How do i enable surround sound in pulseaudio?

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your laptop only has 2 speakers and a headset jack so it cannot support more than 2 channels of analog audio

Virtual surround for headphones is possible with some audio processing packages

But I would suggest you also check out the Bauer stereophonic-to-binaural DSP plugin in Audacious or XMMS players
If you like how that sounds there is a LADSPA plugin ladspa-bs2b to apply the same audio processing for other audio streams

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