One more question, the radios they had in my yout' used a rheostat to control sound volume at the speaker/phones. This device always drew the same current, but dissipated excess amperage not drawn by the speakers as heat. So no matter how high or low you played your radio, power consumption was always the same. From what you said, I presume this is all taken care of today by digital electronics and power consumed is strictly a function of the air volume moved by the speaker diaphragms. Is this assessment correct?

My radio is a ETON/Grundig G4000A Yachtboy, AM/FM/SW, and it will run off either AA dry cells or off wall current. My batteries will last about as long as one of Fidel's speeches.

(Just joking, I've never been able to make it to the end of one of his speeches.)