Magico S1/S5 back wall proximity

[Mike]

Does anyone know how close the Magico S1/S5 can go to the back wall (since they are not rear ported)?

 

[BlueFox]

I have been reading about the S5 since I have a speaker upgrade itch. Anyway, I seem to remember reading a review where they talked about setting up the S5s for the room, and they ended up with the front of the speaker 6' from the wall behind.

 

[Elberoth]

In my room they are 3' from the wall behind (back to back).