Most people I know never break in new ones and have good luck, but why take the chance? It won't kill you to play it at half power for a day or two, or at the very least play it for like an hour at med. volume then start to gradually turn it up. I wouldn't bother with certain frequencies and frequency sweeps (at exactly 15 mm excursion //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif ) played for 40 hours. Just use common sense and play music. I definately wouldn't pop the sub in the box and just play it so hard it is about to bottom out though. Most think break-in is a myth, but it couldn't hurt, so I say do what you want because it's your sub.