Patent Review: Loudspeaker With a Wave Guide

This patent review looks at a “Loudspeaker with a Wave Guide” (Patent Number: US20140369543) by inventors Jussi Vaisanen and Ilpo Martikainen from Finish company Genelec. This patent relates to the Genelec 8351 Acoustically Coaxial Smart Active Monitor (SAM) monitor, originally launched in 2016. Later in 2017, Genelec expanded the concept into a complete series of Coaxial Active Monitors, “The Ones”. This article was originally published in Voice Coil, February 2015.

James Croft looks at an interesting new patent covering a “Compact Stand-Alone Stereo Loudspeaker” by inventor Jes Mosgaard from Libratone A/S (Denmark). This patent submitted in 2010, was granted in 2013, and describes a compact and portable stereo loudspeaker system that is capable of providing a spacious sound field using an internal stereo pair of loudspeakers arranged in a dipole configuration. This article was originally published in Voice Coil, February 2015.

In a nod to the Maker Movement, this project uses a common open-source microcontroller module, the Arduino, to build an automatic power controller for a tube power amplifier. The resulting controller is very simple — a $25 Arduino module, a couple of dual op-amps, a few other components, and a 5-VDC power supply plus some opto-isolated switches. This article was originally published in audioXpress, February 2015.

From mobile audio to wireless speakers and headphones, from immersive experiences to high resolution audio, there’s never been so much excitement for new technologies and integration. Crowdfunding platforms are helping promote new concepts that companies would normally never consider promoting for themselves (for multiple reasons).

The February 2015 edition of Voice Coil is already available and features our annual Loudspeaker Cone Vendor Survey 2015. James Croft’s Acoustic Patents reviews recent inventions from Libratone (Denmark) and Genelec (Finland). Vance Dickason’s Test Bench focuses on a 6.5” pro sound midrange driver, from PRV Audio Brazil and the reissue of the famous G12H “GreenBack” 12” guitar speaker by Celestion. Mike Klasco writes about the Endumax cone material by Teijin Aramid.

audioXpress February features an eclectic mix of articles touching on radically different audio technologies, from classic tube microphones to the most advanced audio processing software available. Don’t miss our reviews of Blue Microphones’ Mo-Fi Active Headphones and Native Instruments' Molekular. Headphones, wireless audio and how to use an Arduino microcontroller to build an automatic power controller for a tube power amplifier.