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I don't see this type of spec on the Xuelin. Is there a specific device you or the community would recommend? Thanks for help this nube.
I'm also curious to know the answer to this.
If you're looking to keep your iPhone as a source, you're basically looking for a portable headphone amp. Fiio makes quite a few that you can look into, and some are DAC/amp combos that bypass the phone's DAC. So long as you choose one of the newer models, there shouldn't be a problem with high output impedance.
If you want to have a dedicated DAP, then you run into the Fiio lineup, iBasso models, and a few more expensive ones. I myself have the iBasso DX50 and DX90 (I really should look into selling the DX50 somewhere...), and both have output impedances less than 1 ohm. To expand on what Mash stated, it's been quoted by a few places that for amps, you should have an output impedance 1/8th of the headphone. Best place I found for info on that topic is at NwAvGuy's blog.
Obviously, there are many more options that you can choose from, and each one is just a little different from the next you find. One of the better resources you can use is Head-Fi, though just be aware that you may run into some bias.