Built a set of speakers in Juiy. They sound different now than then, subjectively Better (now at around 200 hours of use)... as experienced by a 1/2 dozen people in our Vinyl Club, family members and myself. If it is a Placebo Effect, the PE has been consistant through variously aged people, the frequency of their exposure, Digital sources, Analog sources, different placement in the Room and other variables.
A very impressive Dummy Treatment...we are all fooled and happier for it.