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.?

bheyamoto

Deviating a bit...the biggest value jump in my Home Theater was replacing the standard cable to my 4K projector with an audiophile power cable. I really could hardly believe what I was missing.

 Just added a Rel Carbon Special sub. Just wow. So much controlled power. Like an AMG v8. Massive overall performance upgrade in my system.