Pure Acourate Sound Project: Greater Than the Sum of Its Parts

audioXpress traveled to Germany to learn about the Pure Acourate Sound Project, which aims to create the lowest distortion sound in a listening room. The initiators of the Pure Acourate Sound project are Ulrich Brüggemann, Markus Grelka, and Ralf Höllmann. The partners involved in this unique system are Purifi Audio, Okto Research, GIK Acoustics, Klippel, Roon, AudioVero, Rose Handwerk, and Joachim Gerhard. Ahead of the presentation at the May 2024 Munich High-End show, audioXpress offers a preview of the project.

The Hypex Nilai500DIY 500W Mono Power Amplifier Kit is new DIY benchmark from the company's dedicated DIYClassD brand. The kit is specified to deliver 500W with 1% THD at 4 ohms, improves output noise and idle losses significantly, and comes with a discrete buffer stage and voltage regulators. The article, originally published in July 2023, offers an extensive review with measurements of the full kit, including the PS500 DIY power supply and DIYClassD preamplifier kit.

Have you recently completed a project and are interested in sharing your build or product design concept with others? Consider writing an article for audioXpress magazine. We welcome new ideas on analog or digital circuits, hardware and software, wired and wireless. We also publish articles on sound theory, tubes, and vintage audio. Submit an article. Be paid for publication.

This article by Doug Ford describes a design for a (relatively) simple passive-matrix surround-sound decoder and the interesting things discovered by the author during the process. The decoder features an analog time delay, implemented with several cascaded all-pass networks and it improves sound system quality by eliminating out-of-phase information.

A design based on superior op-amps used in audio applications. A high-quality amplifier must drive high-quality headphones. This article describes the design and construction of a high-quality, high-power headphone amplifier.