Ferrite Chokes on ALL pwer cables-bad?

I have installed probably eight Ferrite Chokes on my power cords as a effort to lower the noise floor as much as possible. After installing the chokes the system did quite down slightly, however I'm not sure if I'm imagining it, but the sound may be a bit muffled. My system does use an AC enhancer and the chokes are installed as close to the power input as possible. Your thoughts?
Thanks,
Rpg