I’ve owned the Audience Hidden Treasure, which is supposed be identical to the Cardas outlet.
I have cryoed Oyaide R0 outlets and an SR Blue outlet.
Oyaide R0 has more midrange body than the Audience and SR Blue.
R0 is more relaxed.
Cardas is silver with a layer of rhodium. Not surprisingly that it’s rhodium plated, I can always hear the rhodium sound.
Ultimately both the Audience/Cardas and SR Blue are lean sounding compared to the Oyaide R0.