4 Directional Audio

Hi guys, right now I'm trying to work on a game that would utilize multi channel to give the user a 4 directional audio experience. Right now I'm just using Unities 3D audio with a source and a listener that moves to get the audio to play only in the left channel or only in the right channel (Because after hours of looking into the scripting I couldn't figure out how to just change the stereo pan with a script). Is there a way I can use 3D audio to make a sound come only from a speaker in front of the player (as well as the back)? Or will I need to sync up two machines and have them both coordinating left-right speakers to simulate 4 separate channels?

Thanks for the help in advance!