Use whichever digital output your laptop has, USB or optical or coaxial, to connect to a DAC,
then connect the DACs analog output (3.5mm or RCA) to the analog input (RCA) on the E09K.
I'm I making sense?
The FiiO D3 and D5 are low cost DAC (around $30)
He is a very decent DAC (ELE EL-D01) for $14.95
http://www.ebay.com/itm/290908894610?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Here is a very decent DAC that also has a headphone amplifier (ELE EL-D02), $18.99.
http://www.ebay.com/itm/261217969183?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Here is one sold in the USA (Illinois) for $9.81
http://www.ebay.com/itm/111481508028?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT