Question Dell Precision 7720 makes a rattling / clicking sound when ever I play audio (video)

I would disassemble the laptop and see if any dirt or debris stuck between the diaphragm and the speaker grill/shell. Also, have you tried manually uninstalling the audio drivers from Device Manager and reinstalling with the latest sourced off of Dell's support site using the service tag, in an elevated command? Would be a good idea to also see if your laptop is pending a BIOS update.