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I am looking to connect two pairs of Era 300's to my Arc Ultra & Sub 4 for a complete 5.1 surround sound , is this even possible???

 

No. 


The Arc Ultra provides the 3 front channels. A single pair of Eras as surrounds gives you the 5.x, and of course the Sub makes up the .1 creating a 5.1 system. There’s no option for more speakers. 


If you go beyond the old 5.1 sound and look at Atmos and the Ultra gives you 9.1.4 and adding a pair of 300s gives six more channels each in the rear.