A:AnswerAs long as the subwoofer you're powering is rated for a least 600w max it shouldn't be a problem. Also be sure to correctly wired it to 4 ohms, wouldnt want to sent 1200w to the sub on accident.
A:AnswerWhat model they cover a lot of ground with their rms ratings if you talking someing like L7 or Cvx. No. Some of the more entry lever lower rms Rated equipment yes.