All items tagged with passive radiator (55)

Patent Review: Loudspeaker Enclosure with a Sealed Acoustic Suspension Chamber

August 13, 2025 by James Croft

Patent Review: Loudspeaker Enclosure with a Sealed Acoustic Suspension Chamber

James Croft reviews a design, invented in Sweden, and patented in 2018, of a new approach to an area that has been extensively researched in an effort to improve low-frequency performance in speakers. The specific design under review describes a loudspeaker enclosure housing a sealed acoustic suspension chamber, where a driver and a passive acoustic diaphragm on opposite sides are combined with a first bandpass chamber connected to the sealed chamber by the passive unit in a curved structure.

ADAM Audio Unveils New D3V Compact Nearfield Monitoring System

October 18, 2024 by Joao Martins

ADAM Audio Unveils New D3V Compact Nearfield Monitoring System

Adam Audio has revealed what will be its most compact active monitor design, and also its most affordable. The new D3V is a compact nearfield monitoring system designed for songwriters, producers, and music enthusiasts that draws from the company’s origins, with its 1.5” D-ART AMT tweeter, and adds a 3.5” aluminum woofer plus dual-sided matching 3.5” passive radiators to extend the frequency response. Featuring a powerful DSP section for room compensation, the D3V also adds a USB-C input for direct DAW integration - no audio interface required.

Bose Introduces SoundLink Home Bluetooth Speaker

October 1, 2024 by Joao Martins

Bose Introduces SoundLink Home Bluetooth Speaker

Bose is rethinking the portable speaker category and redesigning its own iconic SoundLink Bluetooth speaker family. The new addition to Bose's consumer portfolio is the SoundLink Home Bluetooth Speaker, an innovative design that fills any room and offers great aesthetics. Compact yet powerful, the SoundLink Home Speaker is a sleek wireless design that alludes to early Japanese transistor radios, but offers all the features associated with smart speakers.

September 20, 2024 by Joao Martins

Peter Lyngdorf and Purifi Audio Announce New Radiant Acoustics Speaker Brand

There's a new Danish hifi speaker brand in the market, part of the expanding audio universe created by Peter Lyngdorf, the founder of HiFi Klubben, and co-founder of Purifi Audio. The project was inspired by Henrik Reinholdtsen, the CEO of Nordic Hi-Fi, a direct-to-consumer business that is also part of the HiFi Klubben universe. Radiant Acoustics is now on the market with the Clarity 6.2 passive speaker, using a 6.5" Purifi woofer and a new AMT tweeter, with a custom-designed waveguide, developed by Lars Risbo.

MartinLogan Unveils New and Improved Abyss Subwoofers

August 2, 2024 by Alfred Moody

MartinLogan Unveils New and Improved Abyss Subwoofers

For a company recognized for its electrostatic speakers, MartinLogan did very well when it decided to also offer subwoofers in 2001, creating a completely new growth category. In 2006, MartinLogan launched the Abyss series and took that business to another level. Now, the Kansas-based company relaunched the Abyss high-performance subwoofer range, adding advanced DSP, built-in wireless, advanced Anthem room correction, and easy-to-use app control.

Patent Review: Acoustic Passive Radiator Rocking Mode Reducing

June 12, 2024 by James Croft

Patent Review: Acoustic Passive Radiator Rocking Mode Reducing

With the increasing popularity of miniaturized systems, the application of the passive diaphragm radiator, as the acoustic mass component in a bass reflex enclosure, is becoming standard practice in the low-frequency portion of the system. And these systems have a few parameter demands that can exceed the capability of many conventional approaches to passive radiator design. In order to solve those challenges, including rocking modes, Bose proposed an effective design.

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.

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