http://auphonix.com/bestfilter Microphones are built to get sounds. So whenever a swift blast of air hits it, it gets noticed, too and leads to popping sounds. Plosives such as the letters P, B, T and D are most typically the causes to these pops. A pop filter works by breaking up a blast of air to make sure that what strikes the microphone isn’t too much for it to take. Consequently, you get sharper and crisper vocal recording.