The influence of ambient temperature has a great effect on the suspension of the loudspeakers tested. The basic influence of ambient temperature on the test loudspeakers is a stiffening of suspension as ambient temperature is reduced from room temperature and a reduction of stiffness as temperature is increased. At very low temperatures the suspension stiffness is diminished with exercise until it reaches an equilibrium dominated by the ambient temperature. As the ambient temperature is increased, the suspension will soften. In the samples tested, at high ambient temperature around +40 deg C, the displacement potential exceeds that the nominal room temperature potential by ~50 % whiIe the resonance frequency has diminished by ~50 %. Sample 1 was seen to have a maximum excursion limit at elevated temperatures while sample 2 did not. Under certain circumstances sample 2 may have its voice coil bottom. Automotive sound system active equalization circuits typically would increase low frequency power as road noise increases. Without regard for ambient temperature influences on subwoofers the increased power may press the loudspeaker beyond its potential for acceptable quality .
Ambient temperature influences on OEM automotive loudspeakers
2002
10 Seiten, 22 Bilder, 3 Tabellen, 14 Quellen
Conference paper
English
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