Portable DSD/DAC Headphone Amp for iPhone?

I have Sennheiser HD800 and Beyerdynamic Amiron headphones. What is your recommendation for the best combo DSD/DAC headphone amp out there? I want use my iPhone X as my hi res DSD playback device using the currently installed Onkyo HF Player app. It plays DSD ( .DFF and .DSF) files.  * Must be able to convert at native DSD or hi res PCM (96 /24 or higher) resolution. * Must be truly portable. Ie. Battery powered/chargeable. 
Is there such a plug and play portable converter amp? If so what’s the cat’s meow? Money no object. 



Showing 1 response by rocketroom

These are both excellent replies... thank you both! I’ll do some more research and report back here!