Im looking into buying two of these american bass 12's for $400 The guy says they are D4 HD series Problem is: american bass dont make the hd in d4 (idk about the past) Im trying to see what kind of sub it really is, if its the xd thats a good deal any lower series its not a good deal hes going to send a pic of the back of the magnet in a couple hours after work which american bass sub is this? heres a pic he sent me thanks