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For a limited time Dell has the Astro A40 gaming headset with Mix Amp for $199.99. Sale ends on 2/25.
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Dolby Headphone is compatible with native 5.1-channel content. When combined with Dolby Pro Logic II technology, Dolby Headphone can transform content from a two-channel source into a surround sound listening experience.
When reproducing a source that incorporates Dolby Pro Logic IIz preprocessing, Dolby Headphone provides a 7.1-channel surround sound experience.
Dolby Headphone electronically imparts the sonic signature of a corresponding speaker properly placed in a carefully defined acoustic environment to each audio channel (two on stereo programs, and up to five on surround programs). The subwoofer signal (the “.1” Low-Frequency Effects [LFE] channel) is mixed into the Left and Right channels in equal proportion.
All of this information is combined by the Dolby Headphone processor into two encoded channels that deliver the spatial properties of the original audio, with more natural sounds that actually seem to be "out-of-head."