Devialet with waterfall niagara part of surround set

[ogs]

I think you should be able to make this work very nicely with a 200 or 250. Just connect the Niagaras and sub to the Devialet and make necessary adjustments to make 2ch sound great. Then connect the front L+R line out of the Marantz to the analog line in of the Devialet. Set this input as "Pass thru" and this should work. You might have to go back and adjust the level on the "Pass thru" if there is too much or too little sound coming from the Niagaras when you use them in the 5.1 setup (more than the Marantz can adjust ).
If you use the sub with Niagaras in 2ch, lack of SAM won't make a difference.