The 4th article about headphone measurements, curves, rigs and researches.
The 3rd article about headphones measurements.
Let’s start by answering a simple (but not too simple, actually) question: what are the headphones sound parameters that can be measured at all? Or, more precisely, the sound parameters that are usually measured. I’ve divided those into two categories: the main ones – the most significant and frequently cited, and the additional ones – less significant, but also important.