I am also skeptical, but at the price it might be worth trying. At least it can function as test gear, even if there is no effect on the sound quality.
The supposed effect of AC power noise is a mystery to me. I have a light over my turntable which is plugged into power from a dimmer. Dimmers are supposed to be a disaster near audio equipment: I expected to turn the light off while listening. However, the dimmer has absolutely no effect on the audio equipment. None. Nada.
This is a relatively new dimmer. I have another decades-old dimmer installed in a portable junction box that I use for powering christmas tree lights. (If you drop the voltage a bit the bulbs last much longer). It causes a bad buzz.
There are dimmers, and there are dimmers.
The supposed effect of AC power noise is a mystery to me. I have a light over my turntable which is plugged into power from a dimmer. Dimmers are supposed to be a disaster near audio equipment: I expected to turn the light off while listening. However, the dimmer has absolutely no effect on the audio equipment. None. Nada.
This is a relatively new dimmer. I have another decades-old dimmer installed in a portable junction box that I use for powering christmas tree lights. (If you drop the voltage a bit the bulbs last much longer). It causes a bad buzz.
There are dimmers, and there are dimmers.