I use Power conditioner from Mr.Murthy. Did make good difference to sound to my devialet 120 amp. His charges are nominal and great quality, it weight more then 30 kgs, it took me big effort to carry it to 2nd floor where I live.
Also power cables from his Awesome. when I was in USA, did try PS Audio P5 it did not make any difference, probity because power there was much clean compared to bangalore. Mr. Murthy 's charge hardly 5% of what PS Audio would cost me here, with Awesome result