Most satisfying system change in 2017?


What was your most satisfying addition or subtraction for your audio system this year?  Looking for changes in gear, set-up, or listening environment.  What floated your audio boat in 2017?
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Knownothing.  
Use online calcs for cabinets and brace brace brace.  Also  all mdf. 1 in for front baffle of woofer cab.  All drivers have their own cabs and are isolated from one another w sorb Otha next, which improved detail tremendously.  
Ill get some images up ASAP. 
Upgraded from Sonos Connect to the Aurender N100H streamer with Tidal, then added the level 3 Holo Audio Spring dac.........oh yeah!