does anyone have an opinion on the crystal cmpx2 I am currently saving up to buy a new amp and a sub looking at the PG tantrum running it at 4 ohms to one 12 the cmp looks good and the ed A or XXX or the w6v2 leaning towards the cmp because of the ideal box size for my car looking for 60%sq and 40%spl. may even keep current jl 500 which of these subs would work the best with this amp any input would be helpful, thanks.