The AudioQuest Niagara 7000 is seamless and (for me) has done the trick. It does not touch the sound. Have compared with direct into wall and all’s well. The AudioQuest Niagara 5000 should preform the same as the 7000. The price for the 7000 has gone up up up.
Power regenerator vs conditioner
If the goal is to improve the sound quality (soundstage, detail, dynamics, etc) and the issue is "noisy" AC, it would seem to me that a power regenerator such as PS Audio P15 would be far superior to a "conditioner" such as a Shunyata Denali or Hydra or Triton. Is this correct? Thanks .