I'm sure this has been asked before, the only things I could find using the search are kind of dated. From what I have read it seems like the top contenders are from JL, Alpine and Memphis. I'm asking this for a buddy of mine, he just wants a sub. He isn't really looking for anything specific for sq or spl. Just wants a sub in his truck that sounds good and clear. Didn't really set a price limit either. Thanks.