Active And Passive speakers playing the same audio

[IKnowNothin]

Hi There,
I currently own a pair of Canton CT 800s ( Passive) and a pair of JBL LSR 300 ( Active) studio monitors. I'm planning a party and need all the speakers to be playing the same songs at the same time.
From what I've attempted to read and understand, if the amp for the cantons has an aux out it should be fine, but sadly my current one doesn't.
Is there any way to do it by buying an audio interface perhaps?
Any help is appreciated, as you can tell my general knowledge ragging this is limited so go easy on me.
Cheers

 

[joeinid]

Welcome to the forum, thank you for joining.

 

[Speedskater]

Use a wye adapter from the output of your interface, with one leg going to the active speaker and the other leg going to the power amp for the passive speaker.