Your DAC would require both normal and inverted phase RCA outputs (0 / 180 degrees). You would then need a special balanced interconnect that is terminated at one end with XLR, while the other end will have (4) RCA type connectors. In a balanced system the signal sent via the balanced interconnect cable is sent to both of the internal conductors that make up the cable. One of the conductors is fed a "normal" signal, while the other conductor is fed the same signal (only inverted). The third pin on the XLR is the ground. Without an inverted RCA output in conjunction with a normal RCA output you will not be able to achieve a true balanced signal. With both outputs it's doable and you can find the special cables - http://www.ciaudio.com/
USB DAC balanced or unbalanced inputs?
Can anyone tell me the benefits of running balanced instead of unbalanced (as I am now) when going from my usb dac into my mcintosh mc7300? the unbalanced inputs are rca and the balanced xlr. So, Id be running rca>xlr cable from my dac to the amp. Id love to know what benefits I may get before forking out the $$$ to get a new cable. Thanks in advance.