Thought: Couldn't you have two Airport base stations, one in the house and one in the car, and treat them as two seperate networks? Even though the base stations can't communicate with each other, IIRC it's designed such that there can be multiple networks in the same airspace.

It's not a perfect solution, but you could just use the regular base station most of the time, and when you want to bop songs over to the Empeg, just switch to the car base station.

Heck, maybe you could even be connected to both at the same time, I have no idea.

Alex