I recently purchased a pair of xm9's to replace my current tower speakers. Pretty excited with all that I have read about these speakers so far.

What some of my questions are;

1) will the current amp I have be adequate to power them. I have a rockford fosgate m600-4d.

2) if I wanted to add another pair, would the sxt9q compliment the sound or would it be better to get another set of the xm9's? And if I did add another pair, I know I would need another amp. What would be the amp to add? Would I get rid of the RF I currently have and buy one to run both sets?