Replacing the phono jack on your headphones is a fairly easy process if you know how to solder and an easy skill to learn with a few practice wires if you don’t. There are a few reasons you may want to replace the jack. First, you may be getting some crackling caused by a bad connection. Second, an angled plug may work better for your particular MP3 player than a straight plug. Third, you may want to upgrade the plug to something more sturdy and rugged (Neutrik, Switchcraft, or Canare to name a few).
The cost of this project is minimal. Even if you went with a higher-end military grade plug, you will only be set back about $4 for the plug. If you don’t have any of the soldering tools, plan on spending another $10-$20 on a starter soldering kit and the tools needed.
One of our forum moderators put together a great how-to on this. Check it out.