Need help connecting an extra sub to the audio output while using an interface

[Aromal_Pradeep]

So I recently bought the presonus eris e3.5 and the focusrite scarlett 2i2. But since the speakers lack sub , I decided to use my old creative A255 sub woofer which is really good. But when I connected the focusrite into the lap, the audio output from my lap wont function. I tried changing the output from system sound settings, but still it did not work. Using Asio4all in my daw and turning on both outputs from the control panel also did not work as the sound only came from the interface.

 

Also the creative A255 sub takes info from the right speakers and then sents to the left.

 

So is there anyway to get output from both outlets(lap audio output and from the 2i2) or is there a way to connect my sub without all these work.

 

Also is there a possibility of creating a virtual environment and splitting the audio outputs such that I can use both my interface and laptop audio output jack?

 

Any help is appreciated and thank you.

 

Images :

 

A255 sub back

 

Creative speaker main connections

 

Presonus eris e3.5 left speaker back

 

Interface back