The power in my apartment is quite noisy. I don’t have the option of adding a dedicated line in my apartment, unfortunately.
I have experimented with higher-priced multi-outlet power conditioners and the P5 power regenerator, but they are all too heavy for my headphone audio rack, so they stay in the main system. (I am temporarily using a Furman Elite PF-15i power conditioner and/or a powerstrip.) In their absence, I am looking for reasonably-priced noise-reducing accessories for my headphone system.
I have had a Blue Circle powerline pillow for years, but have never really noticed any audible benefits from it.
I obtained four of the PS Audio Noise Harvesters a few years back, and installed them in various outlets in my listening space, but have not noticed any audible benefits from them, either.
Recently, I purchased a Shunyata Venom Defender and plugged it into the same outlet as my equipment. I immediately noticed that the music sounded a little louder and a little clearer. Not a huge change, but definitely noticeable.
I’d like to hear about others experiences with these types of accessories.