I am guessing that “dark” means to reduce the noise floor. By doing that, you improve the midrange and treble… and reveal more details.
You want a well insulated power cord… and if you don’t have them direct lines. There are some missing posts. But installing direct lines may cost a $1K or a bit more, but well worth it and does the same. You want both. A direct line for components / power conditioner and a separate one for your amp.
I would look at a Cardas Reflection power cord.
I would need to know the rest of your equipment and venue to say much more. This is a very generic recommendation based on little info. There is a place under your user ID to photos and I’d your components. This is really helpful. And once done, you don’t have to keep repeating it.