One of the most common questions I get is how do you setup your equipment when you go on the road (mobile DJ).  Here is a horrible drawing that might help on how I set up for a small-medium event.  Red lines are POWER

I personally use rekordbox as the software of choice which is why you see the RB-DMX1 DMX controller connected to my laptop via USB on one side and the Donner Wireless connected on the DMX side.  If you use any other software like Serato, Virtual DJ or DeJay AI then the RB-DMX1 won't work for you and you may want to look into the subscription based SoundSwitch.

As a backup to the Donner Wireless not being charged or not working, I just carry two extra DMX cables (1 to run from the RB-DMX1 to the parcan and 1 from the last parcan in the chain to the Gigbar)

I use powered speakers (different ones depending on the size of the gig but ALWAYS powered speakers..  with passive speakers if your one amp goes down you have no sound..  with powered speakers if the amp in the speaker craps out, your other speaker can keep the party going)

If laptop craps out, I carry an iPad Pro with me that I can hook up directly to the DDJ-400

If the DDJ-400 craps out I have two options

1. I can connect the iPad Pro directly into the Mixer and utilize the iOS version of DeJay AI (which I've DJ'd an entire event from iPad Pro to see if I could do it and it worked..  not my go to but as a backup it works great)
2. I can plug my USB from my laptop directly in the Mixer

 

When using Virtual DJ and the Allen & Heath ZED10fx you must configure it like shown below to get deck2 through the headphones on the MacBook

When do I use the ZED10fx?

When I need to plug in lead guitar, bass guitar, drums and a mic