This can be a science if you want it to be. Has a double blind abx test ever shown a difference for solid state headphone amplifiers? What difference do you perceive? Is there a way you could imagine measuring such a difference?

I’d love for there to be some way to compare amps together if there is such “unmeasurable” differences. Imagine abx testing an amp against known ranked amps to decide the rank of the new one. An amp hierarchy could be made!