I’m not posting as a response to anyone, just adding my own 2 cents. First of all, remember that we have all been born with the world’s best and most sensitive listening devices ever conceived - our own ears! Trust them - they are the one truth in music! I have experienced the tunable room in person, at Bill333’s place, and know that it works. I was left alone with the tuning wrench and allowed to experiment and make adjustments to my liking. It became obvious very quickly that the adjustments were very intuitive and easy to learn. I was able to turn a small and constricted sound stage into a large open and expansive one that extended in all directions around me! Then I was able to bring it back to points in between and eventually back to where I started simply by adjusting the tension on the panels. Less tension allowed the panels to vibrate more, extending the sound stage. More tension = less vibration = smaller sound stage. Pretty intuitive right? How do I know this works? My ears told me so! Tuning works my droogies! And while not all tuning is as intuitive as this, the idea of loosening things to allow them to vibrate more and increase the size of the sound stage always does work! How do I know this? My ears tell me so! Those who have not heard it have no basis to criticize it. Those who have not should try it. Those who have will know it works if they listen to the music with their own sensitive listening devices - their ears!
>>>>>>Not sure I go along with your detective work. The conclusion that “vibration is good” might very well be incorrect and lead to “over generalizations” that are false. The loosely of screws may actually be explained by reducing the physical stress produced when the screws are tight. The same idea applies to transformers that are generally bolted down tightly and capacitors that are constrained with tight cable ties. Reducing stress improves the sound. Voila! But the general conclusion that vibration is good is probably overreaching. One over generalization that is false is vibration is good. And that leads to another over generalization that is also false - isolation is bad. 😬

