The RE x.x.x's old sub will be louder and clearer...but it all depends on your setup...nooone here can tell you what will be better for you unless u audition both subs
i think you'd have a hard time distinguishing between the two. both are great subs. i'm a xbl2 man myself, but would purchase a d9, crystal cmp, id max, Ti, or w6 any day of the week.