electricity

I am illiterate in electrical and electronic engineering, so I barely know Ohm's law, so bear with me. I am trying to calculate the best gain settings when using the A90 Discrete with the D90SE in 5.1V mode. I am using this image: I want to calculate the best gain possible if my DAC can...

I've read about the PS Audio P12 being ineffective on this site. I also watched the YouTube video with the PS Audio Noise Harvester not doing anything useful. Power conditioners can be sold for hundreds of dollars or a lot more! Do these products actually clean your electricity? And if so...