Everything That's Audio in audioXpress December 2023

audioXpress December 2023 includes a market overview of multiroom audio, Brent Butterworth writes about new ways to measure ANC earbuds, and Stuart Yaniger measured the new Axign and GaN Systems Class-D audio amplifier board. Richard Honeycutt writes about tubes, BJTs, JFETs, MOSFETs, and ICs, and Dimitri Danyuk, discusses JFETs in audio circuits. Douglas Self explains how to optimize variable-frequency tone controls, and Jan Didden shares his eDD direct-drive amplifier project.

Exploring some pressing topics in headphone technology, in this article Hans W. Gierlich addresses the requirements for effective performance testing of communication headsets that use active noise cancellation (ANC) technologies, test setups, testing equipment, and setup conditions needed to correctly assess ANC performance. From the right choice of artificial ears and the latest ITU-T recommendations in that domain, to ANC performance measurements and talk-though performance. This article was originally published in audioXpress, June 2022.

HEAD acoustics is hosting another online seminar, this time focused on ANC headset testing. The event is free to register and will repeat over three different time zones on February 23 and 24. During the seminar, HEAD acoustics will recap how the company's systems have helped the popular forum for headphone enthusiasts, Head-Fi.org, to properly evaluate ANC headphones at a time where new technologies and designs keep being introduced.