Originally Posted by Bill Fitzmaurice
This is but one of many. Looking in the wrong places you have been.
I break in every driver I use in design prototypes. They always measure differently after break in, that's why I break in every single one.
Thanks for the links, Bill & simp1yamazn. Yes, there are measurable parameters that change with break-in, so claiming that nothing changes during break-in would be incorrect. What I had in mind however was the OP's question about the need to delay taking Audyssey measurements until after a suitable break-in period has occurred. Audyssey sets gains, distances, and EQ's the frequency response. The question that remains in my mind is which of those values would be significantly inaccurate if Audyssey measurements were taken after 1 hour of use versus the 40 hour point?
The Audioholics analysis provided by simp1yamazn seems to corroborate the belief that the OP needn't wait for a break-in period before running the Audyssey setup:
"Clearly, the differences in amplitude response between the pre- & post-break in systems are negligible."
"it's clear the volume of air confined within the sealed cabinet of the enclosed box loudspeaker system moderates any measurable and/or audible changes that might arise as a consequence of driver compliance changes."
"it's reasonable to conclude that suspension compliance changes arising as a consequence of initial driver burn in has little effect on the performance of a loudspeaker system."
The Audioholics test also includes pre & post break-in frequency response charts showing negligible differences, so I remain skeptical of the need to wait...