Voice Coil continues to be essential reading for all loudspeaker industry professionals. The May 2018 edition highlights loudspeaker-related sessions that will take place at the upcoming 144th Audio Engineering Society International Convention taking place in Milan, Italy, May 23-26. Take note of the essential papers and tutorials being presented at this year’s convention.And this edition also includes an overview of the ARTA Audio Measurement and Analysis Software by Vance Dickason, recently updated to version 1.9.1. ARTA has been on the market since February 2006, and has been evolving and improving for the last 12 years. Produced by ARTALABS (www.artalabs.hr) located in Croatia, this Fast Fourier Transform (FFT) software analyzer is probably the gold standard for cost-effective measurement software packages ($98 for a single user license, and $185 a for multiple user license).
In this month's Acoustic Patents, James Croft (Croft Acoustical) discusses a recently published Radial Acoustic Speaker patented by Curtis Graber (Woodburn, IN). This patent describes a radial acoustic speaker assembly including a transducer and a plurality of segmented spiral horns acoustically coupled to the transducer, each with its acoustical path. As Croft discusses, this type of design is used in horizontally omnidirectional loudspeaker systems and has been tested in several different (unsuccessful) iterations. This new patent by prolific audio inventor, Curtis Graber, uses a new multi-spiral waveguide structure driven by a single transducer and has clear advantages over prior art.
For this month's Test Bench, Dickason characterizes two new 1” exit pro sound compression drivers from two well-established brands. The first is the CDX1-1742 from legendary UK Pro Sound OEM manufacturer Celestion. This driver joins the CDX family of ferrite motor compression drivers, now 15 models in total, and is designed for use with 1” throat horns, featuring a FEA-optimized ferrite magnet motor structure, and a proprietary next-generation “Sound Castle” soft diaphragm clamping assembly that reduces diaphragm mechanical stress and distortion. For this Test Bench, Celestion supplied the H1-9040P horn, with a 90° × 40° coverage pattern.
The second compression driver comes from Italian OEM manufacturer B&C Speakers and is the DE360-8, the latest addition to company's extensive 18 model ferrite and neodymium motor 1” exit compression drivers. This particular compression driver is one of several lightweight and compact neodymium motor compression drivers, designed for use with 1” throat horns, and featuring a nominal 35 W rated power handling (70 W continuous), a 1.8 kHz recommended crossover frequency, and 2.83 V/1 m 110 dB sensitivity. B&C Speakers supplied the ME20 horn for use with the DE360-8, which has a 90° × 60° coverage pattern.
In this month's Industry Watch, Dickason honors the memory of Joseph John Stupak, Jr. (1937-2018), the founder of magnetizing equipment Oersted Technology, who passed away on January 9, 2018.Among many news and updates, including a summary of Eminence latest drivers, and new measurement microphones from Audio Precision, this edition also discusses the latest SoundCheck 16 update from Listen, Inc., which Dickason is already applying in Test Bench and considers a “must-have” update, especially for the new real-time distortion analyzer and frequency counter.
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