Recommendations on an AMP/DAC for Neumann NDH 20

[eXodus]

My father just picked up a pair of Neumann HDH 20 headphones but doesn't have an amp/dac for them. Looking at the specs the impedance is 150 Ohms.

Any recommendations for anyone using this headset? Looking for amp amp/dac combo, no set budget but something that's enough to power these at least.

 

[Phorize]

Nice headphone-great isolation. They look quite sensitive. Any preference on features and price? Check out the topping dx5 for somethimg at $400 or so.

 

[eXodus]

Nice headphone-great isolation. They look quite sensitive. Any preference on features and price?

Budget is max ~$550 CAD, requirements:

- AMP/DAC combo
- Support for USB input
- Support for 1/4 jack input
- Support for 1/4 jack output or 3.5mm jack