dj/pa style speaker question

Hello fellow a-goners. I'm usually the one all my friends come to with gadget/stereo questions, and this time I'm stumped. My friend purchased a pair of dj speakers from craigslist because they were enormous, and 'looked awesome' he then realised that the plugs in the back were Mic jacks and he couldn't figure out how to hook them up. He asked me to try and figure it out. After tirelessly trying to figure this out on my own I am now looking for help... What he wants to do it connect these speakers to a home receiver. I have found that I can get a 1/4 to naked wire that will transmit the power.. what I don't get it why there is one input jack and output on each of the speakers.... Does this mean that the speakers must be run in series? or do they require some kind of 'return signal' to the receiver. If I were to use the receiver, how should I wire it. Now, I realize that the proper way to do this would be to use an amplifier and mixer, but that's not going to happen, lol. I know the speakers are 8 ohms and rated for 150 watts rms... Any thoughts?