Equitech 2q or NBS would be my suggestions depending on the problem you encounter with your power lines... also, if you don't need to, don't use them for amps (as Elizabeth suggested).
For Digital (on my power lines), PS audio and Accuphase are both quite good.
My $0.02
Jacob
For Digital (on my power lines), PS audio and Accuphase are both quite good.
My $0.02
Jacob