Maxxsonics USA is a leading manufacturer and distributor of quality car, marine and home audio/stereo products. Maxxsonics USA offers a complete line of sound component systems though it's family of brands which include: MB Quart, Hifonics, Crunch, and Autotek.Hifonics features some the world's most powerful car amplifiers and car audio/stereo products. Hifonics amplifiers, subwoofers and speakers are the top performers in some of the most demanding SPL competitions around.