I Believe the cups they say don’t effect SQ are the half cup for those who aren’t crazy enough to fully liberate their driver. I believe it’s well established that the tone woods have a big influence on sound.
When I compared one tone-wood I was using to Hard Maple I stopped making cups out of that tone wood because it sounded so bad compared to hard Maple.
In the back of my head though I always had that thought, am I imagining this, is my brain playing\ games with my ears?
I had a similar thought the other night after a loving tender moment with my wife. Am I really in love with my wife I thought………….. or………… am I just hard wired through evolution and brain chemistry to feel love so I can pass on my genetic material…..is the evolutionary biology god running a con job on my emotions ?.........................................Damn you Charles Darwin!
I have definitely noticed an effect from wood cups personally...tried it with two stock 225i and definitely noted a change.
I say calling love a simple evolutionary urge is just listing the components of something that is to be enjoyed regardless. Sometimes you don't want to look in the kitchen and see what ingredients go into your meal, you just want to receive and enjoy your meal