Decent product
I bought an S9 pro dac, the construction is poor, sound is ok, a little sharp depending of the headphones. Separation and soundstage is ok too. Consumes quite fast the battery of ur phone if used as the source. With mi Dan Clark Aeon Noires connected to my iphone makes a lit of clipping, so its not very good handling medium power hungry headphones. Im not so happy with my purchase.