FWIW synergy and enhancing the strengths should be the goal with such a highly resolving system. Since I own an Esoteric C-03/ A-03 I know the house sound, when adding a different brand extreme caution is needed. Logic would be try the Classe preamp first then Esoteric.
Need a big favor picking a preamp
I recently tried out an Esoteric E-02 phonostage and have decided to buy one. (It was a big step up from a Parasound JC3+, which surprised me.) I'm working on my preamp stage now, and tried out a Dan D'Angostino Momentum HD preamp and the Exoteric Grandioso C1X
Dan's preamp was fantasic, but I makes me feel like I need to be wearing several gold chains when using it. Perhaps also a toupee and some gold nugget rings. "Gaudy" is the word when I look at it.
I also tried out a Esoteric Grandioso C1X, which was fantastic, but a bit cold, and much of my system is already Esoteric Grandioso, and it's getting a bit fanboyish. Unfortunately I did not have it when I tried out the E-02, but I assume the two would be excellent together.
I would say the D'Angostino preamp is "more musical", while the Esoteric more "more precise".
There's a third contender I have never heard on my system, but loved when I heard elsewhere on a similar system -- Nagra HD preamp -- it had the precision of the Esoteric and had just a tad bit of tube sound. It's also startlingly expensive.
I tried out several others that just didn't fit my system: Pass Labs being one, which surprised me.
So, please advise:
D'Angostino Momentum?
Esoteric C1X
Nagra HD
The downstream are two Classe Delta Monoblocks, Bowers 800s, SVS PB16 ultras. Upstream Digital: Esoteric K-03XD and Lumin U1 Upstream Analog: Esoteric E-02 and alternating between a VPI Titan and Esoteric Grandioso turntable.
Current preamp is a Prima Luna Evo 400, which I love the looks of, and punches WAY above its weight for the price, but it's time to go.