Power

A dedicated line if possible 20 amp awg 10 lower resistance ,
and a 4 wire ,dual ground much lower noise , one is common ground ,
the other is a isolated insulated ground which for sure lowers the noise floor 
my Audiophile friend is  a master electrician and we tried 3 wire ,then 4 
and silver contacts on 20 amp breakers hard to find he had to source them took a month,and order $60 each x2 vs stock Copper $12 each silver breakers much better acoustically  copper needs to be changed after 5-6 years due to pitting oxidation ,silver, silver oxide actually is fine.and a solid Copper gold outlet 

The least expensive quality line conditioner, line conditioner 
the Audio Quest Niagra 1200 , $995 , at sunny Audio maybe a bit lower 
cheaper units use low grade AC sockets AQ great little unit 
next nit in their line $2500,