I posted this under your other post so I will put it up again:
Um....as long as the 15's are in good shape and the box is 3/4" MDF or one of Kickers pre made boxes than those are good.
Alpine has been making stereos for a LONG time so it could be a **** cassette deck without knowing the model number, and loose the Directed amp...they are crap.
So, ask to buy the subs and box (if it is good) for $100 and buy your own amp and deck (unless the deck is newer and in good shape).