The signal coming from that plug is amplified(powered if you will, it is much stronger then the one that entered the system from the computer) and is at a higher voltage audio signal that the speaker will playback without need for any other power source. The wires for the one speaker are clearly internal and the other has the long(but not long enough wire) heading to the other speaker. Inside that speaker, the amplifier makes the incoming signal powerful enough to drive the speakers. That same speaker also gets the stereo audio signal. In this case, you have power(12 volts if I see it right) running into one speaker.
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