Got the N1 running tonite, with no problems.
Have the three poweramps plugged into the heavy-duty, 12g. extension cord that mounts two (cheap) duplex outlets; that cord is the RH one in both pics and is plugged into the outlet labeled High-Current. System noise is down a bit but still audible within a foot or so of the main-speaker drivers but not audible farther away than that.
Am tempted to make a higher-quality extension cord using the Neotec UPOCC-copper 11g. powercable and AQ Edison duplex outlets, but that's another project.