Realtek equalizer comes along with Realtek sound card in your Windows 10 computer and should work only if the Realtek High Definition Audio driver has been installed.
You can go to Realtek equalizer settings window to make proper adjustments for Windows 10 audio.
Realtek sound card features a graphic equalizer to let users freely adjust the computer sound. What is Realtek equalizer in Windows 10 and how to open and adjust its settings or troubleshoot its issues? Check the answers in this post. This post from MiniTool Software teaches you how to how to open Realtek equalizer in Windows 10 and adjust Realtek audio equalizer settings, how to fix Realtek equalizer missing or not working issues, etc. The Realtek equalizer Windows 10 controls the Realtek HD sound.