Earphone jacks are for earphones.
If you need to send the signal to something else it would be better to buy something with a line level output and connect it to an amplifier.
If you need to send the signal to something else it would be better to buy something with a line level output and connect it to an amplifier.
A better way would be to use the ipod with a dock with a proper line out (the basic dock from Apple has one).