Will i break these subs with is amp i cannot break any more subs .........i just want be louder than my old?

There's no way in hell that farty amp should blow your subs, and I can't see it blowing any others to be honest either, ever. Are you warming them up properly, or are you just whacking them up to full volume? There's a lot that can kill a sub, other than running too much amp power.