It's possible to adjust the audio equalizer on NOMVDIC X300. Please follow the below instructions:
Step 1. In the main menu, go to Settings
Step 2. In Settings, go to Advanced Settings
Step 3. In Advanced Settings, scroll down to go to harman/kardon
Step 4. In harman/kardon, Audio Mode > Select User. In User mode, 100Hz, 500Hz, 1500Hz, 5000Hz, and 10000Hz can be adjusted.
If you still have questions, please feel free to contact us at firstname.lastname@example.org.