No replacement for displacement in cars used to be true - turbos, superchargers and electric motors have demonstrated that’s not true anymore. And in the hey day of muscle cars a 7 or 8 second zero to sixty was fast. Many economy cars can beat that today.
The improvement in crossover design and materials has dramatically improved speaker design.
Enjoy your journey! My current speakers are so much better than my Cerwin Vegas and Advents I had so many moons ago.