Test Bench: The UF295FAS Thin-Profile Dipole 10" Woofer from Neotera

This new 10" thin-profile woofer comes from Neotera, a new company headquartered in Sweden, founded by a diverse group of loudspeaker/electronic design veterans. Maurizio Servadio is the engineer who invented the Neotera Ultraflat technology and is based in Italy where the UF295FAS is manufactured. This thin-profile woofer with a depth of 2.6" and with a low-frequency response down to 29Hz, is specifically designed for dipole system applications. This article was originally published in Voice Coil, November 2023.

In the first issue of Voice Coil for 2024, Patrick Turnmire writes about "Diagnosing Speaker Design Issues Using the Klippel Distortion Analyzer." James Croft reviews a Devialet patent. And in Test Bench, Vance Dickason characterizes the new DE350-8 Ultra-Compact 1" Compression Driver from B&C Speakers, and the new LM10n Wide Band Ribbon Transducer from Radian Audio Engineering. This issue also features an updated directory of 2024 Earphone and Headphone Manufacturers and Parts Suppliers.

Neotera Audio, which has manufacturing in Italy and engineering in Sweden, has recently released two rather interesting thin-profile 10" woofers, the UF295CBS, and the UF295FAS. Both woofers have a voice coil and motor structure located around the rim of the cone assembly, and both use and front and rear facing NBR surrounds for compliance. The UF295CBS was designed for small closed box subwoofer applications, while the UF295FAS is a a pure dipole woofer with a Fiberglass/Rohacell dome suspended directly on the voice coil.

For the speaker builders, Perry Marshall details everything there is to know about his beautiful Live-Edge Dipoles project. A design that was inspired by two slabs of birch the author brought home, allowing to finally bring to fruition his idea to build these dipoles. Marshall reveals all the specifics of the driver choices, radiation pattern, and crossovers, while explaining the effects of the obtained radiation pattern and how the speakers behave in practice. This article was originally published in audioXpress, January 2021.

In the October 2023 issue of audioXpress, Jan Didden visits Dutch & Dutch, Reinhold Lutz shares a practical way to measure loudspeakers in any room with his AudioChiemgau Mode-Compensator, which is tested by Rens Tellers. We have two DIY open baffle projects from Perry Marshall and Charlie Laub, Richard Honeycutt writes about the Western Electric 91E, and Ethan Winer shares his Popping P Filter circuit. In the Sound Control column, Honeycutt explores Passive Variable Acoustics, and Chuck Hansen concludes his article series on Power Transformers. audioXpress October 2023 is now available in print, digital, and online.

James Croft looks at an interesting new patent covering a “Compact Stand-Alone Stereo Loudspeaker” by inventor Jes Mosgaard from Libratone A/S (Denmark). This patent submitted in 2010, was granted in 2013, and describes a compact and portable stereo loudspeaker system that is capable of providing a spacious sound field using an internal stereo pair of loudspeakers arranged in a dipole configuration. This article was originally published in Voice Coil, February 2015.

Celebrating 50 years of The Audio Amateur - the publishing company that started it all for us - and 20 years of audioXpress, we begin 2021 with a great - and expanded - edition. We discuss market and technology trends in Speakers and Transducers, a new MEMS transducer topology for wireless earbuds, and the latest innovations in haptic drivers and transducers. Perry Marshall details his unique dipoles speaker project, and renowned tube expert Menno van der Veen explains all the secrets of the latest Vanderveen Trans-SE10 amplifier. Now available in print and digital