How do you tell how dirty your power is?

Plugging in something like the PS Audio Harvester will give you visual confirmation that there is noise in your power supply.
If you turn off all appliaces in your home and notice that you are hearing more details which were previously absent you have audible confirmation that there is noise in your power supply.
The other audible difference is in the music which should in most recordings never all have the same volume i.e some instruments must be clearly softer than others.

If your audio system shares power with any other appliance chances are it will be "dirty". The often overlooked solution is to get a dedicated line from your distribution box to your audio system.

There are many "solutions" out there such as:
Regeneration - PS Audio
Balanced Power - BPT
Passive Filters - Shunyata
Transformers - RGPC
Using Shielded and/or Braided Power Cables

Find the ones that works for you.

Tbg,
Thats a question you have to ask the PS Audio people. My understanding of how it works was if there was noise it would blink. I don't use the Harvester anymore as it stopped blinking the moment I plugged in an RGPC. With regards to dynamics, I only noticed the difference after I plugged in the RGPC.