Yes, this works as advertised, the sound becomes smoother and more detailed. I am not sure if this is true but I have a feeling that this affects all the electricity in my house. A computer screen that sometimes flickered off does not do that any more. A light that flickered has stopped doing it. My wifi seems better. I am not sure if I am imagining those things but just the improvement in sound quality is very significant. This optimizer is a work of genius, recommended.