Looks like you need an 1/8 inch (female) to RCA jack(male). The RCA's will plug into your table, and the speakers will plug into the female jack. (Since the subs are built into your speakers, you won't actually use the sub out on your table). Radio Shack have these, not great quality, but they're cheap. And to be safe, make sure the volume on your tables is down, so you don't blow anything out - I don't know the output level or your tables.
Hope that helps.