Cable management is the cheapest upgrade you can make!

I doesn’t cost anything, but a little work and time can reward you with a lower noise floor which 
will result in: more air between images, greater sound stage depth and higher level of transparency.
keeping power cables away from analog signal carrying cables is a must. Arranging how power cables cross each other: should be at right angles and if parallel should be at least 3-5 inches away from one another. Worked for me in a way I never thought I’d hear!