The amp/dac you linked does not have an rca output if that is what you are using. It only outputs the dac with the 3.5mm on the rear of the unit. A word of caution, the 3.5mm is a LINE out and not controlled by the volume pot. Thus if you plug in powered monitors it will play at full volume and has the potential to damage your speakers… Trust me, I know. The music you hear is probably just leaked from the internals of the amp. I highly recommend using a pre-amp with that Dac output to prevent you damaging your new speakers. I recommend monoprice 3.5mm to rca cables, I’ve bought cheaper ones and they are just crap