Freeware audio mirroring?

I was looking for a program that would allow me to mirror audio between two devices. For example, I was looking to mirror my headphone audio to my monitor plugged in via DVI. I wanted to show my girlfriend Hellblade, but I feel like the effect would be lost if she couldn't experience the binaural audio.

Any help would be appreciated. Thank you!

You could use Voice Meeter Banana. Allows to map sound to 3 hardware outputs.

To prevent latency, make sure your hardware out use WDM, not MME.