Wired headphones are generally recommended for DJing since wired headphones have no latency, while most bluetooth headphones have a latency which can disturb the DeeJay operations.
Bluetooth speakers can be used in DJing to play the music for the audience : bluetooth latency is not disturbing for the audience.
Here is a process on Mac OS to use - a bluetooth speaker for the audience, - and wired headphones for the DeeJay preview.
1) Connect the bluetooth speaker to the Mac Go in Preference > Bluetooth and pair the Bluetooth speaker

2) If your audio interface control panel has a menu to set the headphones on the channel 1-2, set the headphones channel on 1-2.

3) Go in Utilities and run Audio MIDI Setup

4) In the Audio MIDI Setup, go to Window Audio devices, and create an aggregate device in clicking on the + button on bottom left

5) In the Aggregate device, add - first, the Bluetooth speaker - second, your audio interface device.


6) Click on Configure Speakers (bottom right of the window) and set: - Aggregate Device as Multichannel: Quadriphonic - Front: channel 1 and 2 - Rear : channel 3 and 4

7) In your DJ software, in the sound setup, set: - Sound Card: Aggregate Device - Outputs Master: Channel 1&2 Headphones: Channel 3&4 
You can now - play your mix on the bluetooth speaker for the audience - preview your mix in your headphones.
Remark: you can 1) neither use the microphone connected to the audio interface, as the microphone input is not connected to the bluetooth speaker, 2) nor use the output 1-2 of your audio interface to play the mix on wired speakers: your master output is your bluetooth speaker, while the output 1-2 of your audio interface plays the preview.
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