Patent Review: Loudspeaker Having a Passive Radiator US9426548B2

This article discusses a very interesting design and patent granted in August 2015 to Gary A. Rayner and James C. Larsen, as the inventors, on behalf of Treefrong Developments, from San Diego, CA. The patent abstract details a loudspeaker using one or more active drivers, with a passive radiator connected to each driver and dedicated processors and amplifier per channel - a slightly different approach to a familiar concept. This article was originally published in Voice Coil, November 2015.

November 2015 marks the beginning of Voice Coil’s 29th year as an information resource for the loudspeaker industry. So there’s definitely reason to celebrate and several good reasons to download the issue right now. Including a MEMS Microphone Status Update, Measurement Microphone directory, and Test Bench, which focuses on the UH205PW1 8” mid-bass driver from Motus.