Bought a TPA 3152 amp board on Ebay and it has inputs I'm not familiar with ..it has (in-a) (gnd) and ( in-b ) the only inputs pins I have used in the past RCA for inputting from a usb DAC from my Laptop...how would I connect a RCA ouput from the DAC to these inputs? the amp page is here I'm not that Technical:http://www.3e-audio.com/amplifier/tpa3251-2ch-140w/ ..thanks for any help with this