After a year of hemming and hawing, I finally pulled the trigger on a Freya to replace a passive 10k volume pot, the Emotive balanced Control Freak. I did not expect to hear much difference other than better channel balance throughout the range.
Boy, was I wrong!
My system is bubbleupnp->Volumio->gen5 USB gungnir mb->Freya->Ncore400 monos-> KEF LS/50s.
Somehow the Freya's passive mode is significantly better than the pot, and I have no explanation. There is a clarity and coherence to the sound that wasn't there before.
The JFET buffer is what I bought this preamp for, and is the clear winner in my mind, bringing more life and air to the music without the coloration of the tubes. I have never experienced such balanced and naturally reproduced sound before. Everything suddenly sounds "right".
I really wish I understood how this is such a massive leap over the cheap 10k pot, but it has transformed my system into a true hifi experience that was obviously held back by one piece of gear.
I'm impressed by this "entry level" preamp. Unfortunately, now I would have to spend many times what I have in order to upgrade further. Happily, I'm happy.