The JackHammer series are loaded with features that make them rock. This product features rubber surrounds that are stitched directly to the cone for durability and have voice coils that are wound with 428° high temperature wire to ensure that your JackHammer subs will keep pounding the streets as long as you want them to. And it also features MTX's proprietary... More Spider Plateau Venting technology which helps push hot air out of the voice coil and bring cool air in, adding to the reliability of the subwoofer and keeping it cool this retails for 119.00 $$$ call 801-679-0607 or 801-634-7242 make sure to leave a message if no one answers or shoot an email to schfifty5iv@yahoo.com Location: kearns it's NOT ok to contact this poster with services or other commercial interests utah