Devialet with waterfall niagara part of surround set

[Simi]

I have a 220PROCI connected to front channel output of Denon AVR 3400H (200W). I find that the channel level balance with my rear speakers is fine. When I had a D120, I had to apply +3dB on the Passthru to balance the volume levels.
I only ever adjust the VRMS of my preout/subwoofer output.

Really? No change on the Devi 220 to match volume for center and rear on the denon side? What are your level setting on the Denon?
I try to attach some Printscreens
Devi_Speaker_Settings Relative level = 0
Devi_Line_Settings Pass thru = -10
Devon_Level_Settings Front = +12

If I go up at Devi_Line_Settings Pass thru to -5 or even 0, result is a permanent, very quiet but audible noise on the fronts, as soon as the Denon powerd up.