So, I picked one of these up, and I'm seeing the subtle and pretty impressive improvements over my on-board audio. However, the volume level out of the supplied amp is limited and I'd like to plug this into my main receiver to get more power but for some odd reason the phono to phono isn't picking anything up. I have the usual L&R plugged into the back of the board, and when I trail it up to input into the receiver, for some reason nothing is coming out. I'm using analogue cables, and this has DAC of course so what am I missing here? Thanks!