Pioneer Dj DDJ-200 SmDJ Controller for WeDJ and rekordbox - Manual (Page 107)

edjing Mix for iOS
107
En
Connecting an audio device (speaker) to the
headphones jack of your iOS device
You can DJ with an iOS device and listen to your performance via its
built-in speakers. However, if you use the supplied split cable, you can
create an authentic DJ set-up with an external speaker(s) and
headphones.
Connection example 1 (if the iOS device has a headphones
output)
In this example, the master sound plays in stereo and there is no sound
output to the headphones.

Read more: Checking audio setup (page 111)
(1) Speaker with built-in amplifier, etc.*
* The audio cable is not supplied with the unit.
(1)