My current home theater setup bought in December 2020 is as follows
Arc Sound bar Set with 1 x Arc, 1 x Sub 3 and 2 x Era 100 SL.
Which one of the component, a Sub 4 or 2 x Era 300 will make the biggest difference. I dont wish change the current soundbar or Sub 3, as that will hurt my budget.
I use it for watching TV and playing music from streaming services.
