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

Congratulations @m669326 

I hope they make you and you better half very happy.

Just curious, are going to use them just for music or HT or both?

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.