Pa speaker help

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No sure if this one has been posted yet but I need help. I have gotten my hands on a speaker from an ice cream truck. It has three wires coming out.
On my cb radio there is a plug in for an audio jack, I think 3.5mm whatever size is standard to fit in a cell phone or iPod. I need your help to fill the gap lol
Bare with me while I figure out how to post pics
 
I think XJ has a CB radio with a connector for an external speaker (most have one, never seen an input jack). You probably would need to amplify it, but I've seen them power small PA horns.... try it and see if it's loud enough for your need! Oh, the 3 wires... speaker must have two voice coils (to accept stereo?). Pick the black one and one other color to try out, then swap for the other color.... Better yet use a DMM and read ohms to make sense of them...
 
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If this is your average PA speaker from an ice cream truck it looks like this:
 

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