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Oskar Heil Headphones
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Natural music listening at its very best.
Heil ERGO AMT $1100.00
ERGO AMP.1 $400.00
In developing the ERGO Headphones an extensive study of the human anatomy and acoustical properties of the ear and head was considered essential to the total design process. These studies showed that there was no purpose in the ERGO design to follow the herd by developing just an other headphone.
To achieve high quality, distortion-free music reproduction and maximum user comfort, with absence of listener fatigue, a headphone of unconventional design was the only solution.
A) The ERGO headphone rests lightly on top of the head, the weight, mere ounces, distributed over a large insensitive surface. This light weight and soft foam headband cushion result in complete freedom of pressure and allow the scalp to "breathe" naturally.
B) A foam strip, at the rear of each speaker panel, rests lightly behind each ear. These do not contact the ears to cause any deformation, which would obstruct the natural soundfield created by the speakers.
C) The speaker panels are fixed in the correct position to maintain optimum vertical and horizontal angles of sound dispersion.
D) Since the speaker panels do not physically contact the ears, the intervening spaces permit a fresh air-flow from below the ears, which avoids the heat, perspiration and listener fatigue so commonly experienced with conventional headphones. Conventional headphones distort the shape of the outer ear and pump sound directly into the auditory canal depriving the ear of its natural function. Such headphones may have a wide frequency response, but by contacting and deforming the ear they lose or distort the second (indirect) soundwave information resulting in unnatural sound reproduction and listener fatigue.

In addition, by pressing the ears against the head or enclosing them completely, conventional headphones cause discomfort by closing off the free circulation of air around the ears, i.e. nature’s heat exchange system. ERGO headphones reproduce sounds, in a manner quite unlike other headphones free of colouration or distortion, clean and natural. Their unique quality of design and construction ensure sounds superior to that of many speakers on the market. With ERGO headphones, you can listen to music

for extended periods of time without being conscious of wearing headphones and without the usual fatigue associated with conventional headphones.
The ERGO model 1 and 2 utilize rugged and reliable dynamic-type reproducers. Both models can be connected directly to the standard 6.3 mm (or optional 3.5mm) headphone sockets of a stereo amplifier, receiver, tape deck, CD player, TV and PC.

The ERGO 1 is equipped with two dynamic drivers with thin membrane diaphragms. Thanks to the correct acoustical placement of the drive units the sound is clear and

uncoloured. The high quality sound and reasonable price of the ERGO 1 surprises everyone.

The ERGO 2is also equipped with two dynamic speakers which employ neodymium magnets even thinner membranes to reduce distortion to a minimum. The result is sound reproduction which is open, transparant and uncoloured, it approaches that of an electrostatic system.
The ERGO A.M.T employs a completely new drive unit, an Air Motion Transformer.

The Membrane works with a transformation of 5:1, i.e. the air movement is 5 x greater than the movement of the membrane. The unfolded membrane is 175 x 88 mm large. These drivers are manufactured by Precide to meet the highest quality standards, based on the Theory of Dr. Oskar Heil. The most remarkable feature of the AMT Speaker units is the extremely fast reaction to impulses, this ensures correct phase relationships and excellent fine dynamics as well as finest frequency variations. You can detect details in the music, which simply cannot be reproduced with other systems.
The unit has to be connected to the speaker output of a power amplifier with the adaptor box, which allows you to switch between headphone and speakers.Or you can purchase with the AMT headphone the dedicated AMP1 ERGO headphone amplifier, which will also work with any dynamic headphone as well. The efficiency is very high and the impedance is 3 ohms through the bandwidth. Go to Air Motion Transformer to learn more about this fenomenal speaker system.

further Information about the concept of ERGO headphones
Prices in Switzerland in SFR
The ERGO AMP 1 has been specially designed for the ERGO AMT headphone,

ERGO Amp 1 hedphone amplifier electrical datas
(rms. 4 Ohm)… 3. Watt
input sensitivity:
200 mV für 3. Watt out
input impedance:
20 dB
20 - 20 kHz +/- 1 dB
output impedance:
2 - 600 Ohms
W 200 x D 180 x H 70mm
weight (w/o adapter)
1.1 Kg.
230 AC input / 13 VAC 0.5 Amp.

The perceived sound information is divided by the "Anthelix" into two parts. The first part is going directly, from the edge of the "Anthelix", into the auditory canal. The other part of the sound information is diverted to the entrance of the "Helixtunnel" then follows through this tunnel and only

then will it reach the auditory canal. The distance of this soundwave is appr. 66 mm. or 0.2 milliseconds time delay. Everyone can convince himself, by obstructing the way of the 2nd sound-wave with his fingers.
This experiment confirms the theory of the two soundwaves. The test has been done in the following way: A square-wave of 0.14 milliseconds has been reproduced through a loudspeaker placed 90 degrees on the side to the test object. A mini-microphone, which does not obstruct Helix the edge of the auditory canal, has been placed into the different models. The first, direct sound-wave remains the same with all the models. The 2nd, indirect soundwave however, changes dramatically from the models to the natural ears, in which the 2nd soundwave is also very pronounced. (nearly as strong as the 1st sound-wave.)


The intensity of the first, direct sound-wave changes depending on the angle of dispersion of the sound, with the 2nd indirect soundwave, this change is much more marked. The ideal angle of sound dispersion should therefore be between 45 and 90 degrees.
By watching people with a defect in hearing one can notice that they turn their head to the source in such a way that they can receive the soundwaves in the optimal angle. i.e. between 45-90 degrees.

The reception of sound originating 30 degrees over the edge of the auditory canal shows the second information as quite flat, where as with reception of sound originating 45 degrees below the edge of the auditory canal, shows a sharp peak, different from each persons ear. The displacement of the indirect 2nd sound-wave in time delay is a factor, also the intensity and form of the 2nd soundwave changes dramatically. The optimal angle of dispersion of sound should be between the two (30° above and 45° below)


The sound passes through the auditory canal and then reaches the eardrumm. Here the mechanical charge is transfered with the "hammer", "anvil" and "stirrup" to the inner ear "snail". The auditory nerves or "palpate cells" are distributed in the following manner in the inner ear. Near the larger opening we find the auditory nerves for the high frequencies and at the end the ones for the low frequency. Herewith, one can explain, why an overload of the ear, with low frequencies will damage the hearing of high frequencies first