You will need a dedicated sub cable, a single phone/RCA Cable will be good but dont spend silly money. Qed are very good and there is a good choice, Assuming you have a sub of course you dont say what you actually have????...in your question
Very true but it doesn’t look like he had to, it says he has Tannoy HTS 101's in his signature, which I believe is a 5.1 system unless I’m very much mistaken. This includes an active subwoofer rated at 100 watts.