Could you please explain to me how the E09K works when combined with the E07K? I've watched a few youtube videos but knowing very little about audio a lot of it went straight over my head. I am tempted to go down this route if it means my E07K has a purpose.
The E09K is a much more powerful amplifier so can drive higher impedance headphones more easily. It also has a dock for the E07K and E17K so that when connected, they act as DACs and the amplification is taken care of by the E09K.