Popping and sibilance:
Popping occurs when words containing P’s & B’s (like popping and barbecue) are sung or spoken Try saying “popping” or “barbecue” with your hand directly in front of your mouth. You will feel the extra burst of air when saying these words compared to words without P’s or B’s. When using a microphone to capture vocals the burst of air will head straight for the unprotected microphone and can cause overload distortions in the mic and associated electronics.
   Sibilance is the excessive hissing when pronouncing S’s and Z’s. Sally sells seashells by the seashore is a phrase that would emphasize sibilance. Sibilance can also overload an unprotected microphone and associated electronics.