All items in category Magazine Articles
Wireless Audio: Ultra-Low Latency Audio Transmission Over Bluetooth LE Audio
by Jonny McClintock

Wireless Audio: Ultra-Low Latency Audio Transmission Over Bluetooth LE Audio

While Bluetooth technology does not provide a complete solution for live performance audio, it still has a key role to play. In particular, the value of a standards-based approach manifests with the availability of low-cost Bluetooth LE-compatible transceivers from a variety of SoC vendors. Building on these readily available devices, manufacturers can engineer systems that are strongly optimized for live and professional applications. But what latency performance targets should those products meet?
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Fresh From the Bench: RME Audio DPS-2 Power Supply and LNI-2 DC Filter and Stabilizer
by Stuart Yaniger

Fresh From the Bench: RME Audio DPS-2 Power Supply and LNI-2 DC Filter and Stabilizer

When RME Audio released the DPS-2 Power Supply and LNI-2 DC Filter and Stabilizer, it left many of its faithful customers intrigued. The two new solutions are designed to improve the performance of its ADI-2 series of converters in critical applications. One is a super low noise linear audio power supply with a unique µfilter and sensor technology, and the other is an active DC filter with galvanic isolation. Stuart Yaniger explains how these two new solutions improve what is already outstanding.
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Non-Linear Amplitude Modulation of Loudspeakers
by Reinhold Lutz

Non-Linear Amplitude Modulation of Loudspeakers

Even a perfectly linear loudspeaker produces two types of distortions because of the movement of its membrane. First Doppler distortions, a.k.a. Phase Modulation (which the author addressed in his October 2024 article for audioXpress), and secondly distortions stemming from the Nonlinear Amplitude Modulation, characterized in this article. More importantly, this article also addresses how these harmonic and intermodulation spectral line distortions can be minimized and eliminated in loudspeakers.
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Eliminating Speaker Doppler Distortion
by Reinhold Lutz

Eliminating Speaker Doppler Distortion

Because of the movement of its membrane, even a perfectly linear loudspeaker produces Doppler distortion, a.k.a. Phase Modulation, and second distortions from the Nonlinear Amplitude Modulation. This article, originally published in audioXpress, October 2024, characterizes and shows how to eliminate Doppler distortion for a good listening experience.
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A Fiber-Reinforced Composite Technology for Vibration Reduction in High-Performance Applications
by Anthony Caiazzo

A Fiber-Reinforced Composite Technology for Vibration Reduction in High-Performance Applications

This article, written by Anthony Caiazzo, Chief Technology Officer and Principal of Countervail Products, details the company’s family of vibration canceling materials featuring a patented approach that has been shown to provide exceptional levels of vibration damping in many common structural configurations. Countervail materials not only cancel vibrations, but they also contribute to the stiffness of the structure and typically don't significantly change the component manufacturing process.
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R&D Stories: Pushing the Boundaries of Active Noise Cancellation
by Stefan Liebich and Johannes Fabry

R&D Stories: Pushing the Boundaries of Active Noise Cancellation

Detailing a different perspective on signal processing, Stefan Liebich and Johannes Fabry bring us the story of how Elevear is exploring what is possible with Active Noise Cancellation (ANC). Offering a great overview about how signal processing works for ANC and transparency in true wireless earbuds, the two Elevear technical minds share their perspective on how the technology roadmap is taking us in exciting directions.
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Audioscenic Amphi Technology High Dimensional Sound
by Marcos Simón and Adam Levenson

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.
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Patent Review: Loudspeaker Apparatus
by James Croft

Patent Review: Loudspeaker Apparatus

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
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Fresh From the Bench: PSI Audio AVAA C214 Digital Active Bass Absorber
by Philipp Paul Klose

Fresh From the Bench: PSI Audio AVAA C214 Digital Active Bass Absorber

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.
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Patent Review: Coaxial Centerbody Point-Source (CCPS) Horn Speaker System
by James Croft

Patent Review: Coaxial Centerbody Point-Source (CCPS) Horn Speaker System

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.
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