Active subwoofer install

I am looking to add an active subwoofer to my current set up. I currently have a Kenwood KA-660 integrated amplifer with Jamo D365's. Am I right in thinking that to add a sub I would power my speakers from the sub through speaker terminals? If so what sub would people recommend? I would appreciate any advice on what sub to look for, the best way to connect it and any amps that would be better for the setup, thanks