Spent the 2nd half of yesterday pulling out all my spare amps to see what synergizes with the CC (and CO too). Here's a few thoughts, nothing too detailed, I only spent at most an hour per amp. If one set synergized well, the other did too (ie if the CC liked it, the CO did to, vice versa).
Kenzie OG Rev 2 - Excellent synergy with the CC. Surprisingly good synergy. The Kenzie is a very lush, warm SET amp with a moderate soundstage, and overall excellent technical ability. What sets this one back at times is the noise floor. This amp is notoriously fussy with RFI. Thankfully the CC wasn't picking up any noise, and that warm, lush tonality really synergized well with the aggressive CC. I almost brought the amp to work, I enjoyed it so much. But work is an RFI nightmare, and the Kenzie tends to pick it up pretty bad.
LTA MZ2 - Good synergy, but not as good as the Kenzie for my preferences. The MZ2 is a more neutrally tuned OTL that offers better technical ability than the Kenzie, but doesn't synergize as well for me with the CC. I say this because I liked the Kenzie's warmth, which tempered the CC's cooler more aggressive nature. But the MZ2 is also more of a fast and neutral listen. Pair that with a similar fast/neutral headphone, and it's too much. The CC sounded like it was on a solid state amp on the MZ2. Ultra fast, precise, and controlled. The MZ2 easily powered the CC, with great driver control and dynamic range. But that neutrality was just too much for these ears. Amazing amp for the Bokeh and AC though! Synergy is strong with those two. I'll still say good synergy as not everyone is a darkness lover like me, so some will appreciate the pairing.
Woo WA3 - Poor synergy. It's an old school OTL, and is just not meant for power hungry planars. Volume was good, but dynamics lacking significantly. Loose, resonant bass. Piercing highs. Bloated mids. Lacking dynamic range. Classic signs of underpowered performance. Now the 300ohm dynamics on this bad boy is another story. Epic synergy! But for the CC specifically, don't bother.
Asgard 3 - Good synergy, "FOR SOLID STATE". I had to qualify that. I just don't like the CC on solid state. So those who do can disregard that qualification. But for tube lovers needing a solid state option, the Asgard isn't a bad option. It's an inheirently warm and smooth solid state amp with good but not great technical performance. Power is more than adequate. It's just not the most resolving amp out there, especially for solid state. But that's what synergizes well with the CC. That slightly smoothed out and blurred resolution tempers the aggressive CC nicely. Dynamic range is excellent. Under duress it easily handled anything I could torture test it with, never losing it's composure or control of the drivers. And even under duress it's dynamic range remained high.
iFi Zen Can - Good synergy. WITH BASS BOOST! I have an iFi stack of the Zen Dac and Zen Can as a backup system when space is very limited. Very nice sounding combo that's somewhat smoothed over and soft sounding. The Zen Can has one feature I was loving with the CC....BASS BOOST! It made the CC a much thicker, bassier set, which was really fun. And even with the bass boost off the Zen combo was smooth and warm sounding, making this a decent budget solid state option. Plenty of power, with good dynamic range. I think the Asgard 3 amp is more refined and accomplished, but not by a huge margin.
Vali 2+ - Borderline power output makes the V2+ a tough recommendation on the CC. You'll get plenty of volume. Dynamics and technical prowess though are somewhat muted with the V2+/CC combo. I'd pass.
Magni 2 - No! Don't do it. Just don't. I've had this little amp sitting in a drawer for years, often used in tandem with a Modi 2U for TV/Game purposes. So why the big fat no? This little amp is strident with the CC. We're talking some really uncomfortable glare and harshness. Power was borderline. It got loud, but dynamics were compromised. Not as bad as the Vali 2+, but not that that much better. For me personally, i'd rather just not listen at all vs listening on this stack.
So after a lot of amp testing, my current favorite amps for the CC are in order, 1 being best:
1) - DNA Stratus - It's a beast of an amp in all the good ways. Excellent sonics, dynamics, technicalities. Just a top shelf amp giving top shelf sound. Nuff said.
2) - Ampsandsound Kenzie OG Rev 2 - Amazing tonal synergy with the CC. Gives added warmth and smoothness vs the Stratus. But just cannot compete with the Stratus' technical ability or dynamic range.
3) - Hagerman Tuba - This little amp is always surprising me. Like seriously, I should know by now not to doubt it. But I do. And I feel dumb every time for it when the amp outperforms my expectations. I'm cranking the volume dial hard with the CC, but sonically it's a home run. Not as rich and warm as the Kenzie, nor as dynamic and explosive as the Stratus. But the great thing is it walks a middle ground between the two amps above it. It's not as warm as the Kenzie but slightly warmer than the Stratus. It lacks the dynamic range of the Stratus, but has slightly more than the Kenzie. It just sounds good, as it ALWAYS does. This is one of the most versatile and great sounding tube amps out there. Yeah you can get more expensive specialized amps that eat it's lunch, but that's not the point. The Tuba is as flexible as a solid state amp. But with tubes, and tube sonics.
That's it. Outside those three, I'd rather just grab a different headphone. It was a fun weekend with the Calderas. I have been testing them every chance I get, or just plain relaxing and listening.