What one change to your room, system, or setup made the biggest improvement?

Other than components, the things that made the biggest difference were:

Townshend podiums

Quality power cables

Using a laser measuring device to set the distance/angle of my speakers

Gary

Without a doubt, joining this forum and ending up with this

Sound wise:

Besides speakers and components - Went from spikes in cups on a raised wood floor to Herbie’s Threaded Stud Gliders. stopped random room resonance and cleaned up the bass.

Use:

Moved system out of basement quasi cave to den. I listen every day now.

Detached house. Able to play whenever I wan't. Well if the Mrs don't mind :)

@elliottbnewcombjr ,

Gorgeous turntable!

But really, you shouldn't keep your toothbrush and floss on it...