I need to add a SUB. Please HELP ME

Hello. I'd like to add a sub to my 2 channel system, but I don't know if I can do this with my integrated amplifier (MF a300) which only have one pair of preamp outputs (RCAs). Is it possible to do that with this amp? If so, please tell me how. If the answer is "yes, it is posible", is it possible with all subwoofers or just with some ones? THANK YOU!!!!!!!