All items in category Magazine Articles
OEM DSP Active Line Level Crossovers from Danville Signal
by Vance Dickason

OEM DSP Active Line Level Crossovers from Danville Signal

The advantages of active DSP crossovers are long recognized and a majority (about 90%) of today's professional audio loudspeakers and studio monitors are powered loudspeakers using also some kind of integrated DSP. Based in Minneapolis, MN, Danville Signal Processing has long been supplying high-performance DSP crossovers and DSP modules to the OEM market. In this article, Vance Dickason writes about the range of DSP Active Line Level Crossovers available from the company. This article was originally published in Voice Coil, September 2021.
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DaS AuReality — 3D Loudspeaker Technology
by Joe Hayes

DaS AuReality — 3D Loudspeaker Technology

A fully patented 3D loudspeaker technology resulted from a multi-year effort of Diffusion at Source (DaS) and elliptical soundfield speaker design approaches. DaS AuReality has evolved out of work known as “Acoustic3D” from an Australian-based company and is now being commercialized by Vastigo, Ltd. (Vastigo.com), headquartered in Singapore. This article offers all the details into the unique approach followed by the development and multiple applications segments envisioned by the inventors. This article was originally published in Voice Coil, September 2021.
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Patent Review: The Zoltan Bay Loudspeaker Patent
by James Croft

Patent Review: The Zoltan Bay Loudspeaker Patent

In this article, James Croft reviews a loudspeaker patent granted in 2015 to Zoltan Bay (Tiszaalpar, Hungary). The invention, which is the foundation for the BRS tweeter used in a remarkable series of Bayz Audio loudspeakers, basically describes a horizontally, omnidirectional transducer, using a multiple set of four to eight rolling, half-cylinder film diaphragms arranged in a circle to form a generally omni-directional radiator. This article was originally published in Voice Coil, September 2015.
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Patent Review: A New Electro Acoustic Drive System With Sensor from Fraunhofer
by James Croft

Patent Review: A New Electro Acoustic Drive System With Sensor from Fraunhofer

In this article, James Croft dives in an interesting loudspeaker patent (US20150146910A1), awarded May 28, 2015 to multiple inventors from the Fraunhofer-Gesellschaft Institute in Munich, Germany. The patent describes a diaphragm drive system with a conventional electromagnetic motor and corrective piezoelectric elements that drive the suspension from a sensor that detects the nonlinearity and provides the corrective signal. This article was originally published in Voice Coil, September 2015.
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Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - The Measurements
by Stuart Yaniger

Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - The Measurements

Oliver A. Masciarotte was looking for an amplifier that he could respect without emptying his bank account. Richard Schram offered to send the Parasound JC 5, his company’s largest stereo power amplifier for evaluation. Anticipating the fun of enjoying the pleasures of this John Curl design, Oliver accepted the challenge, and Stuart Yaniger tested the JC 5 to confirm the amplifier’s merits with actual measurements. This article was originally published in audioXpress, September 2021.
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Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - Traditional Goodness
by Oliver A.Masciarotte

Fresh From the Bench: Parasound Halo JC 5 Stereo Power Amplifier - Traditional Goodness

Oliver Masciarotte was looking for an amplifier that he could respect without emptying his bank account. Richard Schram offered to send the Parasound JC 5, his company’s largest stereo power amplifier for evaluation. Anticipating the fun of enjoying the pleasures of this John Curl design, Oliver accepted the challenge, and Stuart Yaniger tested the JC 5 to confirm the amplifier’s merits with actual measurements. This article was originally published in audioXpress, September 2021.
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Some Speaker Problems That Needed Solving
by Bruno Putzeys and Lars Risbo

Some Speaker Problems That Needed Solving

In this article for Voice Coil, the two co-founders of Purifi Audio share some details about the company's unique research with loudspeakers, and reveal their findings in looking for the roots of speaker nonlinearities and distortion mechanisms. A research effort that the authors believe deserves consideration from the industry, as a new set of standard parameters that should be included in datasheets. This article was originally published in Voice Coil, August 2021.
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Fresh From the Bench: Audio Precision APx517B Acoustic Audio Analyzer
by David Logvin

Fresh From the Bench: Audio Precision APx517B Acoustic Audio Analyzer

Primarily targeted at production test applications, the APx517B debuted at the end of 2020 and supplements AP's powerful product line of analyzers, which are considered the gold standard in audio measurement. In his review, David Logvin explores audio measurements with this fully integrated hardware, that combines multiple digital interface options all with accredited calibration. This article was originally published in audioXpress, August 2021.
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Patent Review: Desktop Audio Monitor System and Method
by James Croft

Patent Review: Desktop Audio Monitor System and Method

In this patents review, James Croft looks at one of the most interesting concepts for a “Desktop Audio Monitor System and Method.” US Patent 9036837, was granted in 2015 to James Tuomy (Framingham, MA), Barry Michael Kosherick (Hudson, MA), Laurie Wilk (Framingham, MA), and J. Richard Aylward (Ashland, MA). The concept was actually introduced to the market a year earlier, and made its big debut at the NAMM Show 2015, by Phasx Technologies. This article was originally published in Voice Coil, August 2015.
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Market Update 2021: True Wireless Earbuds Evolving Toward Hearables
by Joao Martins

Market Update 2021: True Wireless Earbuds Evolving Toward Hearables

There’s a lot happening in the true wireless stereo (TWS) category and this market update article intends to provide a quick overview of the state-of the-art technologies and platforms in the space, as well as some reference approaches in product design. This audioXpress Market Update addresses what is happening in this vibrant product category in 2021.
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