Believe it or not, ny best "Bang for the buck" improvement was a $150 USB cable. Almost everything I listen to goes thru that cable. The difference is huge. Try one from Wireworld, Furuteck, or Zavfino.
Best Stereo Upgrade Value
A question for you audiophiles...
What "upgrade/change" has singularly given you the biggest (not incremental) improvement to your stereo system? Upgraded amp, pre-amp, tubes, room correction unit, subs, connectors, cables, speakers, streamer, stylus, speaker placement, acoustic panels, etc.?