If you experience sound issues on your Razer headset such as hissing, static, or buzzing while 7.1 Surround Sound is enabled, perform the following steps to resolve the issue:
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Open Control Panel > Hardware and Sound > Sound.

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Right-click on “Speakers 7.1 Surround Sound” and select “Properties”.

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Go to the “Advanced” tab.
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Uncheck all options under “Exclusive Mode” and “Signal Enhancements”.

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Click “Apply” then “OK”.

The sound quality issues on your Razer headset while using 7.1 Surround Sound should now be resolved.
If there is no sound coming from your Razer headset even if 7.1 Surround Sound is enabled, do the following:
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Go to Settings > System > Sound.
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Ensure "Speakers (7.1 Surround Sound)" is selected as the default output device in the Windows Sound settings.

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Launch the 7.1 Surround Sound software.
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Select the output device where you would like to apply 7.1 Surround Sound on.

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If the issue persists, open Control Panel > Hardware and Sound > Sound.
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Right-click on your output device and select “Properties”.
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Go to the “Advanced” tab.
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Ensure that the selected “Default Format” is within the range that the 7.1 Surround Sound supports.

No sound issue on your Razer headset while using 7.1 Surround Sound should now be fixed.