BEST UPGRADE regardless of cost?


Changing my ARC VT100 MKIII for NAGRA VPA's. Like the difference between zipped and unzipped computer data.
jjwa
In my personal audio history, the biggest improvement was when I replaced my Rectilinear III speakers with Thiel 3.6s. Of course, the improvement was expected. The biggest revelation to me was when I replaced my very cheap Monster Cable speaker wire with Audioquest Dragon silver. I had been skeptical that wire makes a difference, but this convinced me.
Cartrdigemans Isolator,
revelatory for $150 - wish I could afford one for all my tables
Si
Well, with if I can answer this differently, if factoring in cost, the most effective upgrade was dedicated lines without a doubt. The cost? Only $400, but sonically worth thousands.