I have sb4000 and these are a smaller sb16 ultra the app is very good,
the only thing I wished it had is full Auto room Bass correction like on the JL audio Fathom line , the app does many adjustments , ifyou want you can buy a usb Mike
anddownload the REW bass program and just practice and learn it ,Svs will even help with Thst just down load reading from the REW program and they will tell you exact where room peaks are to adjust from your tablet ,or phone app.I have mine dialed-in pretty good , it-was a noticeable step up from theSB 3000 sub ,
and you get a45 audition period of the sub ,they will pay freight both ways if not happy, 5 year transferrable warranty , a very respectable company to deal with.
they have sales, a a overstock dept you can save hundreds,ifyou buy 2
get extra off, and repeat customer an additional5% off ,great warranty and customer service