sometimes RCA cords.. the wires are too small, and even too weak, to be useful.
it might be quicker and easier to get a pre-made rca cord with cut off ends.
these are like speaker wire, not the coax type.
i have split into coax wire as small as usb cords.. they get tiny and arent worth the hassle because they are fragile.
i dont know the size of the wires with that speaker set.. but if its the same thickness as a keyboard cord (or mouse cord) then its probably safe and wont cause much frustration.