Fosi Audio K5 Pro Impedance source for the HD550

[JaromAudio]

The acoustic engineer of the Seinheisser HD550 mentioned "please use the HD 550 with low impedance sources since a higher impedance source (higher than 10 Ohm) may introduce some noticeable and unwanted boost to the mid/upper bass region.".

I wanted to know if the Fosi Audio K5 Pro answer that recommendation as I can't find that information.

Thank you.