Get It in Motion with Voice Coil August 2025

In this issue, Jonathan Gerbet explains everything we need to know about the next-generation of Klippel's Fast Large Signal Identification (FLSI) measurement tool. And as scheduled, Mike Klasco prepared a valuable directory of Voice Coil Winders, plus a subdirectory with Converters, Lead Out Wire, and Magnetic Fluid suppliers. For this month's Test Bench, Vance Dickason characterizes the new 10NTLW2500 Pro Sound Tetracoil midbass woofer from Eighteen Sound, followed by the UMII12-22 subwoofer from Dayton Audio's new Ultimax II line.

Prolight+Sound 2019 was a reassuring show for all companies working with Eighteen Sound drivers. The company is now, together with Ciare, part of the B&C Speakers SpA Group of companies. At the Frankfurt show, Eighteen Sound and Ciare had their own separate booth (side by side with B&C), showing lots of new products in all areas of the portfolio. Of course, Eighteen Sound is renowned for its low frequency drivers, and during Prolight+Sound the company impressed with the new 18NTLW500 next generation high performance subwoofer using Tetracoil technology.

Targeting the most demanding sound reinforcement applications, particularly touring systems, Eighteen Sound continues to design better-performing low frequency solutions with reduced size and less weight. Already a recognized leader in low frequency designs, the Italian brand continues to extend its subwoofer range featuring Tetracoil technology, with the introduction of the 15TLW3000 Very Low Frequency 15” woofer, and the announcement of the new 21TNLW5000 21” Neodymium woofer.

The transducer under review this month is from the Italian pro sound company, Eighteen Sound. Designated a subwoofer, the 18TLW3000 is a high power handling woofer rated at 1,800 WRMS with substantial features, including what Eighteen Sound calls a “Tetracoil” dual winding and interleaved sandwich voice coil (ISV). This article was originally published in Voice Coil, December 2013.