Pioneer Dj DDJ-FLX10 4-Channel DJ Controller for rekordbox and Serato DJ Pro (Black) - Manual (Page 66)

Connections
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• Be sure to use the [BOOTH] output terminals for a balanced output.
If these terminals are connected to an unbalanced input (such as an
RCA or TS terminal) using a TRS to RCA converter cable (or a
converter adapter), TS cable, etc., sound quality may decrease or
unwanted noise may occur.
Connecting
1 Connect your headphones to one of the [PHONES] output
terminals on the unit's front panel.
2 Connect an output device such as a powered amplifier to the
[MASTER 1] output terminals or [MASTER 2] output terminals.
• To output the sound from the [BOOTH] output terminals, connect a device to
use as a booth monitor.
• To use an output device such as a multi player, connect to the [CH3] / [CH4]
input terminals and set the [LINE/PHONO] switch.
3 Connect the unit to your PC/Mac via a USB cable.
4 Turn on your PC/Mac.
5 Connect the AC adapter.
6 Press the [  ] switch on the unit’s rear panel to turn it on.
• For Windows users
The “preparing device” message may appear. In this case, wait until the
“ready-to-use” message appears.
7 Turn on the devices connected to the [MASTER 1] output terminals
and [MASTER 2] output terminals.
• When a microphone, multi player, or other external device is connected to
the input terminals, turn on that device too.