:withhomo:withhomo and yes you should break it in. you should play it at about moderate level for at the very least 30 hours (not continuous), about 2 weeks worth. This is what I was taught by several company representitives. breaking in allows the spider, which is a part of the speaker that helps maintain linear movement of the voice coil, to maintain control over the entire cone movement.
I always thought that if you could smell the sub, it was getting burnt and the power should be turned down so it does not blow the coil?+1 on the two weeks, if you have ever smelt a funny smell with a new sub, that is the voice coil breaking in, my 2 12'' W3's stunk up my car like a mofo, which is normal, you can set your bass levels down a bit just to be safe too