There is such a thing as break-in! The speaker surrounds, which is usually rubber (sometimes a composite used these days), connects the cone to the speaker basket. It's usually pretty stiff from the factory. imo, it usually takes a week or so depending on the speaker and how you use it. Just vary the types of music and volume, and don't crank it up too much initially. Heavy heavy bass at high volumes- not a good idea for break-in.