The only product I've used that actually improves the sound without restricting dynamics (assuming you don't connects a total of components that will draw more than 1500 watts continuous) is the PS Audio Power Plant Premier.
However, this is a power regenerator and conditioner.
I used in on all my source components, a TV and a surround amp.
However, this is a power regenerator and conditioner.
I used in on all my source components, a TV and a surround amp.