All items in category Theory Articles
Searching for a Unicorn Part 1: Measuring Voltage Regulator Ripple Rejection
by Brian Lowe

Searching for a Unicorn Part 1: Measuring Voltage Regulator Ripple Rejection

In this article Brian Lowe shares a fascinating journey in his search for a "Unicorn" that is measuring voltage regulator ripple rejection - or power supply rejection ratio (PSRR). Lowe is the founder and principle engineer at Belleson, LLC, and he has devoted a lot of time to this fascinating "quest." This article was originally published in audioXpress, May 2019.
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Practical Test & Measurement: Mastering Wireless Multi-Tone Testing
by Andrew Taylor

Practical Test & Measurement: Mastering Wireless Multi-Tone Testing

This article explains the issues resulting from measuring a wireless audio connection and how wireless multi-tone testing can help us to overcome those obstacles. The article is particularly focused on the needs of manufacturers and designers of modern wireless audio devices and offers valuable insights on multi-tone testing, a technique that has been around for many years, and which Klippel perfected in its own multi-tone measurement module (MTON). This article was originally published in audioXpress, December 2020.
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Practical Test & Measurement: What to Measure for Quality Control of Audio Devices
by Dan Knighten

Practical Test & Measurement: What to Measure for Quality Control of Audio Devices

In this Test & Measurement article from Dan Knighten (Audio Precision), the author focuses on the practical question of manufacturing test strategies and objectives and shares what measurements reveal about the device under test, offers suggestions for specific measurements, and provides techniques for various devices and scenarios. This article was originally published in audioXpress, November 2020.
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Communications: Testing and Optimizing Strategies for Conference Terminal Equipment
by Hans W. Gierlich

Communications: Testing and Optimizing Strategies for Conference Terminal Equipment

Following up on the two Communication articles published in audioXpress October 2020, Hans W. Gierlich, from HEAD acoustics GmbH, a top expert in his field, contributed this great overview article. With most company employees working from home and the trend toward decentralized organizations and remote collaborations, where webinar and conferencing services are the new way of communication, this a timely topic. This article was originally published in audioXpress, November 2020.
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Thin-Film High-Frequency Transducers (Part 2) - The LT2/LT6 Ribbon Transducers
by Igor Levitsky

Thin-Film High-Frequency Transducers (Part 2) - The LT2/LT6 Ribbon Transducers

In its August 2020 edition, Voice Coil featured an article by experienced speaker designer Igor Levitsky on The Advantages of Thin-Film High-Frequency Transducers. In a follow-up Spotlight article the author returns to expand on the development and design aspects of the Radian Audio LT2/LT6 Ribbon Planar transducers - its more recent, commercially available project, in which he continues to be involved. This article was originally published in Voice Coil, September 2020.
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Thin-Film High-Frequency Transducers (Part 1) - The Advantages
by Igor Levitsky

Thin-Film High-Frequency Transducers (Part 1) - The Advantages

In its August 2020 edition, Voice Coil featured an article by experienced speaker designer Igor Levitsky, highly recognized in the industry for developing some of the best planar magnetic speaker and headphone drivers for some of the most reputed brands, focusing precisely on this type of technology. It seems clear that we will see more and more headphones and speakers using thin-film drivers, as the industry is now perfecting the use of different types of diaphragms and materials. The August 2020 edition of Voice Coil includes the first part of this article, completed in the September 2020 edition.
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Voice Coils: A Tutorial
by Mike Klasco

Voice Coils: A Tutorial

Mike Klasco (Menlo Scientific) provides an overview on how to specify or manufacture voice coils. In this reference article, Mike Klasco recaps on voice coil basics, bobbin materials and sizes, collars, winding techniques, configurations, tips and tricks and wire types and considerations - a valuable, concise compendium of unique knowledge. This article was originally published in Voice Coil, August 2020.
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Practical Test & Measurement: Fast and Reliable End-of-Line Acoustic Defect Detection
by Wolfgang Klippel

Practical Test & Measurement: Fast and Reliable End-of-Line Acoustic Defect Detection

This article discusses end-of-line testing, a crucial step in production, which requires very specific procedures and measurements. Specifically, the authors focus on testing irregular acoustic defects (also known as Rub & Buzz) to reduce the test time and optimal solutions to speed automatic testing in a production environment. This article was originally published in audioXpress, September 2020.
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The Internal Life of Vacuum Tubes
by Jan Didden

The Internal Life of Vacuum Tubes

A few years ago, Jan Didden designed a high-voltage delay unit and shared its details in a 2019 audioXpress article. Many people built it and like it, but others said that it would be totally unnecessary. As so often happens in audio, arguments pro and con raged without a clear resolution. So Didden thought this was something he needed to get his head around. He found several sources, which he thought were credible, and this article is the result of his investigations, fed by those sources. This article was originally published in audioXpress, August 2020.
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Soundmatters and BDNC's Super-Shallow High-Excursion Speakers
by Mike Klasco

Soundmatters and BDNC's Super-Shallow High-Excursion Speakers

Mike Klasco (Menlo Scientific) writes about "a very cool" concept from Soundmatters, the company's UPstage speaker design, a new speaker product category and the next trend from the people that invented the soundbar. The sophisticated engineering implemented by soundmatters into the UpStage compact high-performance audio system was also the launch platform for BDNC's high-power, flat glass woofer that uses a 0.2 mm glass diaphragm. This article also explains what manufacturers need to know about the BDNC glass diaphragm, high-excursion, ultra-low profile woofer technology.
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