+1 to all the great recommendations on how we can objectively improve the the subjective goal of our objective - great sound.
I think we have some opportunities to explore:
Will sound quality in your system improve with age time as the house wiring "burns in" and do breakers vs fuses affect that. My uncle’s home is completely off-grid and I would be interested in testing my system on his full solar powered home vs the nuclear vs the fossil fuel. As we all know the grid can be dirty especially when those electrons travel into our systems unabated.
As with all tweeks suggested in this thread...try it out
As @emergingsoul suggested with his golden vs black dog experiment. Would a golden doodle be better than a retriever? Does a brindle mutt result in muddy listening or a "best of" typology that pure breds can’t duplicate?
My one caution in all of this is not to smack your head as Deep_333 suggests as that may cause increased tinnitus flaring and deep cranial ringing.