Speakers AND Headphones At the Same Time

I have a headphone jack on the front of my computer. Is there any way I can make it so that I can plug in something in the headphone jack and still have the speakers working?

The reason is I have two sets of speakers and I want to use them both (the second set behind me) and have like a quadratic speaker setup but I only have one speaker port.

I know I can use a Y-splitter on the speaker port but I don't have one and the stores are too far away so I don't feel like going right now. I was wondering if there was a setting on my computer that I could change to allow this.

 

Nope, as soon as you plug into your headphone jack, it's going to disable your rear jacks. The only way I know of is using the "Y" cable you referred too.

Thanks!

Shane