Small budget :

https://www.sweetwater.com/store/detail/HP4E--akg-hp4e-4-ch-headphone-amplifier

Medium budget:

https://www.sweetwater.com/store/detail/CAN22H--cranborne-audio-n22h-headphone-amp-and-cast-breakout-box

Those two look good, your ears will adjust to either amp and you can then make your listening decisions.

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