well i know everyone loves alpo... errr i mean alpine. when i had my system done, i could of when with alpine, but i choose a different route. i am not a follower of a certian product. i was told that these subs are really good, they are loud, i had them installed and all i have to say i wow. when i have my system hitting hard people are like what kind of subs you have i am like, they are diamond subs. they just look at me! i am not a person who plugs products, also i am not a person who is claiming my subs are the best in the world. just choose whatever you want, that is all!