Selling my subs to afford head gasket replacement! these subs thump as hard as many 12s ive heard, and they sound best in an fbody. the sealed box is not particle board its a hard plastic type box (i dont know much about sub boxes) the box alone was 80$ subs cost me 100$ and you also get a 600 wt pyramid amp that really makes these things bump. i have the amp turned down because they bump so hard my inner organs got a massage. i have the box in the trunk hole upsidedown so that the whole frame of the car resonates the bass. $200 OBO!