Have you compared the Cayin to every preamp? There is always something better.
I made a experiement witha Jadis clone, 12AT7, with Mundorf caps, vs a Jadis 20 yr old DPL, Mundorf Caps, Takman Resistors Reys.
Sure Jadis has the finest power caps, Philips the blue ones, but really the improvement was only **miniscule**.
To me a amp = amp\
DAC = DAC
Line Stage = line stage.
Minisclue gains here N there, Now as for
Speakers = speakers
HUge gaps there. Each will sound completely totally differebnt from the next.
Spaekers are everything, the rest is only minisclue gains.
Speakers 90%++ of the sound ina system
the other less than 10% is split between
DAC/CDP /Line Stage/ Amplificatrion.