In my previous system this was a night and day difference and a must to be at least listenable. The twitter was so bright and over accentuating everything that it sounded like knife sharpening. The sibilants were ear piercing. At that time I lived in a 65 year old townhouse with potentially the worst electricity ever. For example, the system was completely unlistenable between 6pm and 9:30pm. After 9:30pm you could listen to it as it sounded a bit better. Weekend mornings sounded ok too. My friend is an electrician. I asked him if he can pull a dedicated line for me to plug in the gear, we decided on 20 amps. I bough an Audioquest Edison plug and he put it on that dedicated line. Things improved in terms of dynamics but the brightness didn’t. I then bought the Niagara 5000 power conditioner and 4 Monsoon and 4 Cardas Cygnus power cords. Some components liked the Cardas better, some the Audioquest but the main difference was that all the brightness and over accentuating went away. It literally disappeared and the tweeter became very relaxed and natural sounding. This literally was a night and day difference for my system. Your mileage can very however as these things are system dependent. It is better to play it safe and try before you buy.