I just blew on of my old alpine type-r subs and am trying to figure if I should replace or upgrade, I have had them for about 2 years but recently upgraded to a 1000 watt memphis amp, which I was running with the gain all the way down and no bass boost until I got in a competition w/ a friend...., but I am looking for 2 12's that handle 500+ rms. Also should I also get another box or will the subs just drop in?