Sound Extreme offers the best in Custom Car Sub Boxes, Car Sub Enclosures, Subwoofer Boxes, Custom Fabrication, and much more. We have over 20 years experience building nashville's Best Sub Boxes. We are also found on Nashvillesubbox.com and are nashville's Leader in Sub Enclosures. We are guaranteed to make your Car Bass sound seriously better. We have all different options for designs of sub enclosures, call us today to get a custom quote. we can build your custom sub enclosure anywhere in the Nashville area, including La Vergne, Smyrna, Antioch, Madison, Gallatin, Brentwood, Cool Springs, Mt Juliet, Lebanon, Rivergate, Hendersonville, Goodlettsville, and many surrounding areas in Middle Tennessee.