Motorcycles are 12v systems like cars, so theoretically a stereo would work just fine. My plans are to get a marine stereo with a wired remote, and mount the stereo in the saddle bags (My bike a Pacific Coast by Honda has a trunk, which is super easy and convenient).

The trick is how to control the stereo while riding. Theoretically I could have gotten one of the sony wired remotes, but that won't handle a lot of water (rain) very well, and I couldn't see the actual display, because the empeg would be in the trunk. Plus, the empeg wants to be mounted at a certain angle. This presents a bit of a problem. Last issue: The empeg needs an amp. More power (Which I don't think the bike has) and more space used up in the trunk.

Some marine stereos come with waterproof wired remotes.

As for the headphone problem, you're right- It's illegal to cover both ears in California. So I'm going to put 2 4" waterproof speakers in the dashboard. My bike is actually equiped with cutouts for this. It should be a neat project!

Mark.