Why do I need power management if I have a great power cord?

Erik-Squires, nice manifesto! 

Thanks

I will just throw this into the mix. If you take a look at the box that contains your circuit breakers for the house you will probably find that all the lines that run through your house have 12 gauge copper wire. So explain to me why anyone would think that they need 10 gauge or thicker running the last couple of feet from the plug to the amplifier.

@raysmtb1,

Residential homes in the US are 250/125 volts single phase split running a 250 volt branch circuit 2 pole 3 wire is balanced voltage or load.

@bruce19 

Because when you do it, a good audio system sounds better. 
 

How do I know this? I have tried it multiple times on different iterations of my system over the last twenty years or so of my fifty years in pursuit of great sound. You can see my systems under my ID. 

@atmasphere do you have experience with your amps benefiting from using the two example of power conditioning units that you mentioned?

Yes.

@atmasphere great discussion of these two power conditioners.  I wonder 2 things: 

1.  How much load do they add?  To supply a 400W amp does the load (and heat in the room) go up to 800 watts?

To supply a 400W amp the total draw is likely about 475-500 Watts.

2.  Are these expensive high end units able to totally eliminate transformer hum?

Maybe! If the transformer is noisy because there is a 5th harmonic, then yes. If the transformer is noisy because of DC on the AC line, then very likely yes also (although a $50 DC blocker can sort that out). If the transformer is noisy out of its load and/or design, then no.