Ever had a set of roundwounds that were just way too bright sounding for you? I have. D'Addario Heavy Prosteels and Washburn lights.
My E string sounded practically like a piano when I first played it after stringing up.
The new Elixir strings. I don't know if they are brighter than the Blue Steels and Rotos or if they are just the wrong kind of bright, but I didn't care much for them.