Quote:
anidabi wrote:
 This is interesting. I didn't think about the voice coil heating at all, but like jakeman said, the first thing that came to my mind was the driver surrounds. How does that affect to the results? Especially with LMS drivers wich have rubber surrounds. Maybe the noise at high output was partially from the surround, because of the coldness? Higher distortion levels or something like that?  |
10 C isn't cold enough to have any real difference. Below 0 C would be a different case though but no one ever tests at those conditions.
The tall profile surround makes the cavitation noise even at normal room temperatures at high excursion (over ~25-30mm one way; think about the SPL at this point!
). But it's not as bad as people may think, it's just shows up in measurements because the LMS has such ultra low "other" distortion. Other drivers have so much other distortion that this kind of surround distortion doesn't present itself.