2019 Midwest Audiofest Speaker Design Competition

One of the most important audio events for the speaker building and DIY audio communities, the Midwest Audiofest (MWAF) is held in Springboro, OH, in July every year. Sponsored by an impressive group of vendors and hosted by Parts Express, this event combines several activities including a huge tent sale at Parts Express. For Thomas Perazella the highlight of the event is the Speaker Design Competition, for which he was again one of the competition judges. This article was originally published in audioXpress, October 2019.

Anyone who is serious about designing a loudspeaker using dynamic drivers is either familiar with, or has used, Thiele/Small parameters, generally accepted as ways to predict driver behavior in different enclosures. But there are other measurement methods we can use to determine and quantify nonlinearities: the DUMAX system, produced by DLC Design, and the Klippel Analyzer System by Klippel GmbH. This article was originally published in audioXpress, March 2003.

In January and February 2001, audioXPress included a project from Thomas Perazella, describing in detail the design and construction of a speaker using the Bohlender Graebener RD-75 planar magnetic driver. This is the second part of the project, detailing the final part of the speaker construction, measurements and listening trials.

In January 2001, the first audioXPress magazine issue (Vol. 32 No.1) included this project from Thomas Perazella. Published in two parts, the articles described in detail the design and construction of a speaker using the Bohlender Graebener RD-75 planar magnetic driver, including references to previous experiments with dipole baffles. This is the first part of the project.