I have portable speaker with no power source and i use them for my ipod. The speakers on my ipod are louder. Any idea how to make them louder?
Speakers with no power scource are going to be very quiet simply because they have no means of amplification. An amplifier needs a point source. You can't make these speakers any louder. You will need to buy new speakers. Preferable some with an amplifier. If you try plugging them into an amplifier as the first answer states, you will simply blow these speakers. Non-amplified speakers like the ones you have are specifically made for low wattage usage.
connect you speakers to an amplifier or buy an ipod amplified docking gizmo.