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audioXpress Magazine

audioXpress Magazine      July 2022

 

audioXpress Magazine July 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 Good, Bad, And Real Assessment
Adapting our economy to a remote / online model.
Editorial By J. Martins

 

5 Client Index

 

Features
8 AXPONA 2022
Back to Listening in Person
By Oliver A. Masciarotte
Score one for audiophiles. Our AXPONA expert found
it a distinct pleasure to gather once again in the
Chicago, IL, suburbs for the 2022 edition of the
Audio Expo North America, better known as AXPONA.
Everyone, exhibitors and attendees, had good fun
while listening to some exceptional systems. In this
show report, Oliver Masciarotte details some of the
highlights.

 

32 Audio Bandwidth Measurements
In The Presence Of Significant Out-Of-Band Noise
By Bruce E. Hofer
This article, written by the co-founder and chief
analog designer at Audio Precision and published in
2005, remains 95% on target for 2022. As the latest
generation of Class-D audio amplifiers challenges our
standard analyzers' ability to measure, Bruce Hofer
already debated the fundamentals with the early
instrumentation of the time.

 

38 Some Notes How Far Have Things Evolved?
By Stuart Yaniger
As a complement to Bruce Hofer's article, Stuart Yaniger
conducted some reference measurements of his own.

 

audioXpress Magazine July 2022

 

40 The Cranberry Companion
A High-Performance Preamplifier Using Modular Construction
By Bruce Heran
To complement his own "Cranberry" stereo vacuum
tube amplifier, our DIY enthusiast decided to build a
preamplifier inspired by a modular approach, using
solid-state components exclusively. The project features
a phono, line, and headphone preamplifier stages.

 

48 Egg Speaker Amp And System
By Reinhard Metz
Inspired by Tom Perazella's egg-shaped speaker
project, the author was motivated to build his own
version and explore his take on the design with an
active crossover tri-amp approach using a miniDSP
4x10HD system feeding a dedicated six-channel
amplifier, including Purifi 425W Class-D units.

 

54 Building A Guitar-Controlled Synthesizer
Input Section & Pick Detector
By Ethan Winer
Previous articles described circuits Ethan Winer
developed for his project, which uses an electric guitar
instead of a keyboard to control an analog synthesizer.
This article continues with two pieces needed to
process input from an electric guitar: the input section's
preamplifier and noise gate, and the pick detector.

 

 

Market Update Audio Amplifiers
16 Evolution Of The Species
Better, Smarter, Integrated, Connected, And Multichannel
By J. Martins
In this Market Update we recap the most interesting events and announcements in the
field of audio amplification, a key product and technology segment for the audio industry overall.

 

Hollow-State Electronics
60 Triode, Pentode, Or Beam Power Tube
By Richard Honeycutt
What is the best way to achieve a triode sound with its low-order harmonics? This article
discusses the practical approaches and implications.

 

 

 

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