,,,Tried boom boxes but they tend to die early when subjected to the rigors of off road travel and camping... (I have to pack pressurized drinks separately to keep the cans from wearing holes in each other during trips)
made do with several brands of small wired speakers with various 12 volt and 110 volt inverter powered amps (at one time or another).
...finally have settled on tunes stored in my phone providing signal to blue tooth speakers....the sound isn't great or even good; but its tunes...
Enjoy!