All items tagged with loudspeaker measurements (83)
Non-Linear Amplitude Modulation of Loudspeakers
February 12, 2025 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
February 5, 2025 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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Development & Design: Experimental and Theoretical Investigation of an Unusually Shaped Horn
December 18, 2024 by Joerg Panzer and Patrick Macey

Development & Design: Experimental and Theoretical Investigation of an Unusually Shaped Horn

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.
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Sharing the Knowledge. audioXpress October 2024 Is Now Available!
September 12, 2024 by audioXpress Staff

Sharing the Knowledge. audioXpress October 2024 Is Now Available!

Read the extended Show Report of the 5th International AES Conference on Automotive Audio. Santiago Rayes (GRAS Acoustics) explains the latest advances in Measurement Microphones for Automotive Testing. Reinhold Lutz writes about Eliminating Speaker Doppler Distortion, René Christensen shares an exercise of Double Bass Arrays, and Joerg Panzer (R&D Team) and Patrick Macey (PACSYS) share their Experimental and Theoretical Investigation of an Unusually Shaped Horn. Jan Didden reviews Bob Cordell’s latest book, “Designing Audio Circuits and Systems”.
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SPL Graph Data: Let’s Get Back to a Level Playing Field
July 24, 2024 by Tom James

SPL Graph Data: Let’s Get Back to a Level Playing Field

This excellent thought piece by loudspeaker industry veteran Tom James, addresses the often disregarded topic of speaker measurements and the corresponding variables of SPL Graph Data. In his short essay James explores the impact of ignoring or intentionally manipulating the rules established in the "Scales and Sizes for Plotting Frequency Characteristics and Polar Diagrams," defined in the IEC-602632 standard, originally from 1982 and updated in 2020.
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MISCO Celebrates 75 Years of Speaker Manufacturing and Audio Innovation
July 9, 2024 by audioXpress Staff

MISCO Celebrates 75 Years of Speaker Manufacturing and Audio Innovation

MISCO Speaker Company is celebrating its 75th anniversary. Founded in 1949 as Minneapolis Speaker Company (MISCO) by World War II veteran, Cliff Digre and his wife, Bernice, MISCO has remained a family owned business, now helmed by the founders’ son, Dan Digre, who has driven the company forward through decades of technological advancements and market expansion. MISCO stands as a US-based, pioneering force in the audio industry, manufacturing speakers and audio systems for OEM customers across the globe.
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Loudspeaker Knowledge and Innovation in Voice Coil April 2024
March 28, 2024 by audioXpress Staff

Loudspeaker Knowledge and Innovation in Voice Coil April 2024

In Voice Coil April 2024, Tom James reminds us about the importance of SPL Graph Data, and Mike Klasco revisits the fundamentals of speaker lead-out wire. As scheduled, there's an updated directory of Speaker Cable and Connector Vendors. James Croft explores a patent detailing a filter that may increase and extend the bass frequency response of a speaker. And for this month's Test Bench, Vance Dickason characterizes the Neotera Ultraflat UF 295 CBS 10" Subwoofer, followed by the SEAS W16NX005 5.25" Midbass Woofer with a metamodal TPCD diaphragm.
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The IEC 60263:2020 Standard - Is a Picture Worth a Thousand Words?
February 1, 2024 by Geoff Hill

The IEC 60263:2020 Standard - Is a Picture Worth a Thousand Words?

With the proliferation of different electronic formats and screen grabs, aspect ratios, scales, and sizes for plotting frequency characteristics and polar diagrams, presenting audio measurement results in a clear and informative way is an even greater problem today than in the past! Geoff Hill explains what there is to know about the IEC 60263:2020 updated standard: Rules for scales and sizes for plotting frequency characteristics and polar diagrams... and what could go wrong.
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Redrock Acoustics Relaunches Loudspeaker Testing Services
November 20, 2023 by audioXpress Staff

Redrock Acoustics Relaunches Loudspeaker Testing Services

Redrock Acoustics, the company founded by Patrick Turnmire, announced the launch of a new website that also signals the return of the company to offering loudspeaker testing services. Renowned for offering engineering and design services, Redrock Acoustics is again opening access to services that include Klippel testing and transducer analysis. Visitors to the new website will find information about all services, and the SpeaD transducer development software, as well as other design tools.
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The AudioChiemgau ModeCompensator: A Quick Basic Test
November 15, 2023 by Rens Tellers

The AudioChiemgau ModeCompensator: A Quick Basic Test

The principles applied by Dr. Reinhold Lutz's for precise measurement of the sound pressure frequency response in the presence of room modes, are available in its AudioChiemgau Mode-Compensator solution. Jan Didden and Rens Tellers did a basic functional test to find out how well they could make it work and they were pleasantly surprised with the results. This article was originally published in audioXpress, October 2023.
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