The Midnight Effect - Who-How?

You have high end equipment designed in a way to make it seemingly impervious to power line fluctuations. You add expensive conditioners and/or power line regenerators just to be safe.

You sit and listen to your system for a few hours and everything sounds great. Then, from nowhere, like someone flicked a switch…. the sound opens up… becomes more natural, more focused… the soundstage suddenly blooms and becomes more dimensional, more depth and more space around instruments. WTF just happened? The only clue is the clock on the wall and the empty wine flagon next to your chair.

I’m long past questioning whether the phenomenon is real. To what extent it exists depends on certain variables, but it exists. But how? I live in the boondocks, there’s no industry or commerce that suddenly shuts down at 23:00 every night. 
Do others experience this? Do you have an explanation? Perhaps even some empirical data?

Is it just the booze?





You missed my comment about measuring you ambient noise floor at various times….. that’s ok….most audiophiles lack an SPL meter for level matching and other essential tasks…..

I caught your comment. It’s a valid enough point but I don’t think it’s responsible for the phenomenon that I’m talking about. I use REW for making room measurements and do notice changes in ambient noise levels at different times of day, but they’re very small changes. (Again, we’re in the boondocks and don’t have to deal with neighbors or road traffic noise). 
I can imagine some situations where it’s a significant factor in sound quality.


@knittersspouse okay that’s very interesting information. I hadn’t thought about electricity coming from different sources and each source carrying with it a certain type of “distortion”. That right there could be the answer I’m looking for. Skeptical me thinks that transformers and other components in the distribution network would remove these small line interferences but you seem to be saying not. Assuming you’re right, switches of this type should be noticeable and measurable using a ‘scope on the AC, right?

If you couple the psychological real effect in increasing sensitivity to sound at night with a more silent environment and generally no house heavy appliances working passed some late hours, less electrical disturbance in the neighborhood it does not need a Darpa research to feel a better acoustic experience in part resulting from decrease in the noise floor and more auditory sense relaxation ...😋


When i was doing my critical set of acoustics experiments for more than one year straight each day i waited in the evening late to verify the results and confirmed them or not,...Day listenings was not enough reliable...

By the way we do not remember sound details quality in a conscious way pass a very very short time. But my body remember it and remind it of some improvement or the opposite in the form of feelings when listenings...To experience this we must be totally relax with music we know completely well.. ..if it was not true i would have been unable to tune 100 resonators by ears mechanically . ( it was an acoustic puzzle because location matter)

By the way i never planned to do that, i make it one by one set of three without even knowing that it was a planned experiment at all i only go behind each small improvement and corrections ...More fun than buying  and we learn how to hear...

Then the improvement of acoustics parameters perception in the late evening is real ...



And kind sir, i missed your comment about the boondocks….. ;-) i’m a dual Condo dweller… i envy your solitude.

I probably missed it but is your system on a single 20 A dedicated circuit w a tightened main panel, verified excellent grounds and a new breaker ? fans and various motors on opposite leg of panel… and no inverters ?….after that…i’m out of bullets…. except for helping drain the flagon…

@tomic601 Honestly I'm embarrassed to say it but no, I don't have a dedicated line to the listening room. It's something I've thought about doing frequently but just haven't gotten around to it. Though....I'm skeptical about the potential benefits. I've done it one other time and heard no difference. But that's not to say it wouldn't improve my current situation.