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.

Brane Audio, an audio company from Austin, Texas, is introducing a new portable speaker at CES 2023 which the company says is able to generate expanded low frequency response. The Brane X is the first speaker in its class to include a subwoofer, producing much more bass than comparable portable speakers thanks to the company's new Repel-Attract Driver (R.A.D.) that uses a novel "magnetic negative spring" supported by an axial magnetic bearing system. Brane Audio is offering private demos of its new speaker during CES.