The Audssey is just a room EQ microphone specifically with the technology that marantz and Denon use, but I mean you can probably use it for EQing any home theater system.
That’s why I didn’t purchase without that, I mean the first step once all the speakers are set up is the balancing of the speakers.
the place had an 8012, 8015, and 6014. You would assume even in a showroom you would think balancing is necessary, but maybe if you only use the fronts and center it’s not as mandatory, I don’t know