Your most indispensable "tweak"?

@facten

Annual ear wax removal

I was going to say that too -- hahahahahahaha

Yeah, there's been some good humor vibes in this thread. 

The Townshend Podium for my speakers have been well worth it.  

My $49 Bosch laser measuring tool.  Another AGonger mentioned it (thanks).  Fastest way to get your speakers to "disappear". Check distances, seating position, aim for sure but toe in and tilt too.  An inch matters.  Really.  

Cabling you can afford but not crazy.  

Been said before, ear protection for all loud activities. This is a life time hobby.  

Quantum Resonation Conditioner