If you have an old computer speakers, you can turn them into speakers for phone or MP4.
Turn Your Old Speakers into New
Turn your old computer speakers into new ones for your phone or MP4.
Open your speaker.
Cut the wire that goes from the transformer to the circuit board and connect it to the batteries (9V battery).
You can insert new speakers if you want. I will add this little high-def.
Cut the holes for new speakers or add another box with speakers.