WOW, man my stuff pounds so dam hard its insane. these woofers are no joke. they have kevlar reinforced paper cones , 3 layer surround foam, 12 spoke chrome baskett, two spiders that are bolted down to the baskett. 3" high temp alim coil. cnc coil and former. huge front and back plates. man i have had t3's and solobarraks but ive never herd two 12's do what these do. man my eyes are still shaking. lol. besides that they gave me a good discount to compete with there stuff i only had to fill a paper out and take pictures of the install and ill have to send in my competition results. my freind is talking about getting 2 15's or 3 12's on there 5000d i couldnt even imagine that. i bought the alpha series woofers they are made for a mix of spl and sq if u can beleive that at 2k watts . but they also offer a elite spl woofer that is almost the same looking but it is more efficent and geared for spl . i can handle 4 k bursts. if there site doesnt go up soon i will take some pictures.