@brunomarcs Are you using fiber at all?
@mclinnguy I would not take the ER out of the chain. I know you are using fiber what FMC & SFP are you using. I was using the entry level stuff you can buy on Amazon then found a deal on the Sonore Optical Module V1 and this was a massive jump in performance, then I upgraded to the V2 and combined with the ER and Stack SL this was another jump in performance and sound quality. Lots of discussions at WBF and Audiophile Style on these subjects. Very knowledgeable people there including the the folks from Uptone and Sonore contribute at both forums.