suitable for musical instruments
(specifically electric guitar or bass) but also
professional audio applications.

 

 

Acoustical Solutions
Market Update

16 An Active Approach For Great Acoustics
By J. Martins
In this year's update we catch up on the latest
developments in active acoustics, expand
on acoustic panels and materials, and discuss
some innovative acoustic treatment and
first-approach passive solutions that deserve attention.

 

Columns
Sound Control

36 Active Acoustic Enhancement Systems
By Richard Honeycutt
From tape echo machines to the first digital audio
delay and digital reverberation systems, this article
discusses the genesis of acoustic enhancement
systems, from which modern active acoustics were born.

 

Hollow-State Electronics
62 Leo Fender And His Legacy: 1940s And 1950s
By Richard Honeycutt
A musician, engineer, inventor, and entrepreneur, Leo Fender
created the first thin solid-body electric guitar to be
mass-produced and was responsible for a series of tube
guitar amplifiers that are highly prized even today. This
article explores the story of Leo Fender and the importance
of his products and designs.

 

 

 

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