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The 3D positional audio is handled by C-Media's Xear3D technology. Xear 3D is a software solution combining Sensaura3D and two other API's. It is not a hardware solution, but it gets the job done. Sensaura provides the HRTF 3D ear fooling, while the other two API's, EnvironmentFX and C-Media Xear 3D Filter, provide some interesting reverb and mixing effects. The 3D filter is a 5.1 channel API, converting 5.1 channel on stereo speakers (or headphones), and expanding 2 channels to 5.1.
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