Back EMF Phase Relationships in Moving-Coil Loudspeakers - Part 4

In this final article of the four-part series, Andy Lewis expands upon the Back EMF concepts hinted at in the previous three articles in this series. This article explores the Electrical and Newtonian filters and their intersections, observations on reactive parallel filters as pertains to Back EMF and energy losses. The theories can be applied to virtually all areas of loudspeaker design. This article was originally published in audioXpress, November 2018.

Audio Precision announced the release of their newest driver for National Instrument’s LabVIEW software, which enables easy access to APx515 as a data acquisition platform. Additionally, the driver enables control of the APx515 completely independent of the APx500 control software.

Usually we think of noise as a signal to be eliminated, or at least reduced, in any audio system. However, noise can be a very useful test signal because it is inherently broadband, which is faster and perhaps more accurate than spot or swept frequency testing. Article originally published by Voice Coil, December 2010

All-pass filters are perhaps one of the most overlooked and misunderstood tools for the general audio practitioner. Much has been written about their use to yield more linear phase response through the majority of a loudspeaker’s passband. They can also be used to optimize the directivity and magnitude response of a loudspeaker system. Perhaps we should first look at exactly what an all-pass filter is.

Ramping in volume production across all key customers, Skyworks Solutions recently introduced a new generation of highly advanced front-end solutions for 802.11 wireless audio applications. The semiconductor company confirms increasing demand from OEM’s, including industry leaders in the streaming music platforms such as Bose and Sonos.