Patent Review: Double Coil Speaker

This article discusses a patent originally claimed in 2013 on a Double Coil Speaker design, which was granted in 2017 to Friedrich Reining (Vienna, Austria), on behalf of Sound Solutions International. The abstract from the patent details an audio system comprising an electro-acoustic transducer having two stacked voice coils mechanically linked to a membrane. James Croft discusses multiple approaches in similar concepts, and notes that the current state of technology might finally create a way to explore it in commercial products. This article was originally published in Voice Coil, March 2018.

In this month's Test Bench, Vance Dickason examines a new 1" PEEK diaphragm compression driver from Precision Devices, the PD.CD1N. This is a unique design in Precision Devices' UL portfolio, using a PEEK diaphragm/surround material, which also incorporates a three-slot optimized phase plug design and a 44 mm (1.73”) diameter voice coil wound with copper-clad aluminum wire on a Kapton former. This article was published in Voice Coil, March 2018.

For the Test & Measurement Focus published in audioXpress March 2018, two of our authors tackled IK Multimedia’s ARC 2.5 room correction system. In this article Stuart Yaniger tested the new MEMS measurement microphone available with IK Multimedia’s ARC 2.5 System. The microphone is built around an omni-directional, high precision MEMS capsule to ensure maximum response accuracy and stability over time. This article was originally published in audioXpress, March 2018

For the Test & Measurement Focus published in audioXpress March 2018, two of our authors tackled IK Multimedia’s ARC 2.5 room correction system. Ron Tipton investigated IK Multimedia’s claims that the new ARC 2.5 improves the audio monitoring accuracy of speakers in any studio or listening room, while Stuart Yaniger tested the new MEMS measurement microphone available with IK Multimedia’s ARC 2.5 System. In this section of the review, Ron Tipton looks in-depth at how to make the best use of the acoustic room correction possibilities of the ARC System.

Brent Butterworth reviews the new RA040X Ear Simulators from G.R.A.S. Sound & Vibration. Measuring headphone response at frequencies above-10 kHz has been an imprecise, non-standardized process. The new RA040X ear simulator represents part of an effort by G.R.A.S. Sound & Vibration to update headphone measurement equipment to suit the needs of today’s headphone industry, and make the measurements more meaningful. This article was originally published in audioXpress, March 2018.

This month, in Voice Coil, read our AISE 2018 Report, Christopher Struck discusses "Efficiency Bandwidth Product for Loudspeaker Drivers," and James Croft reviews a patent originally claimed in 2013 on a Double Coil Speaker design, now granted to Friedrich Reining (Vienna, Austria), on behalf of Sound Solutions International from China. In this month's Test Bench, Dickason examines two 1" compression drivers: a new PEEK diaphragm compression driver from Precision Devices, the PD.CD1N, and the Peerless by Tymphany DFM-2544R00-08. Download your copy now.

The March 2018 edition of audioXpress explores the latest advancements on Test and Measurement solutions and technologies. In this issue, we review G.R.A.S. Sound & Vibration's new RA040X ear simulators, and the IK Multimedia ARC 2.5 room correction system, with its included MEMS-based measurement microphone. We also discuss Measurement Microphones and Measurements for Smart Speakers, and conduct an interview Steve Temme, President of Listen, Inc. Gary Galo and Chuck Hansen pay tribute to the life and accomplishments of Victor Campos (1933-2017), and there is much more in this edition you don't want to miss!