There are 4 classifications for EVP with Class A recordings being the rarest type.
This type of recording is very clear. People in the immediate vicinity can make out the words used by the spirit and it’s heard with the ear. There is no need to play back the audio. Class A EVPs usually accompany a highly active, intelligent haunting. Ghostly Activities has yet to capture a Class A EVP.
Class B is a more common type of EVP. The investigator may not hear it in real time; it’s heard during audio play back. In most cases, you can make out the words after listening to the data a few times. You shouldn’t have to strain to understand the words. Many times, the Class B EVP is laughter, screams, growls and humming. Ghostly Activities captured Class B EVP at the Congress Hotel and a session with a psychic medium.
Class C EVPs are the most common type of audio evidence. The recording may sound like whispers and it’s hard to understand what’s said by the spirit. You have to use some high-powered audio filters and amplifiers to get something understandable from the data. Ghostly Activities recorded numerous Class C EVPs at the Congress Hotel in Chicago.
We usually debunk most Class D EVPs as background noise. Many times, it’s your mind matrixing the audio. If we can’t make the data out, we generally disregard this type of phenomenon.