My yammy 663 brings in my "presence speakers" only when I am in "spectacle" mode. And I can dial l them in to 75db with the rest of the system in the set-up menu.. Very nice for (some) movies and ambient music. Its just a bigger sound stage, hard to discern the nature of the added content.
Denon X5200 , Emotiva UPA7, for 7.3.4 ATMOS/DSU
Klipsch FL/FR: F3 , Center: Icon 25 , SL/SR: RC3II , SRL/SRR :Icon 36 Towers, TF & TR: SLX
2 30" BF THTLP'S and SUBMAXIMUS and Inuke6000DSP
SHARP 80" LED/LCD, Xbox1 PS4 Panny BD 220