A spirit box works by repeatedly scanning AM or FM radio frequencies. Its speaker plays short pieces of the signals it receives, mixed with noise. Investigators ask questions and listen for words that seem relevant. The scanning is a real radio function; interpreting a sound as a reply from a spirit is a separate claim.
If you have heard a surprisingly clear word in a sweep recording, start by asking where the audio could have come from. Knowing how the receiver works makes the session easier to understand—and helps you choose equipment without expecting it to do more than it can.
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What happens inside a spirit box?
- The receiver tunes to a frequency. It may pick up speech, music, other broadcast content or noise.
- The sweep moves to another frequency. Instead of staying on one station, the device continues through a sequence.
- The speaker plays the changing audio. Brief fragments can sound like syllables, words or incomplete sentences.
- The cycle continues. Available bands, speed settings and scan directions depend on the model.
For examples of the actual controls, see the SB7 product documentation and GhostStop SBox documentation. Their listed radio functions are useful specifications; paranormal explanations in sales copy should not be treated as demonstrated results.
Where do the voices come from?
A radio receiver can receive human speech from broadcasts. A sweep may catch only part of a word, while a strong station may remain recognizable across nearby tuning steps. Hearing speech therefore does not, by itself, show that the source is unusual.
Context also affects interpretation. If someone announces “I heard a name,” the next listener knows what to listen for. A useful check is to play an unlabelled clip to another person and ask them to write down what they hear before sharing your interpretation. Keep disagreements in the record.
Do not turn an unclear sound into a definite quotation. “Possible word, uncertain” is more useful than a confident transcript that the recording cannot support.
What do speed, direction and band change?
- Sweep speed: changing how long the receiver spends at each step changes the fragments you hear. Record the setting rather than assuming one speed is universally best.
- Direction: reverse scanning changes the order of frequencies. It does not play recorded speech backward.
- AM or FM: each band contains different signals. Switching bands changes the audio source as well as the sound.
- Antenna controls: these can change reception. They do not guarantee that all broadcasts are excluded.
GhostStop specifically notes that the SBox 2 antenna-bypass function does not block every broadcast. That matters when evaluating a claim that a word “could not have come from radio.” See the antenna-bypass notes in the manufacturer’s instructions.
Spirit box, audio recorder or phone app?
These can produce recordings through different methods. A conventional audio recorder captures sound through its microphone or audio input. A sweeping spirit box adds changing radio audio to the session. A phone app may use recorded sounds, streamed audio or another method described by its developer.
Check how the specific tool produces sound. A matching name or screen design does not make an app equivalent to a physical radio scanner. The Spirit Box in Phasmophobia is a game mechanic; its rules are not instructions for real equipment.
A practical way to record a session
- Make a short test first. Check power, playback and storage before going to a location.
- Record ordinary conditions. Note nearby radios, conversations, equipment and recognizable stations.
- Log your setup. Include the model, band, sweep setting, antenna setting and location of microphones.
- Ask one question at a time. Leave a consistent listening interval and record it. Avoid talking over the output.
- Keep the full session. Save questions, quiet periods, unclear clips and apparent matches, not just highlights.
- Review without prompts. Compare independent notes before deciding on a transcript.
These steps improve documentation; they do not establish a method of contacting spirits. Keep an untouched original whenever you edit or filter a copy of a recording.
Document timing and the source of the audio
A timing interval in milliseconds usually describes the time spent at a tuning step. A smaller interval means faster stepping, but the frequency step size also affects how quickly a receiver crosses the band. Record both controls when your model offers them; do not assume identical numbers on different devices produce the same sweep.
Some products use stored audio or generated noise instead of live radio reception. Record which sound source is active, the app or device version, effects and any interruptions. Removing live broadcasts does not establish a paranormal source: source material, processing and listening expectations still need consideration.
A repeatable review checklist
- Preserve the full original recording, including the baseline and unanswered questions.
- Compare apparent words with nearby broadcasts, room sounds and handling noise.
- Ask independent listeners what they hear before supplying a transcript.
- Check whether the apparent word is audible in the unprocessed recording.
- Log setting changes, recording interruptions and competing explanations.
For practical audio connections and controls, use the spirit box setup guide. For the difference between recording sound and interpreting it, read EVP session meaning and limitations and what an EVP recorder records. These guides describe documentation tasks, not validated methods of contacting spirits.
What should you look for when buying?
Choose controls you can operate and a recording method you understand. If a device records its own sweep, check whether it also captures your spoken questions in that mode. An external microphone recording and a direct recording of the radio output are different records of the session.
Compare the P-SB7 and SBox, check our spirit box price guide, or browse digital recorders if your main goal is audio documentation.
Common questions
Does a spirit box prove ghosts are present?
No. A relevant-sounding word does not identify its source. Broadcast speech, nearby sounds, interpretation and coincidence still need to be considered.
Does a faster sweep remove radio voices?
It changes the fragments you hear, but it does not establish that remaining speech is non-radio audio. Keep the speed setting in your notes and compare recordings made under controlled conditions.
Do I need complete darkness?
No. Darkness is not required for radio scanning. Keep enough light to move safely and operate your equipment.
Compare spirit boxes and their listed features → New to the equipment? Read the Start Here guide.
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