Separate Amp for AV receiver

That could be the issue, I'm keeping the Martin Logan though, what do you think about SVS?

I think the ML should stay. Now theoretically you should match that center with a L + R Martin Logan

Are you in a position for that kinda upgrade

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