Hello Leo. I think the absent Enhancements tab in your Sound settings is due to a driver issue: specifically because a Realtek audio driver, which exposes no enhancements feature to any Windows version, is installed. If you had noticed that the tab is still there for other sound devices but not SteelSeries GameDAC then this is a strong indication that the Realtek driver applied to the DAC is not compatible with the Enhancements interface built into Windows.
Here precedes the steps to get the Enhancements tab back with only replacing the Realtek audio driver to the default High Definition Audio driver:
- First press Win + R to launch the Run dialog box, type devmgmt.msc and hit Enter to open Device Manager. Expand the menu for Sound, video and game controllers, right-click the Realtek(R) Audio device and select Disable device. Approve any warnings that may appear, but should Windows ask to reboot, select "No" at this time.
- Next, right-click on the same Realtek(R) Audio device previously and click Update Driver. In Windows Update Drivers wizard select “Browse my computer for drivers,” in the next screen select “Let me pick from a list of available drivers on my computer.” Now select High Definition Audio Device from the list, click Next, and approve any warnings that may appear.
- Once you have installed the default driver, go ahead and close Device Manager. Now open the Sound applet. Go to Control Panel > Hardware and Sound > Sound. Click on your SteelSeries device and now select Properties. You should now find the Enhancements tab back and functioning.
Here's the reference: How To Restore Missing Audio Enhancement Tab In Windows
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Best regards,