If I understand it correctly, the impedance is only part of the story. Sensitivity also plays a big role in how much amplification a headphone requires. The sensitivity of the 560s is much higher (110 dBSPL) than that of the Tygrs (95 dBSPL). @MazeFrame made a very nice write-up that I’ll link below.
If I did the math correctly, the HD560s lands at 0.316V/0.0026A while the Tygr lands at 3.07V/0.1A.
So, if I am not mistaken, I think that means that the Tygrs are harder to drive than the HD560s
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