I have only used speakers and have little knowledge of headphones. I am considering purchasing a high quality headphone and running them from my ME24 preamp's power amp outlets. I have found this thread of great interest as I would probably purchase one of the headphones nominated in the thread. Would I be wasting money purchasing a Focal Utopia, Hifiman HE1000 V2, Sony MDR-Z1R or MrSpeakers Ether Flow headphones and running them from a preamps power amp outlets. My preamp has 2 ohms (open loop) output impedance and 10 VRMS output voltage. Most readers of this thread would not have heard of the Australian ME equipment but Currawong may have. I would be using the preamp and headphones with a Mirus Pro DAC.