Great music in my Barracuda for only $70.

70dart340 said
It would be perfect if you could wire the rechargeable speaker to be powered form the car electrical system.

I could, but I usually only cruise around for an hour or so, and the speaker's battery lasts for several hours.

diymirage said
Depending on what voltage the speaker takes to charge, that can't be too hard

I'm guessing most of em now use a USB wire to charge it
Not too hard to wire a USB plug somewhere in the car

(I have one wired into the ratchet shifter housing)

I could use the same type of a cell phone charger that plugs into a cigarette lighter. That is how I charge it at home.