LBK1220 Can I add a wired extender into a concrete room where WiFi is weak?

[Bogeyboy]

I have a LBK1220 wireless mesh system in our house.  It works great with one exception.  We built a theater room in an area under our garage.  The room is primarily concrete foundation walls.  The WiFi signal is sporadic in this room.  And of course we are streaming content in the room. When we built the home we ran cat6 cable to the equipment closet in the room. Can  I use the cat6 cable to run the signal from my switch to an extender of some sort in the concrete theater room?  I would like to stay on the same WiFi network if possible. 

[wilbo666]

Did you ever find a solution to this?

I am also trying to find out if say an RBR10 can be added to the mesh network of an RBR1020 as found in the LBK1220 kit vis ethernet backhaul!...