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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.
4 From The Editor's Desk
Home Acoustics, New Workspaces
Editorial By J. Martins, Editor-in-Chief
8 Taking A Listen To Sound
Liaison's DXD Music Sampler By Gary Galo
Gary Galo explores the recording methods of Sound Liaison and discusses whether the
company's DXD sampler, The Visual Sound, actually reflects its stated goal of bridging the gap between the studio and the listeners.
16 NAD M10 Masters Series Streaming Amplifier
By Stuart Yaniger
Stuart Yaniger reviews the compact but mighty M10 Masters Series Streaming Amplifier from NAD Electronics, which combines performance, an attainable price, and powerful features including a network streamer and the latest Dirac Live room correction with Bass Control.
46 The Internal Life Of Vacuum Tubes
By Jan Didden
A few years ago, Jan Didden designed a high-voltage delay unit and shared its details in a 2019 audioXpress article. The unit will delay the high-voltage for a tube amp until the heaters are at operating temperature. As so often happens in audio, arguments pro and con raged without a clear resolution. So Didden found several sources, which he thought were credible, and this article is the result of his investigations, fed by those sources.
54 The APR-17 Aperiodic Loudspeaker (Part 1)
Starting The Build By George Ntanavaras
In this two-part article, George Ntanavaras shares the details of his latest project — the APR-17 loudspeakers. The design features a compact, two-way, stand-mounted loudspeaker. Its main feature is the
"aperiodic loading" of the woofer.
Acoustics Special Features
32 Acoustic Solutions Round-Up 2020
From Acoustic Comfort to Productivity By J. Martins
For this year's Acoustic Solutions Round-Up, we have taken a more diversified approach. First, we focus on home environments, listening spaces, and adapting spaces for communication and remote collaboration applications. Second, we highlight a few useful solutions for acoustic measurement and acoustic testing in product development.
42 The Elephant In The Lab
By Jim DeGrandis
When specifying acoustic materials, it is common to consult the lab reports to analyze the performance information so we can calculate their effects on reverb time, clarity, privacy, articulation, transmission, and more. Jim DeGrandis looks at some of the challenges we face moving
forward — and why they will need to be addressed.
28 Testing Acoustical Systems
By Richard Honeycutt
62 The Early Development Of Hollow-State Mixers
By Richard Honeycutt
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