How to "Sum" L+R signals for a mono sub output?

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The output of my DAC has a left and right balanced output. I'd like to create 1 or 2 summed (L+R) mono outputs for use with subwoofers without degrading the signals.

Ideally I'll add this into my DAC chassis and add two additional mono XLR outputs for subwoofers. The low-pass filtering is done at the subs.

I'm currently planning on using the schematic in figure 3 from Rane: http://www.rane.com/note109.html

Is this the very best way to accomplish this?
 
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