http://www.fusioncaraudio.com/north-and-south-america/car-audio-1/bass-packs-9/repk2120-41-product.aspx#addninfo

i already have one of these but i plan on going bigger , i was thinking if that pack is worth the money just to get another and build a box for the four 12"s but i am just looking for opinions because i am more than willing to look into others. Thanks