Why would you need a re-cone when yor buying brand new? Only time you need a re-cone is when you push on the sub and its not stiff and that thats from LOTS of play time or maybe abusing it over and over. On 1700 rms it aint going to phase that Z. I got 1 sa-15 and i feed it 1100 and its slamming no probs. SUNDOWN FTMFW!!!!