Your most indispensable "tweak"?

Dedicated Apollo turntable shelf, mass loaded Atacama speaker stands, QED biwire speaker cables, Audioquest NRG power outlet, Niagara conditioner, 20 amp dedicated circuit, AQ thunder power cable. Recently, Origin Live Gravity One record weight, yet to try, but looks interesting.

I run shotgun bi-wire cables with spades to my speakers, but adding jumpers in the banana connections as well significantly improved imaging and tightened bass to the point that I won’t listen without them. 

Upgrading my Power Conditioner from the Niagara 1200 was a huge leap for me.

@builder3
"Take care of your hearing"
Could not agree more. I built a porch on the back of our previous house during the summer of ’05. Circular and chop saw blaring every day that I was off from work. I ended up with tinnitus and still have it today. I think my hearing is okay as a couple of friends agree with what I hear on my system. But I sure wish I could go back to the summer of ’05 and protect my hearing.

So many interesting suggestions!  Thanks all.  And feel free to keep them coming...

@highend666 - thanks for the link, although completely impossible in my listening space

@stringreen - details of your carbon fiber outlet please?

@sjsfiveo - yes, couldn't agree more about NOS tubes

@soix - not sure what these jumpers look like in action -- can you describe more?

@barbapapa - not familiar with PPT -- what does that stand for?

@chrismini - super interesting suggestion

So many isolation/shelving ideas too -- will look into those.  Thanks!