Cables will yield nothing but the placebo effect, especially with your current amp and speakers, no offense. It seems to me like you’re focusing on all the gimmicky tweak stuff.
The only way to achieve the sound you describe is with good speakers, good speaker placement, a good source, and an extremely good SS amp or good tube amp. You’d probably be best served by replacing your Rotel with a decent integrated tube amp, or replacing the B&Ws with KEF LS50s or similar.
Go back to that Hi-Fi store where you heard that magical system and note what gear they were using, then start saving your coins.
The only way to achieve the sound you describe is with good speakers, good speaker placement, a good source, and an extremely good SS amp or good tube amp. You’d probably be best served by replacing your Rotel with a decent integrated tube amp, or replacing the B&Ws with KEF LS50s or similar.
Go back to that Hi-Fi store where you heard that magical system and note what gear they were using, then start saving your coins.