Behringer dj900usb mixer with laptop and active boxes connect?
What is your question? If it works? Yes, it does. How it goes? Line-ins would be interesting for the laptop and with main-outputs there are ports to output the signal to active speakers.
First of all, thanks for the answer
on the laptop external sound card
at the PAs connectors in chinch and xlr
do I need additional a "source" for the output of the signal?