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.

SVS, a name that everyone immediately identifies with powerful subwoofers, launched its new flagship 17-Ultra R|Evolution subwoofer series. Previewed at CEDIA 2024 in Denver, the two new 17-Ultra subwoofer designs represent a ground-up design approach for the Ohio-based audio brand, including a custom 17" high-excursion woofer with dual voice coil windings, a digital processing stage, and full room correction optimization through a smartphone app.

Audio-Technica launched its AT-ART20 Dual Moving Coil Stereo Cartridge, the latest in the company's ART Series of high-end phono cartridges. The AT-ART20 utilizes Audio-Technica’s magnetic-core design to achieve "superlative" vinyl playback performance with "extraordinary musical realism," as the company describes. The new AT-ART20 cartridge (SRP: US$2,900) also has a striking, distinctive contoured appearance.

Since their introduction more than 30 years ago Audio-Technica’s OC9 Series moving coil phono cartridges have been acclaimed by vinyl listeners and reviewers worldwide for their precise construction, exceptional sound quality and musical transparency. At the High End 2019 show in Munich, Germany, Audio-Technica introduced its AT-OC9X Series, the fourth generation of this legendary range of cartridges.