Sorry samac, I can’t offer any Freya S impressions, but I’ve been trying to find the specs of the old Freya and compare them with the Freya +. I found them, and a few specs stood out for me, while others were pretty much the same.
With jfet buffer stage:
OG Freya vs +: SNR 110db A weighted vs 120db A weighted
With tube stage:
OG vs +: SNR 100db A weighted vs 115 A weighted
Also, the crosstalk spec is really notable:
OG vs +: >75db vs 85 db, both from 20 - 20kHz
IMHO, 10 to 15db differences are going to be REALLY detectable by ear. The crosstalk numbers are more of an indication of better isolation from channel to channel, perhaps an indication that the Freya + is built to a higher standard or spec than the OG. Which would kind of make sense since it’s $200 more, or around a 28% price increase.
I never had the OG Freya, but the old Saga as mentioned above. The Freya+ has been a revelation. It’s so far above my old mid fi gear(Nad C375BEE, Parasound P5 and Adcom 555SE), and substantially cheaper! They have probably really shaken up the industry.