Open WaveMaxx Audio app and disable all Mic enhancements .  if same issue comes, Skip Dell driver and use Microsoft  Device manager > Sound > Realtek > Right click > update >> Choose manually and Choose High defination drivers.   
Since I upgraded to Windows 11, having problems with low microphone volume using the intel smart digital array microphone.  I am confirmed to be on the latest dell drivers (Intel - 10.29.0.6040 from 7/7/2021 and Realtek High Definition Audio Driver - 6.0.9313.1 from 4/14/2022).  I have repeatedly run Dell Update and Dell SupportAssist to confirm that no newer drivers are available. I have gone through all settings in windows 11.  In windows 11 settings, I have the input volume set to 100%.  When I 'start test' and speak in a strong voice (louder than I normally speak), it only gets to 26% of total volume.  I am directly in front of the microphone with my face about 18 inches from the microphone.  (Note: by microphone, I mean the integrated microphone).  I have run windows troubleshooters and no issues found. I have repeated the tests using a headset in the side jack.  Same results. This is most problematic when using Microsoft Teams but also can show up when using Zoom. I appreciate any additional guidance and advice that can be offered.  Thank you.  
Inspiron 5502 - low volume with intel smart digital array microphone