Hi there,
If I understand correctly, you will buy an audio interface to stream audio from your laptop to your monitors, later monitors & sub and then the whole sound system and a ddjsx.
So: 1) Audio interface & Monitors
Its the most simple, you have outputs from the Scralet 2i4
You connect the right channel output to the right monitor and the left channel output to the left monitor.
2) Audio interface, Monitors & Sub
Here the sub will act as a relay to your monitors
At the back of it, you have the input channels, you will connect those to the scarlet's output. Then you connect the sub output channels to the monitors inputs and you're good.
3) And for your DDJ-SX, I presume Serato DJ can allow you to choose the scarlet as the master output (its a midi controller so the mixer should be in the software) so you wont have to use more cables to root your audio.
Hope I was clear enough ^^
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