Interesting thing, a door speaker went out in my wife's Nakamichi-powered Lexus a few years ago. I was surprised to find out that the speaker had a paper cone. It was enclosed in a complex molded plastic acoustic chamber rather than just screwed into the door panel.
I replaced the blown speaker with a much "better" one, and expected to want to change the opposing door speaker to match the tone and quality. But they sounded identical playing CD audio. I think in that case, the sound quality was driven more by the enclosure than by the speaker.
In the Maser, I generally listen either to the news or the engine.