All items tagged with passive radiator (49)

Voice Coil Patent Review: Controlled Passive Radiator

March 27, 2024 by James Croft

Voice Coil Patent Review: Controlled Passive Radiator

James Croft has fun reviewing a Controlled Passive Radiator patent awarded to inventor Tony Doy, on behalf of Sonos (Santa Barbara, CA.) The patent details multiple techniques to control a passive radiator, including a device buffering successive samples of audio content and predictive techniques on active designs. With this extensive review, Voice Coil readers will gain a valuable perspective on key possible innovation areas. This article was originally published in Voice Coil, October 2018.

Bass Reflex Performance Envelope - Part 3: A Practical Example

March 20, 2024 by Gary Gesellchen

Bass Reflex Performance Envelope - Part 3: A Practical Example

In this article, Gary Gesellchen (Vanatoo) completes his Bass Reflex Performance Envelope exploration. After concluding the main analysis portion of the article determining his novel approach to estimating the performance envelope available from bass reflex loudspeakers, Part 3 shows an example to see how his calculations all work together, and addresses some practical considerations. This article was originally published in audioXpress, September 2023.

Bass Reflex Performance Envelope - Part 2: System Analysis

March 13, 2024 by Gary Gesellchen

Bass Reflex Performance Envelope - Part 2: System Analysis

This Bass Reflex Performance Envelope article series describes a novel approach to estimating the performance envelope available from ported loudspeakers. Part 2 expands on the system analysis, showing how driver and port sizes determine how loud and how low a system will play, and how that relates to generally available drivers. This article was originally published in audioXpress, August 2023.

Bass Reflex Performance Envelope - Part 1: The Foundation

March 6, 2024 by Gary Gesellchen

Bass Reflex Performance Envelope - Part 1: The Foundation

Targeting speaker designers/builders, Gary Gesellchen (Vanatoo) wrote a sequence of three articles discussing Bass Reflex Performance. Essentially, this series takes a novel approach to estimating the performance envelope available from ported loudspeakers, considering port and driver sizes and multiple applicable parameters, and comparison with the performance from a passive radiator. This article was originally published in audioXpress, July 2023.

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.

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