Sony DAV Sb300 SUBWOOFER connection

Hi,

I have Sony DAV SB300 system and I was going to change the dvd/reciever unit for seperates but keep the speakers. I know that I can connect up the speakers to another amp without any problems but will the connections for the sub be possible with a seperate amp? The conection at the moment involves 2 cables similar to the standards speaker cable. They claim the sub is active so I assume one delivers power and the other sound however I am not sure how sub connection are made on a standard amp and amp concerned that the two will not be compatible.

Any help with this would be greatly appreciated