Test Bench: BDNC’s BGF-46166-18-4-003 Glass-Composite Flat Diaphragm Woofer

This article characterizes a cutting-edge product from BDNC, a patented “race track” shaped driver, and the first of its kind to use a glass diaphragm composite made up of two layers of “Schott AS87 Glass” with an internal layer of viscoelastomic damping material and aluminum alloy foil. The motor structure uses two neodymium bar magnets driving a two-layer race track-shaped voice coil wound with round copper wire on an aluminum former. This article was originally published in Voice Coil, June 2021.

BDNC Holding Ltd is now in production of its highly advanced flat glass-composite diaphragm woofer. Available through Digikey under the brand STAPEZ, this new innovative drivers use ultra-thin tempered glass as the diaphragm, combined in a low-profile woofer able to produce extended bass response. At present, the smallest size is 80 mm × 20 mm × 7.2 mm but BDNC is also working on smaller models and already launched a 40mm headphone driver using the glass-composite technology.

Voice Coil is gearing up for another exciting edition of the NAMM Show in Anaheim, CA, and this January 2018 edition features one of our most exciting Voice Coil directories, focusing on recent announcements about Headphone Measurement solutions. James Croft discusses a patent for an innovative flat speaker concept from Pioneer, while Vance Dickason characterizes a new 12” coaxial pro audio design from B&C Speakers. Download your Voice Coil now!