Hi @Missionsparta 

Thanks for your post!

We did not alter the audio profile of the Arc, so I’m not sure why you are hearing a difference.

You should be able to adjust the relative level of your Era 300s by changing Settings » System » troom with Arc] » Surround Audio » TV Level.

I hope this helps.

I actually ened up leaving for the US holiday, so I'll give it a go when I get home. While I did notice it with TV and Moviesa bit, it was extremely noticeable with music. Before the update  it sounded like the music was coming from everywhere; you couldn't pinpoint a speaker location of you closed your eyes. After rhe update 80% of the music seemed to be coming from the rear 300's. Again, thanks for the advice, and I'll try when I return home.