The phase response of mics is primarily related to the transducer principle applied. Regarding modern mics, this concerns either condenser mics or dynamic mics. The starting point is: The condenser (omnidirectional/pressure) mic is in phase with the acoustic signal. The dynamic mic (ribbon or moving coil) is shifted by 90°. All mic diaphragms have a resonance frequency (just like a drum). Resonances may introduce phase shifts. However, the diaphragm resonance is not the only resonating phenomeno