Patent Review: Dual Coil Electrodynamic Transducer with Channels for Voice Coil Cooling

James Croft reviews a published design submitted on behalf of Harman International Industries on January 2017. The design details an important approach to solving the everlasting problems of heat generation that limits the power handling capacity and the distortion-free acoustic output capability of loudspeakers, as well as their efficiency as electroacoustical transducers. This article was originally published in Voice Coil, September 2018.​​​​​​​

CODA Audio had a busy demo room all through the InfoComm 2019, with continuous presentations of the many sound reinforcement solutions from the German brand for the professional audio market, and particularly for the US market. The company reported an excellent reception for the patented APS technology, implemented in CODA's new N-APS loudspeaker system, which was the main focus for the Orlando show, reinforced by the N-SUB compact subwoofer.