Quote:
Originally Posted by Stumbo  |
Interesting read.
But, I don't understand why the author did some of the tests e.g. temperature rise in relation to the off-axis response. I don't see any relation between off-axis response behavior and temperature rise. The deviation between on-axis and off-axis response is the same during temperature rise. If the on-axis response changes during heat up of the voice coil the change will be the same off-axis. It's the cone size, shape and it's internal damping that are responsible for the differences between on-axis and off-axis response. If there are differences caused by temperature change in the voice-coil they would be very, very tiny and so be non-relevant.
The only thing I can think of is that the increased heat in the voice coil transfers to the cone. This effects the inner structure of the conematerial and the suspension. This could change the internal damping characteristics.
More important is the change of impedance related to the frequency. Power compression.
Btw. I did not read the whole paper, so maybe I missed something.
