I agree re AC mains. The biggest improvement I ever had was adding a dedicated Hi-Fi ring main from the mains fuse board (I am in the UK). The old house power outlets which connect to the other house sockets remain and sit next to the new dedicated Hi-Fi ones. This means I can easily A/B demonstrate the difference and everyone I do this to is amazed at the difference.
Some say say you need thick cable but I just used standard internal wiring. I found no need for expensive sockets: I put 3 double sockets in the Hi-Fi mains and I tried one soctet with gold plated contacts, and two standard sockets - no difference between the two.
Total cost = £600 ($800). Amazing upgrade.
Some say say you need thick cable but I just used standard internal wiring. I found no need for expensive sockets: I put 3 double sockets in the Hi-Fi mains and I tried one soctet with gold plated contacts, and two standard sockets - no difference between the two.
Total cost = £600 ($800). Amazing upgrade.