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Only if you are unwilling to go with Dolby atmos as that's 5.1 maximum quantity of speakers.

Actually the side surrounds in a 5.1 is now 110-120 degrees according to dolbys website diagram in the speaker setup guides. So it's both to the sides and behind. As for 7 channels. Yamaha rxv 685 is previous model and the v6a is the current model