Loudspeaker Knowledge and Innovation in Voice Coil April 2024

In Voice Coil April 2024, Tom James reminds us about the importance of SPL Graph Data, and Mike Klasco revisits the fundamentals of speaker lead-out wire. As scheduled, there's an updated directory of Speaker Cable and Connector Vendors. James Croft explores a patent detailing a filter that may increase and extend the bass frequency response of a speaker. And for this month's Test Bench, Vance Dickason characterizes the Neotera Ultraflat UF 295 CBS 10" Subwoofer, followed by the SEAS W16NX005 5.25" Midbass Woofer with a metamodal TPCD diaphragm.

Researchers at the Massachusetts Institute of Technology (MIT) have developed an ultra-thin loudspeaker that can turn any rigid surface into an active audio source. To demonstrate the concept, MIT engineers have developed a paper-thin loudspeaker, which was now presented in public, pitching a straightforward fabrication process that could be introduced to enable the flexible, thin-film solution to be produced at scale.

Eastech has recently released five new drivers in its Punktkilde brand catalog. Punktkilde is Danish for "point source," which intends to highlight products designed by Danish high-end driver OEM Scan-Speak. The newly released drivers include the AUGWL0030-JN02, a 12" 8Ω woofer with a carbon pulp diaphragm; the 2" full-range AUGFL0005-JN08 compact design, and the 2.25” ultra-thin AUGWL0006-JN01, 3" AUGWL0008-JN07, and 3.5" AUGWL0009-JN04 radial magnet woofers.