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.
Authors:
Rousseau, Martial; Vanderkooy, John
Affiliations:
B&W Loudspeakers Ltd; University of Waterloo(See document for exact affiliation information.)
AES Convention:
118 (May 2005)
Paper Number:
6524
Publication Date:
May 1, 2005
Subject:
Loudspeakers & Microphones
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.