Best $50 I have spent was a recap kit for my speakers.
Then would be the refresh on my pre & power amp.
Spiking my sub
Swapping out the cheap $3 outlet for a $50 one.
My Favorite Tweaks, What is yours?
My favorite tweak is Puron lowering noise floor of my system. Holostage they open my system more, bigger soundstage , improves layering as well ,and made my system more effortless to listen.