good discussion on power cords

Grease is required by code where I live on main feed aluminum wire. Other than that I don’t see any reason to make a mess in the box with grease. If it’s an outdoor panel a little dielectric grease might be a good idea to help against corrosion on connections. Good video in the OP though a bit long.

Yes, Groucho is pointing out memory is fallible and we tend to remember what we want in a way that pleases us.

Aural memory is no more accurate than visual memory. Yes we can associate certain feelings with aural stimuli just as with visual but those memories are filtered through our biases and emotions. 

There is no problem. 

This is what Hanson said. As long as the power cord gets the current to the power supply it's doing its job, he's not talking about the freaking cord. It doesn't matter if it costs $1 or $1000.

When you understand how an amplifier works—that you're making a copy of the signal by modulating the power supply—then you see that the power supply directly drives the speaker. Anything that's not right about the power supply is going straight into the speakers. That's why we use such a huge power supply—take off the lid and you'll see that about 90% of the innards are the power supply. We have a giant transformer, stacks of chokes, and all those filter capacitors to regulate the front-end. Compared to the audio circuitry, whether you're looking at board-space or cost, that stuff represents 80-90% of the design.