It is a known fact that hearing can and does fluctuate daily as does pitch perception. It can vary from mild fluctuations in healthy adults to rather severe with active disease process such as Meniers and other disorders. Not to mention the mood and how we perceive sounds and music depending on stress levels and other factors. I don’t condone the use of marijuana nor am i in the habit myself but we all know music sounds very different...
One can buy all the power conditioning they want but the fluctuations in how we perceive our sound system day to day will still fluctuate.