Your most indispensable "tweak"?

@stvgray 

That's a great suggestion.  May I ask you about it? 

I assume the electrician used Romex.  Where I live the minimum required Romex is 12/3.  And that's what all the electricians use routinely  if nothing else is specified.  Did you use that, or a lower gauge (thicker wire)?  Also, how long was your run?

Thanks.

@patd33 - essential! 

Caig DeOxit for cleaning, followed by Mapleshade Silclear.
Marigo tuning dots.
Milty Zerostat
Stylast

+1 with atmosphere & mrdecible. The majority mentioned should not be considered a tweek in my opinion.

A tweekers system will always sound better then a plug & play guys system and once you enter the high end hobby everything matters especially entry level not just the super high end.

I agree weed is a good tweek.

George, do you also have PPT "Gate?"
Do you use them together?  What is the strength
of the "box?"  How does it work?