The Thunder5500 is the 'best' in the ""Best, Better, Good"" product line approach joining the Thunder4500 ('better') and Road Thunder subwoofers ('good') to offer the mobile audio enthusiast a wide range of options when choosing the bass for his or her journey. These subwoofers were designed with the customers in mind who are looking for rock solid bass and reliability. The Thunder5500 offers a variety of features including high power handling, rubber surround, tinsel leads woven in the spider mated to heavy duty chrome push terminals and attractive cosmetics. The voice coils are wound with 428 degree F aluminum, for an extremely reliable, high power handling subwoofer. These new subwoofers also feature MTX's proprietary Spider Plateau Venting technology, which ensures a cooler, more reliable subwoofer