hi, i have the hifiman he400se, which are 25 ohm and 91db.

i had the u-phoria um2 interface but when it got closed to the max volume, i started to hear a distortion and it ruined my listening experience
and now im looking for a new interface on budget that can give them a decent volume and of-course without distortion.

which interface (on a budget if possible) can satisfy my needs?
(also old/expensive ones are relevant because i search also in the 2nd hand market)