Among measurements made in middle of January 2012 on electromagnetic phenomena and emission of sounds and ultrasounds in Ravne’s tunnels, the most fascinating and suggestive experiment was without a doubt the phenomenon of “resonance” still present in those sections of tunnels which the excavation or the safety haven’t heavily modified the original structure.
The experiment was performed in order to find out the frequency of the voice that produces a sound response in the whole structure.
For this reason, together with our researchers team we have also collaborated with professional harmonic singers who tried to put the tunnels in resonance.
No doubt to hear singing in ancient Aramaic in an environment of this kind more than to be concerned with a scientific perspective we have been struck by the suggestion of the extraordinary moment.
The tunnel, in fact, empty at this moment by the visitors or tourists for the problems of illumination already explained above, returned to unexpected originality.
The principal character of this moment was our sound engineer, Heikki Savolainen, who recorded masterfully voices, sounds and noises.
The voices of the singers were tracked through the use of professional equipment with sample rates up to 96,000 hz.
The singer Denise Myriam Cannas while was performing different frequencies of voice
The method of the recordings was based mainly on the registration in air of the voices of singers through use of stereo microphones Sennheiser and simultaneously the response of resonance of the tunnels was assayed with highly sensitive microphones Hydrophones, places in the water on the bottom of the tunnels and connected to another recorder (Marantz and Zoom recorders).
In the break between a recording and the other we immediately checked the results on our computer
The mirror sound, provided by the large surface of water, enabled us to evaluate the spectrum response of sound at a very far distance from the source emission.
The first preliminary results were obtained by superimposing in computer the different traces of recordings and this made possible to discover that the resonance frequency of the original tunnel is very low, around to 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 members of SBRG who took part to the experiment
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 the professional study.
January 20th, 2012
Sincere thanks to the Bosnian Foundation of the Pyramid of the Sun and to Dr.Sci. Semir Osmanagić for allowing these studies and for publishing pictures of the Ravne’s tunnels.
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’s about 20 seconds of answer that you can only listen by high fidelity headphones and NOT by computer speakers. If you use the headphones with a large amount of bass, 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 traces of microphones placed in the air (Sennheiser), which collected vibrations of the voice of the singer, with those collected in water (Hydrophones) which recorded sound response of the tunnel.
