Hi
Our headphone amplifiter maximum output current is about 100mA, according to the Ohm theorem R=V/I,you can calculate the headphone’s minimum or maximum impedance in different gain mode.You can see the impedance matching sheet below.
①Note：This minimum impedance value is built on that the digital volume is maximum.It does not mean that it can not apply to the lower impedance.You can also use the lower impedance headphone by reducing the digital volume.In summary,you should not allow the output current exceeds the limited value-100mA,otherwise you may hear the shock-wave noise.
②Note：This does not mean you cannot use the higher impedance headphone to listen to music.The problem is that the loudness may not reach the headphone’s rated.