I know this is a noob question, but I have only recently started upgrading to serious audio equipment, one component at a time. I recently purchased a pair of M-Audio BX8 D2 monitors, which are connected directly to my PC with a mini stereo jack to dual XLR cable. I would like to connect my Lava LSP10 subwoofer to my setup, and I do not own a sound card and do not plan to purchase one just yet. Each of the monitors is active, and I am not sure what cable I should purchase to do so.
Here is the back of my monitors:
Best picture I could find of the back of my sub:
I would not like to purchase any components besides the cable at the current moment. What should I purchase?