[. . . ] KICK-WOOFER SPECIFICATION SHEET ECP66KICK ECP66KICK KEY FEATURES: 16. 5 CM EURO-DIN ALUMINUM CAST BASKET 20 OZ. [. . . ] 80 Hz BREAK-IN INFO If ­ for some reason ­ the provided crossover frequency suggestions cannot be applied within your specific vehicle or sound system, please contact your EMPHASER dealer for further assistance. Loudspeakers using spiders made of ConexTM material need extra time to break-in!To achieve optimum kick bass response, this EMPHASER ECP66KICK speaker will need approximately two weeks of daily playing at medium playback levels. After that period of time, the suspension system has reached its equilibrium and will remain stable for the entire life-span of this product. The broken-in KICK speaker will play audibly smoother and exhibit a stronger bass performance, as well as greater bass extension!Please do not send any product to EMPHASER Inc. , Wyoming, Michigan U. S. A. Should you have difficulty in finding an authorized EMPHASER dealer or service center, details are available from the national distributor in the country of purchase. [. . . ] Should your EMPHASER kick woofer require warranty service, please return it to the retailer from whom it was purchased. WARRANTY [. . . ]