graphs are meaningless if you don’t like the sound
True, but all graphs and measurements are the basis for a good product They save a lot of time if you can understand them selecting the good from the bad. And can save you a lot of time knowing what will be compatible electronically with what, instead of wasting money and time on things that have no chance of being compatible.
Knowing if they have a good Electronic Engineering design to start with, and are not just a poor design that’s someone has thrown together in a nice glitzy box without any regard for measurements or testing.
Cheers George