The Susvara is 83dB efficient, the LCD4 is 95dB, so MILES away, sorry.....
when we talk about the driving of a headset, in addition to the efficiency value, we must keep in mind the value of the ohm of the headset, because it is the most determining for the power available to listen and drive a headset.
Considering 60 ohms of Susvara and 200 ohm of Lcd4, the same amp if it has 3 watts at 60 ohms, will have less than 1 watt at 200 ohms.
I do not know if you have direct experiences and I would ask you to provide them, for what concerns me, I speak of headphones that I have owned, listened to for a long time and try in various setups.
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