Separate Amp for AV receiver

Another question can you illustrate the system, example: my system is a 7.1.4

7 mains and surrounds
4 Atmos 
1 subwoofer….i use 4 actually but since the get their signal from one output, i use the number 1, i think saying 4. Isn’t accurate 

I  see you are using two subs so list that as 1 as well

And if you were actually prepared for that kind of a main speaker upgrade, they would def need their own outboard amp, like a 3ch cinenova high current able to control that trio.

Safe And Sound offers the 60xt mains refurbished not bad deal

I would consider the little MLs, the ESLX. I have seven Mains and surrounds, 2 subs, but only one working for now. I may mess around with it tomorrow.