I have never heard a pasive Riaa preamp (like Cary,AES)so don't know
how to compare with the widely used feedback RIAA preamp in vintage
gear that I have lots of.
What differences are there? I would think that with the feedback type
the frequency response would be extended but the dynamic range a
little compressed.
My speakers are Quad ESL 57 and Rauna Leira(heavy cement speakers and
still competitive with the better monitors).
It would be nice to eek out all the resolution I can out of the Quads.
Theyre stong point is in the midrange so maybe all zero feedback would
suit them.

Dennis Selwa