In this edition, Vance Dickason writes about the range of DSP Active Line Level Crossovers available from Danville Signal. The advantages of active DSP crossovers are long recognized and a majority (about 90%) of today's professional audio loudspeakers and studio monitors are powered loudspeakers using also some kind of integrated DSP. Gradually the market is evolving also toward different forms of powered solutions for wireless speakers and even high-end home audio designs, benefiting from the latest Class-D amplifiers, which have gotten significantly better. Based in Minneapolis, MN, Danville Signal Processing has long been supplying high-performance DSP crossovers and DSP modules to the OEM market, and this edition of Voice Coil highlights the company's range of Snowbird, Greywolf, and the soon-to-be-released Bluebill DSP modules, all footprint compatible.For this edition's Spotlight, Joe Hayes (VP Engineering, Vastigo) writes about the DaS AuReality fully patented 3D loudspeaker technology, which results from a multi-year effort of Diffusion at Source (DaS) and elliptical soundfield speaker design approaches. DaS AuReality has evolved out of work known as “Acoustic3D” from an Australian-based company and is now being commercialized by Vastigo, Ltd. (Vastigo.com), headquartered in Singapore. Vastigo is offering licensees for the DaS AuReality technology in its many market application segments, which include virtually all speaker applications. The technology is backed up by a comprehensive multi-generation and geographical market patent folio. This article offers all the details into the unique approach followed by the development and multiple applications segments envisioned by the inventors. "The ability to easily and effectively eliminate the listening room acoustical specular reflections, creates an 'uncannily real listening environment,' where the performer’s every nuance becomes audible," Hayes describes.
This edition of Voice Coil also includes an unusual Focus article by Mike Klasco (Menlo Scientific), in which he attempts to find common denominators between multiple speaker-related technologies that can contribute to "smart speaker" design efforts. In "An Introduction to Smart Speakers for Speaker Engineers," Mike Klasco identifies many of the common challenges that these compact, portable, and highly sophisticated speaker designs entail, and proposes how multiple inventions, solutions and companies can help meet the identified goals. The article describes solutions from Dinaburg Technology, Premium Sound Solutions, Fibona Acoustics, Resonado Labs, Trulli, Mayht, Tectonic Audio Labs, Nuvoton, Syntiant, Native Voice, and Linkplay.
In this month's Test Bench, Vance Dickason decided to combine three new 25mm high-frequency transducers from BlieSMa into a single characterization: the BlieSMa T25S-6 Silk Dome, the BlieSMa T25B-6 Beryllium Dome, and the BlieSMa T25D-6 Diamond Dome. BlieSMa, which is located in Blieskastel, Germany, was founded in January 16, 2018 by Stanislav Malikov. Over the last 20 years, Malikov has worked at Ultrasound Technologies; at industry legend Morel as a QC manager and transducer engineer; and at Accuton, the well-known high-end driver OEM, as a production engineer for more than 8 years. For the last 3.5 years BlieSMa has been producing some very high-quality OEM high-frequency transducers and has now introduced four more 25mm domes to its catalog.
Three of the four transducers are being featured in this Test Bench article. All three tweeters appear to be built on the same platform, but optimized for each diaphragm material. In terms of features, all three share pretty much the same feature set, including a 25mm dome diaphragm (both the Beryllium and Diamond domes have a first break-up mode in the ultrasonic range), and extremely low moving mass for better transient response and higher output. All three feature a fully saturated neodymium motor with copper sleeve shorting ring, large pole vent, narrow, flush-mounted surround, a rear-mounted magnet system, with an underhung voice coil with a Titanium former, and aluminum rear chambers with wool damping material. Connections use flexible and lightweight tinsel leads from Denmark with gold-plated terminals.
The usual dose of Industry Watch updates address the latest updates from Klippel, Celestion, and the Audio & Loudspeaker Technologies International (ALTI) association.
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