Welcome to UM,
Evps can not really count as evidence because of these 5 reasons.
Explanation 1: Camcorders and digital voice recorders can easily pick up noises around it from far distances. The devices are not that advance where it would pick up clear, full conversations but it can pick up fragments of conversations or words or portion of words from great distances. For example, I put my digital voice recorder in an old trunk and then put it in my closet, Filled around the box with quilts. Then I put a matress over it and then closed the door. I then closed the bed room. I sang for an hour and when I played back I could pick up fragments of my singing.
Explanation 2: Things happen around us (in a non-paranormal sense) that we aren't aware of because we are distracted. Humans tend to be focus on one thing (I.E. Accidents with people walking into objects or onto traffic has increased because they too busy paying attention to their cells). When people are going to a "spooky" place they are not focusing on certain things. Like for example people talking to themselves or to other people and you didn't hear it at the time but can be with the voice recorder. THe funny thing is people tend to whisper when at "spooky location" and the voice level or even it's tone of voice can be different. Words here could be very easily be you or your friends.
Explanation 3: EVP can easily be tampered with. We (as the viewers) was not there at the time of the recording, we do not know who was there except the people you mentioned (there could be more people), we do not know the voices fully of those people either. Since we weren't there we We do not know if you tampered with the recordings afterwards or used a sound editing program and distorted the sound or added new voices in.
Explanation 4: People make noises while moving, a yawn, a sigh, a grown. I have heard some people claiming their evps
to have a ghost voice but sounded like some one taking a deep breath or was cold.
Explanation 5: You record it on a voice recorder, transfer it to your computer, cut the recording time, then upload it to the youtube and then youtube compresses the video. Each time you change or edit am a recording, you corrupt the original file. When it is some voice recording you can corrupt it further, it can distort noises or add background noises.
Edited by Brian Topp, 31 July 2012 - 11:06 PM.
Warning: I am a skeptic,
Please do not ask me about Oujia Boards, Mrs Cake, Orb photos, Pictures of a ghost which your friend took with his cell, Ghost Radars, Mrs Cake and Franks box/Spirit Box.
P.S I am Serious About Mrs Cake.