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My question is this: If the Arc Ultra is 9.1.4 by itself what is the configuration/classification if I’ve added two Era 300’s and a Sub?

There’s a discussion on this on Reddit: https://www.reddit.com/r/sonos/s/SZJ9DbjqiD


Hi ​@Jtiger 

Welcome to the Sonos Community!

The short answer is that it is the same - 9.1.4. But, the surrounds aid the Arc Ultra in generating the different channels, giving more immersive results.

I hope this helps.