I recently purchased a JBL 1300 mk2 with 11 channels. OOTB on bazzite, connected through rtx 3090 HDMI 2.1 > c5 passthrough mode > earc it seems like both the 5.1 and 7.1 channels are set up wrong but in different ways. 5.1 is close but sub sound comes out of both the sub and center channel.

Does anyone have experience with a similar setup? I think I sound be able to remap the channels but I've not had time to play with it. It seems like easyeffects might be able to help but then again most of what I've read looks target at headphones? Anyone have suggestions on how to get the most out of this or set up something similar to atmos? Will passthrough mean atmos content just works?

Thanks