Hey all,   just thought id share this, I have a dell 7420 , windows 11 and had the same problem. Support suggested I disable the WaxMaxx Audio service in services & startup and after a reboot this appears to have worked.  Not sure what functionality Ive lost but so far so good. Their instructions where Disable the WaveMaxx Audio Service Application from the startup.Right Click the TaskBar.Select Task Manager.Click on the Startup Tab.Right click on MaxxWave Audio Service then select disable     I also stopped/disabled the wavesauxiservice and wavessyssvr in the services tab too. So far so good, hope this helps others 
On 12 July, 2021, I have fresh installed Windows 21H1 on my Dell Inspiron-13 7378 with up-to-date drivers. No third-party application is installed except Dell Update. Whenever I play any video or music file on browser or from source file my CPU usage shoots up to 80-100% most of the time. I have just installed drivers from Dell website so re-installing doesn't make sense. I have also used older version but they don't cause such issue but the older drivers have slightly bad quality as compared to latest one. I guess they have improved performance so much that CPU is unable to handle, definitely the problem is in the driver. Please fix this issue ASAP. Realtek Audio Driver Version: 6.0.1.8158 DirectX Diagnostic Report: DxDiag Report  System Information File (.nfo): Sytem Information   
Waves MaxxAudio Very High CPU Usage Whenever Playing Audio