The Topping EX5 is a good match, if you have more cash the SMSL stack DO/HO200 is excellent.Any recommendation? I was looking at something like the Topping DX3 Pro+ but I'm not sure if it performs well with low-impedance headphones (I understand the Deva Pro has 18 Ohm). Alternatives are the Topping L30/D30 stack or the recently announced SMSL SH-6/SU-6 stack (didn't find yet reviews of the amp, but the DAC seems solid).
If you want to wait for a review I am awaiting the SH/SU-6 stack but it will be about a month till I am finished.
My EX5 review
https://www.hxosplus.gr/reviews/topping-ex5-review/
The SMSL stack
https://www.head-fi.org/showcase/smsl-do200.25534/review/27207/
https://www.head-fi.org/showcase/smsl-ho200.25426/review/27016/
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