I have an ifinity basslink in my car, I think I pretty much cranked it from the get go. Well anyways, after 2 or 3 weeks, the bass was noticeably more. This was the only speaker that I ever noticed, that had a breakin period.
The infinity basslink is a powered 10" sub with a 10" passive radiator. If anyone is ever looking into one, theyre actually pretty good, not earth shattering, but a healthy amount of bass.