There’s a LOT of snake oil in the audiophile world, and the matter of cost is almost universally a matter of diminishing returns. I say this as someone whose typical audio rig costs at least $250k: At home, I use basic Sennheiser monitor headphones.

You’ll notice a huge difference between $50 headphones and $100 headphones. But the difference between $100 headphones and $200 headphones will be much less noticeable, even though there is a much bigger price difference between the two.

Also, you probably got scammed on that balanced cable. I can guarantee that the recording studio used the cheapest $1/foot starquad cable, soldered by the intern using $3 Neutrik connectors.