Reddit mentions of RoadPro Replacement Speaker Wire 10 ft With 3.5mm Plug to Stripped Ends

Amplifier

PA horn

CB to Amp cable (standard 3.5mm aux cable)

You’ll need speaker wire to run from the Amp to the PA and you’ll need to power the amp somehow. They sell an AC to DC power supply but if installing in a 12VDC vehicle you can run 12v to it directly but you’ll just need the barrel connector / plug end. You can buy those on amazon as well or if you have access to electronic scraps or spare laptop power supplies you can hack one off there and wire it to your system.

To use the speaker without the amplifier, not sure how loud it would be, probably not very because the CB can only put out like 12-15 Watts on PA, you can use this cable to hook the speaker to the CB

Hope that helps.

Those are called spring clips.

You could buy something like this: http://www.amazon.com/electronics/dp/B001JT33F0

You'll also need wire strippers.

If you're hooking cheapo computer speakers to a proper amp/receiver then you might blow them as they probably aren't designed to take very much power.

You'll need a couple of things.

Get and plug one of these splitters into your MacBook Pro or iPhone, which ever one you are using at the time.

http://www.maplin.co.uk/p/35mm-stereo-to-2-mono-splitter-l39ba

Also; get two of these, one for each speaker.

http://www.amazon.com/RoadPro-Replacement-Speaker-3-5mm-Stripped/dp/B001JT33F0/ref=pd_sim_23_4?ie=UTF8&dpID=41FJjtNq8YL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1Z8WC5YTNYAK763S462S

Plug their jack ends into the splitter ends above, then run the bare wires from each one to one of your speakers, making sure the wire with the stripe on each line gets connected to the red terminal on the back of each speaker and the other wire to the black terminal.