Re: Driver Break in - Fact or Fiction?
Vance Dickason's explanation is that while the speaker's suspension changes during break-in, parametric shifts that would affect a speaker design are rather small. He recommends a break-in period only to be sure the speaker is not defective.
My take on this subject is this: If you are designing a new, say DIY, custom speaker system, and you are relying on the exact characteristics of the speakers to tune the enclosures to the exact design you want, then you will be breaking-in the speakers so that the T-S parameters you need have settled to their final values.
If you are designing a speaker system for mass market sale, then you will design the enclosure for the specified performance parameters of your drivers. You will be performing AQL tests on the drivers, and the finished speakers, but you will never have the time to qualify every driver and speaker you produce. That would be too expensive.
So at the end of the day, economics dictates what happens. I would hope that $100,000 custom speaker systems have been broken in, but in my experience in pro audio, they are not. Break-in may happen during the testing phases of a large venue system, but it is incidental. Maybe somebody else knows about those uber home systems.