Studio Six Digital makes the very useful app AudioTools. They test all iOS devices to create generic profiles for the built in mics. They’ve found them to be

Studio Six Digital makes the very useful app AudioTools. They test all iOS devices to create generic profiles for the built in mics. They’ve found them to be very consistent which is kind of remarkable for a consumer cell phone device. More info here: https://studiosixdigital.com/audio-hardware/generic-audio-hardware/iphone_3gs_microphone/ https://studiosixdigital.com/audio-hardware/generic-audio-ha...