Hello, No, You only need a one end to one end cable and on sub it goes in the input that says L/LFE. Same on Onkyo Rec, sub out 1 or LFE. Hope it helps.
Also I had a Friend of mine calibrate the entire System, if You have an expert please do so because this Sub is so powerfull since it has it’s own amplifier it can explode if not calibrated properly. Mine is with the Onkyo 9.2 rec.