My app samples the various inputs available on the iPhone and iPad and performs a frequency analysis. In addition to using the internal accelerometer and gyroscope I can also sample the microphone and USB input devices such as accelerometers through the audio input subsystem. The highest sample rate I use with the microphone and USB devices is the 48 KHz of the audio sampling subsystem. This provides a bandwidth of 24 kHz (Nyquist frequency) on the sampled signal. This has worked for many generations of iPhone and iPad until now. When I use my iPhone 14 Pro there is a sharp frequency cutoff at about 8 kHz. I see an artifact at the same frequency when I use the simulators. BUT when I use my 11" iPad Pro, or my current generation iPhone SE I do not see this effect and get good data out to 24 kHz. The iPad Pro does show some rolloff near 24 kHz which is noticeable but not a problem for most applications. The rolloff at 8 kHz is a serious problem for my customers who are testing equipment vibration and noise. I am wondering if this is related to the new microphone options "Standard", "Voice Isolation", and "Wide Spectrum". But if so, why only on the iPhone 14Pro and the simulators? I have searched the documentation but apparently it is not possible to programmatically change the microphone mode and the Apple documentation on how to use this new feature is lacking. I am using AVAudioSession and AVAudioRecorder methods to acquire the data through the audio capture hardware. This code has been working well for me for over 10 years so I do not think it is a code problem but it could be a configuration problem because of new hardware in the iPhone 14 although I have not found anything in the documentation. Examples from various devices and a simulator are shown below for microphone. Does anyone have an idea what may be causing this problem? iPhoneSE 3rd Gen iPad Gen 9 iPad Pro 11in iPhone 14Pro iPad 10th Generation Simulator