At ALMA 2015, Tim Gladwin of Warkwyn Associates presented “Mitigating Enclosure Resonances by Mapping Vibration Patterns.” The presentation examined traditional methods, as well as new methods employing the the Klippel Scanning Laser Vibrometer for assessing and controlling panel resonance. Three real world case studies are included that illustrate the kinds of vibration problems speaker designers struggle with. Click here to view the presentation materials. If you would like more information on the presentation, Klippel equipment or Warkwyn’s services, please contact us.
At ALMA 2015 Dave Logan of Warkwyn Associates along with Wolfgang Klippel, Christian Bellman and Daniel Knobloch of Klippel GmbH presented “Holographic Measurement of the 3D Sound Field using Near-Field Scanning,” a seminar that explored the pros and cons of traditional loudspeaker measurement techniques and Klippel’s Near Field Scanner. Click here to view the presentation materials. If you would like more information on this presentation, the scanner itself, or Warkwyn’s complete range of design and measurement services please contact us.
The Evolution of Loudspeaker Measurement (or the futility of using 20th century tools to address 21st century needs) By Tim Gladwin Today’s hyper-competitive loudspeaker market puts product development teams under intense pressure to innovate and improve product performance while lowering development time and costs. And yet product developers are often saddled with mid-20th century tools that are expensive, slow and inaccurate. In this paper we will briefly review the history of loudspeaker measuring tools, their advantages and disadvantages, and compare them to a new measurement device from noted acoustic measurement pioneer Klippel GmbH. Klippel’s new Near Field Scanner (NFS) promises lower costs, fewer man-hours and greater accuracy than any other method. Anechoic chambers have been used to provide a controlled environment for loudspeaker measurement since the early 1930’s. They were developed to reduce the limitations of outdoor measurements: extraneous noise and weather. By 1946, Beranek and Sleeper had optimized wedge and chamber design (JASA 18-1 1946). Today’s anechoic chambers are essentially unchanged from Baranek & Sleeper’s time. At the time, the test signal was a slow swept sine wave from a heterodyne oscillator, often recorded directly to paper on a strip chart recorder. The ballistics of the pen and the…
The September 2014 issue of Sound + Vision magazine features a spectacular review of the Definitive Technology Mythos ST-L loudspeaker. Warkwyn Associates developed all of the transducers and passive crossovers in this exceptional speaker and was a major contributor to the overall system design. The author credits Klippel analysis tools throughout the article for many of the products’ innovative technologies. As more brands rely on Klippel for their designs and publicize its contributions, consumers will increasingly be looking for the Klippel mark. Will your products be among them? Sound + Vision Definitive Tech Mythos ST-L review