True or False?

Oh, I read prof's statement as sarcasm. I believe he was sarcastically saying that some Audiophiles claim to have superhuman hearing, which they do not.

@prof - did I understand you?

False.  My components are probably reference class and expensive.   Every tweak mattered. I guess the more resolving a component the easier it is to notice a tweak 

The more revealing a system is, the more likely you will be able to hear any change when listening closely. The magnitude of the change and its positivity is subject to interpretation and exaggeration.

I have tried changes to internal vibration and isolation and the improvement depends on the piece of equipment. I find the turntable to be the most susceptible to external vibration and most improved by isolation. The amps had a more subtle improvement if any with isolation and coupling doesn't make sense because of ventilation concerns, and speakers in between with removing internal vibration by coupling it with a platform to a floor.

Anything that touches the equipment or the room acoustics can make a difference. Other hocus focus is environmental, not acousitical, and some may like that as well. It's just not an audio tweak. The degree and value is up to the listener and his budget. 

Townshend Pods under my tube integrated amp was at least as big an improvement as under the turntable. Podiums under my speakers was at least as big an improvement as under the amp. Hard to quantify these things, probably it was greater under the speakers. My turntable motor controller on the other hand responded poorly to pretty much everything I tried, until I tried springs and Pods. Both were clearly better, with Pods being the best by far. So I think it is risky saying it depends which component. It depends more which tweak. Evidence is they all respond well once you find the right tweak. 

+1 hshifi.  If you want to hear an improvement, install a Puritan PSM 156.