There is an excellent recent article on this by John Atkinson in Stereophile; you know, the guy that does all the measurements. It’s worth the read. Of course, there are many other articles on this, as well.
From what I’ve read, there are many factors that affect "line hash" and other power issues. Generally speaking, you are much more likely to have measurable "line hash" if you live in a larger city, as opposed to a burb or more rural area with good or reasonably good electricity delivery infrastructure. The age and/or quality of the wiring in your home is an important factor, as well.
I’ve been using a Monster power conditioner for many years. I honestly can’t recall hearing a difference when I started using it with the system I had way back then. If there was one, it was likely very subtle, which is why I have no clear recollection of this. Usually, when something blows me away, like speakers or a component I heard even 50 years ago, I remember that component, its model number, the shop or place I was in at the time and who I was with. So, I’m relatively certain whatever difference there was with the Monster was subtle, at best. At this point, I wouldn’t dream of leaving it out of my chain because of the protection it provides to my components. Best way to arrive at your own conclusion on this is to try it. Worst that can happen is you take it back for a refund.
From what I’ve read, there are many factors that affect "line hash" and other power issues. Generally speaking, you are much more likely to have measurable "line hash" if you live in a larger city, as opposed to a burb or more rural area with good or reasonably good electricity delivery infrastructure. The age and/or quality of the wiring in your home is an important factor, as well.
I’ve been using a Monster power conditioner for many years. I honestly can’t recall hearing a difference when I started using it with the system I had way back then. If there was one, it was likely very subtle, which is why I have no clear recollection of this. Usually, when something blows me away, like speakers or a component I heard even 50 years ago, I remember that component, its model number, the shop or place I was in at the time and who I was with. So, I’m relatively certain whatever difference there was with the Monster was subtle, at best. At this point, I wouldn’t dream of leaving it out of my chain because of the protection it provides to my components. Best way to arrive at your own conclusion on this is to try it. Worst that can happen is you take it back for a refund.