Sheep
I think the picture shows the Yamaha lots of detail of dust? Well that looked good enough it’s a whole lot better than my £49.99 pound ViviCam 3785 which can’t focus unlike most other digital cameras.
Have you placed pink noise a steady wideband pink noise with say a, test disc? You should really use matching loudspeakers for the surrounds sidewalls and back wall arrays and even thou there positions are going to be in different positions the tone should sound 99% with a little EQ here to bring it even closer.
The nearer you sit to the rear centre back surrounds the frequency response changes in relation to the sidewall surround array, but how many people sit on top of there surrounds?
Here’s a little experiment you can try out you. Buy yourself an affordable audio mixer and send all the main primary channels to the mixers inputs LCR and surrounds and use just one output from the mixer going to an amplifier and a single loudspeaker.
Set the channels up using wideband pink noise to test and set each channel with the same SPL db while looking at the SPL metre, once set-up with equal balance, play the automatic pink noise sequencer from the AVR.
You should here a seamless and indistinguishable sound, you wouldn’t be able to tell if it’s the left centre surround the right, yes confusing is what it would be. Give it a try you might start wondering and might have a few questions on your mind.