All items tagged with passive radiator (55)

Patent Review: Air Motion Transformer Passive Radiator for Loudspeaker

January 10, 2024 by James Croft

Patent Review: Air Motion Transformer Passive Radiator for Loudspeaker

In the August 2018 issue of Voice Coil, James Croft combined the review of two important independent patents, having in common the fact that they try to address the shortcomings of the work of Dr. Oskar Heil with his Air Motion Transformer (AMT) woofer system. Following a review of a Tymphany patent, Croft reviewed a related patent for an Air Motion Transformer Passive Radiator, invented by and awarded to Eugene Julius Christensen (Aspen, CO).

Tectonic Audio Labs to Showcase Exciting New Drivers and Reference Designs at CES 2024

December 21, 2023 by Joao Martins

Tectonic Audio Labs to Showcase Exciting New Drivers and Reference Designs at CES 2024

For CES 2024, Tectonic promises exciting demonstrations of its latest OEM speaker designs and cutting edge engineering services capabilities. Confirmed for the Las Vegas show are two new Tectonic drivers: Basalt, a 3:1 aspect ratio Mid-HF Balanced Mode Radiator (BMR) with exceptional directivity over both long and short axes; and Andesite, a low profile Symmetric Drive Woofer for very slim products. Two reference designs will showcase the possibilities for ultra-slim TVs and soundbars.

Klipsch Debuts Premium Portable Bluetooth Speakers with Broadcast Mode

October 30, 2023 by Joao Martins

Klipsch Debuts Premium Portable Bluetooth Speakers with Broadcast Mode

Klipsch has announced the debut of the Klipsch Music City Series of portable Bluetooth 5.3 speakers. With three models named Austin, Nashville, and Detroit, the new speaker range was inspired by the legendary artists and musical genres of iconic American music cities. Each speaker offers a unique set of features and combination of drivers, surpassing expectations regarding bass, and allowing a party mode with multiple speakers playing from the source.

Patent Review: Simply A Speaker by Harman

May 25, 2023 by James Croft

Patent Review: Simply A Speaker by Harman

This review looks at a speaker patent, awarded to inventor Shengbo Li from Guangdong, China, on behalf of Harman International. The abstract from that patent details a speaker including one or multiple transducers, an enclosure, and a suspension mounted on the enclosure, wherein the suspension and the enclosure are configured such that the enclosure is capable of vibrating as a result of operation of the transducer so as to produce audible sound. You read it right, the enclosure is also a passive radiator!

Patent Review: Passive Radiator with Dynamically Adjustable Resonant Frequency

March 22, 2023 by James Croft

Patent Review: Passive Radiator with Dynamically Adjustable Resonant Frequency

This review addresses an important patent awarded to Joseph F. Pinkerton (Austin, TX), on behalf of Clean Energy Labs, LLC. The patent describes an audio speaker having one or more passive radiators, and more specifically, an audio speaker having a passive radiator with dynamically adjustable resonant frequency. Croft reviews the patent and compares it with previous attempts to achieve this useful development, with significant potential if its full capability is realized.

Patent Review: Passive Radiator Structure

March 15, 2023 by James Croft

Patent Review: Passive Radiator Structure

This article analyzes a patent awarded in March 2017 to Yeh-Feng Chou (Taiwan), on behalf of Meiloon Industrial Co., Ltd., of a new Passive Radiator Structure, which adds some desirable attributes and improved performance. As the abstract details, the passive radiator structure includes a surround suspension, a frame, and a web-like spider having a plurality of suspension arms integrally extended to between the diaphragm and the frame, which together minimize sound distortion, increase compliance and upgrade efficiency.

Creative Announces Stage SE Under-Monitor Soundbar with Bluetooth 5.3 and USB Digital Audio

March 14, 2023 by Alfred Moody

Creative Announces Stage SE Under-Monitor Soundbar with Bluetooth 5.3 and USB Digital Audio

Soundbars have originally conquered the living room to compensate for the poor sound in very thin TVs, and evolved in meeting rooms by gaining microphones and conferencing features. At the same time, under-monitor soundbars are gaining popularity for both gaming and working from home. Creative Technology announced the release of Creative Stage SE, the fourth and smallest under-monitor soundbar in this series, designed to amp up the user’s desktop audio experience.

CODA Audio Introduces 70mm Deep SPACE Loudspeaker Panels

February 1, 2023 by Joao Martins

CODA Audio Introduces 70mm Deep SPACE Loudspeaker Panels

In what promised to be one of the most exciting launches at ISE 2023, iconic electronic musician and composer, Jean-Michel Jarre, and contemporary French artist Eric Decastro have teamed up with German-based CODA Audio to unveil the new SPACE by CODA system concept. As the company describes it, "Art & Music Meets Technology." The really interesting part of the integrated concept is the new 70mm deep, SPACE Panels, which can offer sound quality and performance that rival conventional PA cabinets.

Patent Review: Vertically and Horizontally Balanced Subwoofer

January 4, 2023 by James Croft

Patent Review: Vertically and Horizontally Balanced Subwoofer

The patent reviewed here was granted to inventors Robert G. Johnston (Amprior Ontario, CA), and Sanford M.Gross (Owings Mills, MD), respectively the head of engineering of GoldenEar Technology, and one of its co-founders. The patent describes a subwoofer with two drivers on each side plus one passive radiator facing up and one passive radiator facing down. The passive radiator facing down effectively couples acoustic energy at very low frequencies into the floor.

SoundTube Releases Surface Mount Subwoofer With Versatile Mounting Options

July 8, 2022 by Alfred Moody

SoundTube Releases Surface Mount Subwoofer With Versatile Mounting Options

SoundTube, an MSE Audio brand and creator of the original Pendant Speaker, announced the release of the SM1001 Surface-Mount Subwoofer, a versatile 10” subwoofer that uses a downward-firing passive radiator and is ideal for rapid installation in retail environments and restaurants. The new subwoofer design comes with surface mount and corner mount brackets, allowing the cabinet to stay detached from the floor, or even positioned from a ceiling corner.

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