Experiments on sound and resonance phenomenon continue in Ravne’s tunnels

TAG: pyramids Bosnia, the Bosnian pyramids, archaeoacoustics, Civilization of Visoko, pyramids, archeology, artifact, tunnels Ravne, SBRG, SB Research Group

Among  measurements made in this week of January 2012 on electromagnetic phenomena and  emission of sounds and ultrasounds in Ravne’s tunnels, the most fascinating and suggestive experiment was undoubtedly the phenomenon of "resonance" still present in those sections of the tunnels in which  excavations or safety measures haven’t heavily modified the original structure.

The experiment was performed to find out the level of voice frequency producing a sound response in the whole structure.
For this reason, together with our team, we have collaborated  with professional harmonic singers who tried to create resonance within the tunnels.

Undoubtedly while listening to ancient Aramaic singing in an environment of this kind, more than being concerned with a scientific perspective, we have been struck by the suggestion of such an extraordinary moment.
The tunnel, in fact, free from visitors or tourists because of the above mentioned illumination problems, provided an unexpected originality.

The main character of this initiative was our sound engineer, Heikki Savolainen, who masterfully recorded voices, sounds and noises.
The voices of the singers were tracked by using professional equipment with sample rates up to 96,000 hz.

Singer Denise Myriam Cannas while  performing different frequencies of voice

The method of the recordings was mainly based on the air-recording of the voices of the singers by means of stereo microphones Sennheiser . At the same time, the response of the tunnels' resonance was assayed with highly sensitive microphones Hydrophones, placed in the water on the bottom of the tunnels and connected to another recorder (Marantz and Zoom recorders).

In the break between recordings we immediately checked the results on our computer

The sound mirror, provided by the large surface of water, enabled us to evaluate the spectrum response of sound at a very long distance from the source emission.

The first preliminary results were obtained by superimposing the different   recording tracks in the computer; this enabled us to discover that the resonance frequency of the original tunnel is very low, around 74 hz. But equally interesting was the spread of the voice of female singer Denise Myriam Cannas that put a strain on her voice for about two hours.

The experiment took a total of about 3 hours, but the careful observation of the sound tracks will require at least a couple of months of analysis in a professional studio.

Paolo Debertolis - January 20th, 2012



1) Original recording of the song, that was sung in ancient tunnels, by the microphones in the air to test the frequency response performed by singer Denise Myriam Cannas: here.

2) Original recording of part of harmonic singing sung in Ravne’s tunnels. The harmonic singing shook the tunnels for several seconds after the end of the sound. It is a reaction of approximately 20 seconds  which can be listened with high fidelity headphones and NOT with computer speakers. If you use the headphones with a high level of bass sounds, you can catch the response of this vibration very deeply. This vibration of resonance was recorded by Hydrophones placed in water.

Find the track here.

The final record was obtained by superimposing the tracks of microphones placed in the air (Sennheiser), which collected vibrations of the voice of the singer, with those collected in water (Hydrophones) which recordedthe tunnel's sound response .

A brief video summary of the preliminary research, here.

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