Ive recently purchased A pair of Flash Cube Speakers/Monitors. THey connect to eachother via bluetooth, however if i plug the RCA cable into one of them, the other speaker will not ghost the sound.

I tried to reroute the RCA cable back into my computer, and connect my computer the speakers Via bluetooth in hopes that my DDJ SB2 would use my computer as a playback device, and then my computer would in turn reroute the sound to the bluetooth speakers.

This is not the case. I can hear everything from my computer being projected from the speakers, EXCEPT my controller. After fiddling around with my audio settings for over an hour, no matter what changes i make, nothing makes the "Line in" from the DDJ SB2 make any noise.

Am i trying the impossible, or am I just going about it wrong?

SPEC:
DDJ SB2
My computer is an Asus ROG laptop, however it only has 1 audio input/output