PS Audio Power Plants

My music on great days sounds three dimensional with  great sound stage depth, good solid bass , and no harshness on the high end.Those few days, I may listen for hours, However most days it sounds flat with no depth and I can't listen for more that 30 minutes or so. This is not a new thing. Its been happening through all different equipment and several houses for years
Has anyone had this experience and would a PS Audio Power Plant like the P10 or P20 help?
Thanks