What are the solder pins on the Dac+ Zero for?

I've noticed that there are two sets of pins on either side of the Dac+ Zero, one on the right and the left. The one on the right is larger and seems to be connected to the audio out directly, but the smaller 3 pin set is labeled L GND R. I'd assume it was another audio out (like I suspect the other one to be) but it seems to be connected to a small resistor circuit. Does this allow me to connect an audio input as passthrough without damaging speakers with double the voltage? It would be very useful for my project. 


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