I was able to get a schematic from Hypex' tech support showing me the correct location to mount the drivers. I was fooled by solder on a couple of posts that said left and right... seemed obvious. The actual location is not as obvious... not marked. Now, the sub is working. I will have a chance to play with the different options over the Holidays so I can figure out what to do... I do like your suggestion to add output plugs ... provides a simple way to activate/deactivate the sub.
The funny thing is that I did get the Ack! DAC delivered but I have not had a chance to play with it yet. Tonight is my girl's Christmas concert at their school. So, stereo stuff will have to wait another day.