This is what the LCD-3 (102dB SPL/mW sensitivity and 110 Ohms resistance) needs for power (they are quite efficient actually):
To get 120dB peaks (threshold of pain) you only need 63.36mW of power (2.64V and 24mA). Feed them more power and you get more volume which I wouldn’t recommend if you don’t want to destroy your hearing in a few seconds. I suggest that the implementation / tuning / synergy with the upstream gear is more a factor than unused power, and the Hugo2 has plenty of Voltage and Current to drive them. Just keeping it down to Earth rather than recommending spending money on just the power spec of an amp.
Also to add, I don’t buy in to Audeze’s generic marketing claim that they need 1-4W to power them well. The physics make no sense to require 1-4W of power for the LCD-3’s sensitivity at normal listening levels.
Curious, why would you expect the soundstage to be the same between the LCD-2C and the LCD-3? I’m not sure you can expect the LCD-3 to change to match the LCD-2C over a few weeks, regarding soundstage, with burn-in. Disclaimer: I haven’t heard the LCD-2C but I own the LCD-2.2 (pre-fazor).
Thank you. I have neither had the pleasure to experience the Hugo 2 nor the LCD-3. I am sure some might find the paring enjoyable.
"Feed them more power and you get more volume which I wouldn’t recommend if you don’t want to destroy your hearing in a few seconds. I suggest that the implementation / tuning / synergy with the upstream gear is more a factor than unused power, and the Hugo2 has plenty of Voltage and Current to drive them."
Your last comment on synergy basically covers you from the following critique, but it should not be buried by the volume/power requirements listed first. Synergy is essential for achieving a desirable experience, and that is what is ultimately at debate.
Regarding theoretical power requirements: as a long-time HE-6 user, I have been wizened by experience to very seriously throw out the window advice about spl levels vs nominal power requirements for planar headphones. Nominally, the Schiir Lyr 1 was marketed to drive the HE-6, so were several headphone amps, and on paper, they were perfectly capable of doing so, but I have tried this alongside of power amps, and it was just nowhere near in comparison. The HE-6 from the Lyr, let alone any headphone amplifier I've tried, which I should add are usually much more expensive than power amps, sounded horrible, shrill, lacking in bass, claustrophobic, etc. The multi-thousand pages dedicated to amping the HE-6 can attest to the depth of this debate over time.
Just because it says on paper the Hugo 2 can drive the LCD-3, which it sounds like it obviously can, doesn't mean that it will be as enjoyable from an amplifier with cleaner, more powerful amplification. Thankfully, it is less intense of a requirement than the HE-6 and can be driven by a variety of amps. However, I need to experience both to be able to make a definitive claim here.
If you have experience with both, that would be great to counter my suspicion. Maybe the pairing really is excellent!
"Just keeping it down to Earth rather than recommending
spending money on just the power spec of an amp."
Chord products are not cheap. While it is true that I threw out the HeadAmp flagship, also not cheap, one might buy an amp along the $1k or <$1k range that might power the LCD-3 amp better. The issue would then be losing the source, and purity, of a straight Hugo 2 connection. I am using a $200 vintage Bryston 2B to power my HE-6 beautifully, better than what I have heard from multi-thousand dollar headamps. Achieving high-power and headroom is not as expensive as it was years ago.
My bet is that a Bryston BHA-1 paired with a Modi Multibit would be a better pairing with the LCD-3 than the likes of the Hugo 2, while the Hugo 2 would be better with the likes of the Utopia than with the former components.