The Harley that I rebuilt in '99, still sounds the same as it did then. The two SEAS L26ROY 10's that I installed in my bass system, two weeks ago, do not. The judicious application of a low freq signal, is helping their suspensions, "break in." The music of my bike's pipes IS live. The faster the woofers SOUND live; the happier I will be. Some full-range speaker systems can sound right on the edge of horrific, until their x-over caps form and drivers limber up. Generally speaking; the better the system, the better the caps(Teflon, polypropylene, etc), and the longer the burn-in. Nothing wrong with speeding up the process.