Audioscenic Amphi Technology High Dimensional Sound

This article describes how Audioscenic's Amphi Technology effectively enables an evolution in 3D sound and immersive reproduction through loudspeakers. Audioscenic developed a sound reproduction technology that allows for the real-time adjustment of spatial audio systems, providing an effective and natural ability to hear in three dimensions without the need for the listener to be constrained within a specific sweet spot.

This article reviews a patent awarded to Teppei Yamada, on behalf of Zorzo Co., Ltd. (Tokyo, Japan), describing an original design of a low-frequency enclosure system incorporating multiple woofers inter-coupled in a manner similar to what is known as an isobaric or compound woofer enclosure. James Croft reviews other approaches to the concept, starting in 1954 with a patent granted to Harry F. Olson on a dual, compound woofer system and later "reinvented" and popularized by Linn Corp., in 1975. In the new patent, the inventor uses an enclosure with as many as 12 woofers, all seriously coupled through individual air chambers

This article is a detailed review of the intriguing AVAA C214 Digital Active Bass Absorber from Swiss studio monitor and high-end speaker specialist PSI Audio. The concept is more or less the same as the AVAA C20, which PSI launched in 2017. the first commercially available analog active bass trap. Now, with the AVAA C214, PSI has introduced a digital controlled active bass trap that's better suited to deal with room modes below 150Hz in listening spaces and small studios rooms. For this review, the solution was tried and tested in two different spaces and applications.

This article reviews a patent awarded directly to inventors Anthony Allen Bisset (Oakland, CA) and Quang-Viet Nguyen (Aldie, VA), for a coaxial horn speaker design. In his review, James Croft looks back at multiple multi-driver horn topologies and compares the unique aspects of the CCPS Horn Speaker System, highlighting the positive attributes and benefits of the invention, to deliver both increased acoustic quality and increased power density.

This article offers a timely update about the evolution of measurement microphones and the reasons for common choices for automotive measurement applications. The article also expands on current discussions about standard approaches for automotive in-cabin acoustic measurements, including the recent AES TC-AA proposed measurement techniques for automotive audio. A great overview of how measurement microphones can meet new requirements, given the emergence of new technologies, new infotainment options, improved calls, active noise cancellation, and rising consumer expectations.

The market for True Wireless Stereo (TWS) earbuds has seen significant growth driven by advancements in technology and increasing consumer demand for high-quality audio experiences. Hybrid designs, which incorporate two types of drivers, are steadily entering the market as an option that allows OEMs to deliver superior sound quality. This article explores how different hybrid driver configurations enhance audio quality, user experience, and acoustic precision.

In another example of cutting-edge experiments that deserve recognition, Joerg Panzer (R&D TEAM, Germany) and Patrick Macey (PACSYS, UK) detail an investigation of the sound pressure response and radiation impedance of a loudspeaker horn driven by an electro-dynamic transducer. The two authors (and creators of the respective software tools) combined measurements with simulation software using finite and boundary element methods and explored the associated issues with meshing for each method.

Confronted with the impossibility to conduct reliable measurements in the low-frequency domain for his DIY speaker project, George Ntanavaras explores the alternative of relying solely on simulation software. To validate the design of an open-baffle subwoofer using the AKABAK software, created by German company R&D Team, he also explores the transition from measurements to simulation. His experiments contrast the near-field response measurements of his loudspeaker with the accuracy of the simulation using AKABAK.

Designing Audio Circuits and Systems is a surprising effort by the author and one that deserves careful exploration. A true compendium of lessons in audio that reflects Bob Cordell’s long-standing track record of designing audio equipment as well as advanced test equipment. The vast content contained in this book makes it an essential reference for anyone designing audio circuits, including excellent “hands-on” material for anyone starting to experiment in audio electronics.

Although the sound field in a room at low frequencies is one of the most discussed topics, approaches to dealing with room modes are typically treated as an optimization problem, and not correctly defined. This article explores a different strategy: the so-called Double Bass Array layout, using several subwoofers placed in a pattern, on the front and rear walls. Using advanced simulation techniques in order to understand what truly happens in the resulting room mode behavior, sound pressure levels, and resonances, this article builds upon existing research (Geddes, Welti, Devantier, et al.)