Do you have 5 or 7 speakers? Are you getting sound from 5 speakers or just the front and center? Do you have a sub? I only have 5.1 so am speculating based on what I THINK I have read in the past. If you have only 5, are you getting 5.1 now? Your processor won't do 7.1 but spreads the 5.1 rear/side signal to the back speakers IF you made the proper choices in setting things up. Don't ask me how😀 It should all be in the manual.

James
NC1: 861v8, ID41, 218, 251(to outdoors), DSP8000SEUG, 7200SEC, DSP520 rears, Apple TV, DirecTV, Oppo BD103, QNAP251, Roon
NC2-M7005, Triad Silver Speakers,Acurus Amps

FL1: 861v4, ID40, 218, MS200, DSP8000SEs, DSP7200SEC, DSP5000s, DirecTv, AppleTv, OppoBD103, QNAP469, Roon
FL2: Marantz 7005, 251, M60s,60C,33s, Oppo BDP-93,MS200, Roon