N.I Trac Z1
I bought TRAKTOR Controller Z1 mostly thinking I could use it as a mixer and for a soundcard whilst I finished saving/paying of some CDJs in a local pawn shop.
I still haven’t used it. I got it from same shop.
The idea being its a good way I can make a quick ref point for where tunes/miss I’m working on sit.
I now have bought some mrh25 5". They don’t support line out. In fact most of the tracktor stuff and N.I up to Audio 4/5 isn’t going to work.
I haven’t heard my speakers yet as I need to run a sound card. ? How do I do this? I’ve got TRACKTOR DJ2 installed.
I could use Mixx audio to. 
https://www.native-instruments.com/en/products/traktor/traktor-for-ios/traktor-kontrol-z1/
https://www.gear4music.com/Recording-and-Computers/Mackie-MR524-5-Powered-Studio-Monitor/22FJ