@mashif Same experience for me. I auditioned the SCM20P (the P is for Passive) with a Benchmark AHB2 and then switched to a Rogue Audio Dragon hybrid. In both cases it was extremely balanced and clean. The SCM20 really shows the character of the amplifier being used, and of course the rest of the chain behind it.
I ended up not buying them because I wanted to compare with the active versions, but could not get a demo at the time. I have a hunch those are better than the passives even with good amplification. Will revisit that later when I can find a set to try out.