Playing the SA-8 v.2 at varying levels of excursion. At all but the final level of excursion at nearly 2.5" p-p the driver is super quiet mechanically. You hear some flutter from my hand-held camera mic and a small amount of air movement through the cooling vents and that is it at lower levels. Not until the farthest amount of excursion is there an unpleasant mechanical noise to the driver at all. If the driver is turned up loud enough to produce this level of throw in-vehicle and in a box chances are it will still not be audible over the bass output.