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You can build a system with no power source by just wiring the two speakers as if they were earplugs but it won't be very powerfull. The two speakers should be wired in stereo. On the jack plug, you have 3 connectors, 1 for the mass, 1 for the left channel and 1 for the right channel.
You should easily find on the net diagrams to built the equivalent of a small amplified speaker system using a battery. I remember building one when I was younger (14 or so) during my electronic classes.
Hope this help
Phil
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