What is your experience with the law of diminishing returns ?

I don't understand the question asked, so if the OP could please elaborate a bit that would help.

If the question is about the direct correlation of performance plotted against price and the point where the performance curve begins to flatten against increased price, I stay away from that transition. I neither have the funds to spend in that region nor do I feel the need to waste valuable resources to gain such self-convincing, minor, improvements.

viridian: I hope they threw the book at you :)

When I first started upgrading, I could hear the difference.  However, I couldn't always tell if the upgrade was an improvement, just different.  Eventually I learned.

I hit diminishing returns when I couldn't hear a difference after an upgrade.  But there was still a  cumulative effect from multiple upgrades -- like I couldn't hear differences each time when upgrading amp, preamp, and cables, but after all three upgrades, I could hear the sound was better.

So I kept upgrading until I got to a level where my ears/brain had stopped learning and I really couldn't tell any more.

You guys gotta check it out. Low mass inexpensive systems are where it’s at. No more house AC, AC ground, no more speakers, speaker cables, amplifiers, preamps, interconnects, digital cables, fuses, no more transformers. No more distortion. No more noise. No more pencils, no more books, no more teacher’s dirty looks. 🧐