Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
Accurate Calculation of Radiation and Diffraction from Loudspeaker Enclosures at Low Frequency - June 2013
New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
Visco-elastic Aspects of Loudspeaker Drivers
Damping materials used in drivers often give rise to changes in resonance characteristics that can affect the acoustic properties. We study with several techniques the properties of the viscoelastic materials commonly applied to the surround or spider. Measurements are taken of the resonance characteristics with increasing temperature, which show a significant reduction of the suspension stiffness. Exercising the driver reduces the stiffness as well, and this is partly due to a combination of mechanical and thermal effects. An attempt is made to characterize the changes in terms of temperature and the history of the mechanical motion. Differential scanning calorimetry (DSC) measurements are made of some samples in an attempt to understand the underlying physical behaviour.
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