It depends on a lot of things. I too have dedicated lines and I find power conditioning makes a huge difference.
I have tried the Audience, as well as Shunyata, Exact Power, and many others. The Audience was very good, and bested all others except the new Synergistic killed it. The difference was not subtitle at all!
I am also using really good power cords which make a real difference as well. Unless all aspects of the system are working well you might not be getting the resolution necessary to be getting the improvements that the conditioners can produce.