Raymonda nailed it when he said
computer modeling which cuts R&D costs substantially, and
lower cost manufacturing sourced from third world countries.
At the other end of the cost spectrum are the high 5 to mid 6 figure speaker systems which would have been beyond anyone's wildest imaginations "back in the day".
generally one can spend less today and get much better sound per dollar than yesterday.IMO, partly as a result of what Timlub said:
Material technology... we now have Kevlar, carbon fiber, magnesium, aluminum, ceramic, pulp wood fiber cones & yada yada yada... This has changed along with a much improved manufacturing process. We used to have measure 50 drivers to match up a half dozen to tight tolerances. Today, they come off the line within 5% or better tolerances... Combine that with better caps & resisters along with compensation circuitry not typically used back thento which I would also add:
computer modeling which cuts R&D costs substantially, and
lower cost manufacturing sourced from third world countries.
At the other end of the cost spectrum are the high 5 to mid 6 figure speaker systems which would have been beyond anyone's wildest imaginations "back in the day".