I notice that even when I use the Smart modem and Mesh units on an ethernet backhaul, they still all broadcast on the same Wifi channels. I have always assumed that this causes interference - with my old system of wired Airport expresses, I used to force them to all use non-overlapping channels to avoid interference. I understand that when the Mesh units work as wireless Mesh, they have to use the same channel. 

 

Is there a way of forcing the Spark mesh units to use different non-overlapping channels when wired, or does it not matter so much for these mesh units compared to traditional APs?