Seriously Though
If you want to make the sound louder than that of a computer with the little 5 watt computer speakers you are going to go to a car system like many of the teams have. Most portable CD players will have a line out jack or an adapter to take the headphones to a variable line out with RCA's. You most definately will have a 12 power source similar to the robots or as big as a car battery. Next will come a 12v car audio amplifier with something in the range of at least 30W probably just a 2 channel, finally the speakers, automotive 4 ohms will work the amplifier better than home 8 ohm speakers. The amplifier and speakers can be found at most stores but better yet go to ebay and buy it on the cheap. Hook it all up, use the CD player for the volume or the amp might have a line level adjustment. A good speaker size would be 6x9, they have OK base for their size but if you want more get at least an 8" sub also (10-12 prefereable)
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