Do Subwoofers REALLY Need a Break-In Period? (the answer will suprise you) There’s a ton of debate in car audio about subwoofer break-in periods — so we put it to the test. We asked real customers and our install team whether breaking in a new subwoofer actually matters. Most agree: proper amp tuning matters FAR more than babying a sub for weeks. Our master tech demonstrates on an oscilloscope how clean sine waves, correct gain structure, and zero clipping are what truly prevent blown subwoofers