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How to play your ipod or mp3 through an amp
Discern the type of amp you have.
Most modern amps have standard rca audio inputs (similar to the red and white inputs on a television) on the back. Both these and the output on your ipod or mp3 player are 3.5 millimeters, so they'll work with standard auxiliary cables.
Some old models of amps have 6.35 millimeter inputs, which match 1/4 inch headphone adaptors. These won't accept standard 3.5 millimeter auxiliary cables.