Introduction
EVPs are sounds or voices believed to be of paranormal origin, captured on recording devices but not heard during the actual investigation. They can be whispers, words, or even full sentences — but they’re also easy to misinterpret if you don’t handle them carefully.
Types of EVP
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Class A – Clear, understandable words without prompting. Can be heard without explanation.
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Class B – Understandable after being pointed out; may require enhancement.
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Class C – Unclear, heavily distorted, often debated if it’s a voice at all.
Step 1: Preparing Your Audio
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Use the Original File – Never work on a copy of a copy; always enhance from the raw recording.
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Good Headphones – Use closed-back, noise-cancelling headphones for accuracy.
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Quiet Environment – Avoid reviewing in noisy areas where background sounds can be mistaken for EVPs.
Step 2: Scanning for EVP
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Listen in real time, then replay sections with suspected anomalies.
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Look for visual spikes in waveform editors (e.g., Audacity, Adobe Audition).
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Pay attention to moments following questions during EVP sessions.
Step 3: Enhancement Techniques
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Amplify – Boost volume for low-level sounds.
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Noise Reduction – Filter out background hums, wind, or static.
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EQ Adjustment – Raise mid and high frequencies (1–5 kHz) where human speech occurs.
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Compression – Helps balance quiet and loud sounds for easier listening.
Note: Avoid over-processing — heavy filters can create artifacts that sound like voices but aren’t.
Step 4: Validation & Cross-Checking
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Compare the suspected EVP with video to rule out team chatter or environmental sounds.
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See if the sound coincides with other evidence (EMF spike, motion sensor activation).
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Play it for multiple, unbiased listeners before deciding it’s genuine.
Step 5: Documentation
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Log date, time, location, and context of the EVP.
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Include what was being asked (if during a session) and whether it was heard in real time.
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Save both the raw and enhanced versions in your case file.
Pro Tips for EVP Analysis
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Mark and label EVPs in software timelines for easy reference.
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If possible, have two people review the same file separately, then compare notes.
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Never suggest what you think the EVP says before playing it for someone else — let them interpret naturally.
Case Study
During a locked-down session in a former hospital ward, an investigator asked, “Who’s here with us?” Reviewing the audio later, a whisper responded “Michael” about two seconds after the question. Cross-checking video confirmed all investigators were silent at that moment, and an EMF spike was recorded simultaneously — strengthening the case for it being a genuine Class A EVP.
Action Step Before Moving On
In your Ghost Hunting Journal:
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Download Audacity (free) or your preferred audio software.
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Take a short field recording from your phone or recorder and practice enhancing it with noise reduction and EQ adjustments.
Closing
A crisp, well-documented EVP can be one of the most compelling parts of your evidence — but only if you approach it with discipline and objectivity.
In the next lesson, 9.3 – Video Analysis: Spotting Anomalies Without Bias, we’ll turn to the visual side of evidence, covering how to identify genuine anomalies and avoid the traps of pareidolia and over-interpretation.