Hi,
As far as I am concerned I bought the Aune x7S.
Was thinking that it may be a product that looks nice but has terrrible inside make.
But this review was quite reassuring
I bought it from seller in Netherlands and got it shipped to France.
It is fed by it's sibbling the Aune x8 DAC.
Which is itself fed by computer using Linux and Sayonara Player.
I've set it to "medium" gain...
All I can say is it feeds my Hifiman DEVA easily and also my Oppo PM-1 with no problems.
Of course those are not really difficult to drive.
Despite the lower impedance, I did not notice any distorsion but of course both being planar magnetic, that may explain.
I am more than happy with the combo and would like to say that I am even considering the S Series from Aune (S6 Pro) to replace x8 and x7s...
Not sure if it will perform better, but you know...
Regards.