how can i connect a pa amplifier with two passive speakers and an active sub woofer to my behringer xenyx 1204usb?

[3Bass]

i have a soundtrack sha108usb 220w powered mixer with two passive speakers, and an active subwoofer wich i like to hook up to my behringer xenyx 1204usb. thanks

 

[sidfrgaming]

Combine the input of the amp and subwoofer using a earphone splitter and then connect