Thread: Surround sound from internet radio and line in problem

I have a Jetway NC62K motherboard with ALC883 onboard audio. I recently ditched the Turtle Beach usb soundcard and switched the onboard audio.
I have my front/rear/sub speakers working fine for mp3s but when listening to online radio like Pandora I only get audio through the front speakers and no bass. Same problem with Line In.
How can I force it to sent the 2 channel audio to all speakers?
Thanks