DISCUSSION: "It only comes out at night". Does anyone else have this experience!?

As long as I'm good and buzzed, it sounds great to me ANY time of day or night!! 😁

I worked at a plant that used 20 megawatts power.  We would use a transformer and run 480V through the plant.  We would see spikes of 600V.  So yes, our grid is not a smooth thing.  Air conditioners are notorious for ground faults.  Dirt in circuits causes "tracking".  You have to have an ultrasonic listening device to hear it.  Variable frequency drives put out very dirty power.  So if one plant does this, think about the community as a whole..  I would go with the difference in the grid as to why your system sounds better.  Surprised someone hasnt come up with a cleaning and regulating device, or I just don't know about it.

I’m not sure of the technical details and how it works but the electric grid is inductive during the day and capacitive at night. More technical minds might be able to shed some light on how that affects audio electronics. 

 I can’t recall what the “technology” is called, but all my equipment is behind a UPS that completely isolates AC output from AC input by reconstituting the AC voltage and sine wave from a bank of DC batteries.

But, I still notice it.

Right. Because your "technology" does not completely isolate. Your batteries are connected to the grid for charging. AC grid noise gets a free ride. A known problem. A member in Singapore has this same problem. He got it for the frequent power outages. He didn't know about it until he started noticing his system sounded better every time the power went out. The solution is a relay that physically disconnects your battery bank from the grid when listening.

Steve Deckert at DECWARE wrote a newsletter a while back and stated that speakers do not sound optimally until they have been running a minimum of 30 minutes....this allows the coils to heat up and expand.

For a long time now I have wondered why my amp and turntable, everything can be on and running, but still there is a lot of improvement the first 20-30 minutes playing music. The voice coil thing makes a lot of sense. Voice coils definitely do heat up. A lot. They can actually smoke and literally burn out. All good machinists know to get precise measurements parts must be cold. Even handling, your fingers can warm a part enough to make it expand. So heat expands the voice coil, reducing the voice coil gap, which since magnetic fields vary as the inverse square of distance wala! everything gets better. 

Brilliant! Thanks!

You're welcome.MC....I've learned alot from your perspective on these threads. I just wish everyone on Audiogon would stick to Hi- Fi talk and take their politics to Facebook where it belongs and keep this Hi -Fi only.