I’m about to push the button to get 2 SVS 3000 micros to add to ATC SCM40s.

my motivation is music, but the TV is routed through the amp and the speakers, so we’ll see what happens there. As I said before, my wife doesn’t like low rumbling and big explosions sounds and such, so it could be that we will turn them off when we watch movies. I have a feeling that she thinks she doesn’t like that, but  when she hears things through the subs, she’ll realize that there’s a good version of those lower frequencies that she’s never experienced. We will see. 
 

A question to posters on this thread: in what order did you play around with the variables in order to integrate? I’ve got a line on a couple of things to do right away, and then after that it’s a mystery to me about what to do on the SVS app to get the sound dialed in. 

The first thing I did was use REW and measured several places in my room to find the proper placement. Then I did the same with the second one to get them both to cover what they could at my listening chair.

Next, in regards to the app settings, I started with the cross over in order to meld them with my towers, adjusted the volume level (this is a personal taste) and left the phase settings alone. Phase can be adjusted based on several factors and its a rabbit hole I never understood but its based on placement (side wall, back wall) and frequency compared to your mains. I hope someone can give you a better explanation in simple terms incase you want to tackle it. I turned off all the other enhancements (EQ, room gain etc.) because it made them boomy and muddy (again, personal preference). The only thing I use the app for now is the volume once and a while.

Sunshadow, thank you. I appreciate your help.

Jump on it ASAP!!