Most satisfying system change in 2017?

@asp307 

My upgrades were all spaced out, just different things as I could afford or find them. But evaluating each change at a time was a step in the right direction for my tastes.

Nordost Heimdal xlr and silver shadow digital( aes and bnc)
Very open and detailed sound, not lean as some have described but every system will give different results

In all honesty EVERYTHING was a big deal this year.
Lets see
Discovered streaming and Tidal via Bluesound Vault 2...check
Replaced my McIntosh preamp with Exogal Comet Plus DAC/Pre..check
Replaced my old Focal speakers with Wilson Witt series1...check
Replaced all interconnects with Nordost ones, speaker cables with Analysis Plus Oval 9....check
Replaced fuses with SR Black....check
Replaced my Clearaudio tt with one I have lusted over for years, a Nottingham Analogue Spacedeck cw Shelter 501 mk3 cart

Just hard to pick a winner here!
Time to sit back and enjoy the music

Exogal comet plus DAC/preamp and subsequent insertion of sr black fuse!
Woah!
Then just last week I built a new rack using 2 inch maple blocks which surprisingly made another large difference.