I don’t know about their cans but I do know that in the early days of ear buds I played a Cat and Mouse game with Sony where about every second new model they produced had really good bass response, often in a fairly reasonably priced model. I ended up buying backups to carry me through to the next next model. Looking back, I wonder if Sony had two teams with alternating release cycles, and the engineers on one team were better than the other. If it was some sort of marketing strategy it’s over my head.