Speakers stored in a garage for a decade?
Let's say if a set of speaker has been stored in a dry space for a decade(working condition when stored).. What are the chances that they are in working order?
If the conditions in the garage were hot or humid,
the surrounds may have rotted as well, especially if they are made from foam. At the very least you may have to re-foam them. The best storage conditions for speakers are at room temperature, without extremes of temp and humidity, and most definitely not in direct sunshine. I speak from experience.