just found out of fiio q1,it is also a dac,and it can be connected on ur22 since it has line in on fiio,it also has battery build in it 30 h of use,it cost around 50 bucks,still shame i have to use external pre,steinberg made terible mistake calling this interface mk2 since it has no improvement on sound what so ever,ur 22mk2 interface also tested with m50x and ath msr7 ,just low power,i beleve amp inside can go up to 30ohms,which is rly low,