Best Portable DAC amp for Mobile use for DT1990

What’s the best way to drive the DT1990 in a portable Dac/Amp for mobile use? Budget $600 or under, Thanks.

probably a topping NX4 or IFI Hipdac since they seem to do 250 ohm headphones well

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Xduoo XD-05 plus works very well as well.

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