Excellent factory replacement Whether you're building your first system or replacing some burned-out factory speakers, Rockford Fosgate's Prime Series R1675X2 6-3/4" speakers offer clean, powerful performance that'll keep you and your friends rockin' as you drive. Plus, Prime speakers are a great way to get Rockford Fosgate sound quality without destroying your bank account. Better components give you more detail Each 6-3/4" speaker sports a stiff polypropylene woofer cone that delivers strong drums and bass, along with clean reproduction of the midrange frequencies. Rockford Fosgate mounts the silk dome tweeter flush with the woofer so it'll fit in more vehicles while adding the excitement of strong high-frequency response. The built-in crossover network divides the frequencies going to each driver, so all your music plays faithfully. Grilles are included. What's in the box? The embedded design maintains the correct phase relationship between the tweeter and woofer, and doesn't add to the speaker's overall height. Klippel Analysis: By using a state-of-the-art Klippel Distortion Analyzer, Rockford Fosgate engineers can optimize the speaker's motor structure, voice coil alignment, and suspension for the best possible performance and the lowest distortion.