@deep_333 FWIW I was able to drive my HE400S (98dB sensitivity) with an AQ Dragonfly Red. The Sundaras are 92dB but still may be worth a shot if you can return the Dragonfly just in case. Not surprisingly sound quality was significantly improved over using the 3.5mm jack from my iPhone/iPad if that’s your benchmark (I use Qobuz as a source BTW). Incidentally I got a significant bump in performance for not much incremental $$$ by swapping the Apple Camera Adapter for one from LavriCables — very worthwhile upgrade IME. Hope this helps somewhat.
Hifi Man Sundaras!
If you are into treble and can do open back, I highly recommend the Sundaras. I just picked up a pair and am loving them. Just wow! For the $, well worth it. They’re making me strongly consider some magnepans. Does anyone have sundaras and magnepan lrs by any chance?
Anyhow, just great little cans for not much $!
Anyhow, just great little cans for not much $!