TOPPING A50 III Headphone Amplifier NFCA Silver - reviews - There is 1 review.

Very nice and "powerful"
Driving a pair of Dan Clark Noire XO with these via the balanced output. These are 13-ish Ohm planar magnetic headphones, so they draw quite a bit of power.
Thought I'd have to buy some expensive headphone amps to drive these, but the A50 III has no issues driving them. The amplifier gets a bit warm at best over long periods of listening with these.

Product also feels nice, it's a sleek slab of aluminum. Quite pretty actually.
And the volume knob is spaced nicely far apart from the headphone jacks so your fingers don't "collide" with the jacks (something many other amps get wrong).