Best Stereo Upgrade Value

Everything

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

acoustic treatments

Given that I have excellent speakers, the amp (integrated) probably made the most difference but the DAC then continued the changes further. I spent twice as much on the DAC as the amp.  I think in most systems the DAC is a fertile ground for improvment.

Jerry

I’d have to say it’s  the subwoofers that did  it for me. I’m running two subs but I purchased them one at a time. When I added the first one I was WOWED. And then when I added the second one it was close to having the same effect on me as I had when I heard the first one by itself. Two subwoofers really do make a big difference at all volume levels.