I am unsure as to how valid the research in this article is, however it does go along with some of the research i have personally done. I have had the idea that acoustic levitation could very well be possible on a larger scale for some time now by directing the sound waves at a bowl-like crevice that orients the sounds into a cone to hold the object in place. The sounds would would be directed towards this bowl at roughly a 90ยบ angle each equally spaced away from this bowl so that all the frequencies match up properly. When comparing this article to my drawing i find it has a few similarities that stick out like a sore thumb. I could be mistaken but perhaps.
(As taken from the article at
http://www.keelynet.com/davidson/npap1.htm)
Levitation in Ancient Tibet:
Research into ancient religions reveals many startling levitation effects. One of the most detailed and interesting of these have been recorded by a competent witness5.
A Swede, Dr. Jarl, who studied at Oxford became friends with a fellow student from Tibet. Several years later, in 1939, he was asked by his friend to go to Tibet to treat a high Lama. His Tibetan friend had risen to high rank at his Lamasery and Dr. Jarl was privileged to learn many things which most foreigners would never hear about.
On one occasion, his friend took him to a meadow which was surrounded by high cliffs to the northwest. About 250 meters up the face of the cliff there was a hole which looked like the entrance to a cave. A rock wall was being built in front of the cave by Tibetan monks. Access to the cave could only be achieved from the top of the mountain. 250 meters from the face of the cliff, facing the cave, was a polished rock slab with a bowl shaped depression in it. A block of stone, 1.5 meters long by 1 meter wide and 1 meter high was lowered into the depression by a team of Yaks and monks.
Monks with19 musical instruments, consisting of 13 drums and 5 trumpets, were arranged in an arc of 90 degrees (see Figure 3) in front of the stone block. The instruments had the following measurements:
(1). 8 drums were 1 meter diameter X 1.5 meters deep X 3mm sheet iron and weighed 150 kg.
(2). 4 drums were 0.7 meter diameter X 1 meters deep
(3). 1 drum was 0.2 meter diameter X 0.3 meters deep
(4). All trumpets were 3.12 meters X 0.3 meters

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All the drums were open on one end, mounted on poles, and aimed at the block of stone. The drums were beat by monks using a big leather club.
Behind each instrument was a row of monks. The monks started chanting and playing the musical instruments which lasted four minutes.
When the sound reached a certain level the large block of stone placed in front of them, occupying the focal point of the monks formation, majestically floated into the air and arched up to the construction site on the mountain above them where receiving monks guided the large block into place. The flight path of the huge stone took about 3 minutes.
This was not an isolated incident. The monks continued to perform this feat at the rate of 5 or 6 stones per hour. On occasion a stone was broken by the process which indicates that the sonic resonance forces are capable of destructive effects.
Calculations reveal that the volume of the large drums are similar to the stone block volume. The medium drums are one third the volume of the large drum and the small drum is a 41th of the medium drum and 125th of the large drum.
The exact volume of the large stone is not available; however, the harmonic relations of the drums implies it is about 1.5 cubic meters.
As to the trumpets, their length, 3.12 meters, is not a good indicator of its sound. Most trumpets are flared at the end so part of the trumpet is more for sound amplification than its frequency component. So, if the wave length of the trumpet is some harmonic of about 3 meters, then the trumpet produces a sound which is the second harmonic of the large drums (i.e., 3 divided by 1.5 equals 2). Thus we see that the drums and trumpets are all harmonically tuned to the size of the stone being levitated.
Another interesting aspect of this levitation demonstration is the small amount of power necessary to perform the levitation. The loudest tolerable sound pressure that a person can stand is approximately 280 dynes/cm2. From physics analysis9 this translates to about 0.000094 watts/cm2.
If we assume that each monk with his instrument produced one half this much sound energy (which is highly unlikely) and we make the further gross assumption that this is the amount of power that reaches the stone (actually sound dissipates rapidly over distance), we would have about 0.01 watts (i.e., (19 instruments + 19 X 4 monks) X 0.000094) hitting the huge stone block. This is an astoundingly small amount of energy actually hitting the 1.5 cubic meter stone to produce the effect.
To lift the stone 250 meters takes a prodigious amount of energy. Rocks such as granite and limestone have weights in the neighborhood of 150 - 175 pounds per cubic foot.
If we assume a nominal value of 160 pounds per cubic foot then the 1.5 cubic meter stones weighed around 8475 pounds (i.e., over 4 tons!!!). To lift the 8475 pounds 250 meters would require about 7 million ft-pounds of work (i.e., 8475 pounds X 250 meters / 0.30408 meters/foot = 6,968,035).
Since this was done over a 3 minute period then about 70 horsepower was produced (i.e., 7 X 106 foot-pounds / 180 seconds / 550 horsepower/foot- pound/second = 70.384).
This is equivalent to 52 kilowatts (i.e., 70.384 X 0.74570 kilowatts/horsepower = 52.5). The over unity power factor we obtain is 5,250,000 over unity (i.e., 52,500 watts/0.01 watts).
The monks were obviously tapping into a huge amount of free energy to levitate the huge stone blocks or gravity requires little power to effects its operation once the principles are understood.
Movies taken by Dr. Jarl of the levitation were confiscated by the society he worked for and classified. Analysis of the geometric measurements, taken by Dr. Jarl, of the levitation situation reveals that the distances are related to the speed of light and other earth resonance phenomena.