I have noticed that when I bought my HSU STF-2 (a few weeks ago) the driver was harder to push in with your hand than it is today. I have noticed this with other subs as well, when they are new the driver is very stiff and harder to move, but after some use becomes easier to move with your hand. Is this normal for subs and just the driver breaking in? I would think it would be a good thing if it was easier to move with your hand, because that would make it easier for the amp to drive it. Any thoughts on this, I know I have heard it mentioned before.