This is a tuff question because the best updgrade is alwas the weekest link in the system. For some it is speakes for me it was my pre amp I went from a ARsp16 toa asteix clyspo. What a difference.
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.
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