And that of the best designers in the industry including Nelson Pass, John Curl, William Z. Johnson, et. al. Even McIntosh!
Music appreciation is
not a scientific endeavor.
It literally took minutes to swap them out since they are socket mounted. And I could have returned them if I didn't find a valuable improvement. I've purchased a number of audio components to try out that I either sent back or sold. While it didn't transform the modest Music Hall DAC into the performance of the Audio Research, it certainly brought it closer.