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Oscar Heil

Dr. Oskar Heil, noted physisist and inventor of the Field Effect Transistor, began his research into loudspeaker design, not with abstract theory of how a loudspeaker should work, but with a study of the peculiarities of the human listening aparatus. The result of this intensive year-long research program led to his discovery of the principle on which the Oskar Air Velocity Transformer is based. By applying this principle to the design of a loudspeaker diaphragm, he was able to achieve a revolutionary breakthrough in solving the fundamental problems of diaphragm mass, inertia and self resonance. In the following, we describe the results of Dr. Heils research and how it led to the development of the Heil Air Motion Transformer speaker.

Oskar A.V.T. ( AMT) Kithara Loudspeaker.
The bass unit is mounted facing upwards to ensure the best phase relaitionship with the high frequency OSKAR A.V.T. ( AMT)

Speaker elements: 1 A.M.T. mid range - tweeter 700 - 23000 Hz
1 25 cm bass unit 28-700 Hz.
28-23000 Hz +- 5 dB
94 dB 1 W 1 meter
4 ohm minimum
oiled walnut, cherry, or black, Maple wood veneer
40 x 40 x 110 cm including A.M.T.
35 Kg.

Syrinx

The Heil A.M.T.® Syrinx is based on the experiences made with the Heil A.M.T.® Kithara and Aulos, which are successfully on the market for over 10 Years. The extensive studies of wood combinations and other acoustical factors have delayed the launching of this speaker for more than one Year. Its modern exterior design comes from TELOS of Berlin, whereas the acoustical refinements to match the sound impressions of the other two models have been made by Precide SA, with the great help of Mieko Dürrenmatt, (my wife) As the other speakers, the Syrinx uses the Heil A.M.T. Made by Precide, which covers the important frequency range from 1000 Hz on up to 23 KHz. The bass driver is a paper cone unit with an inverted dust cap and is working as a bass reflex. The alignment between the bass and the Heil is very phase coherent, as a matter of fact; one could say that it is a point source speaker. The Bass unit faces app. 45° upwards and the Heil driver is located in such a way, that the two units match perfectly. The X over is completely electrically separated, so that bi-wire or bi-amplification does not present any problem at all. The unit comes with pin points and specially made plates, so that the floor will not be damaged. The available wood veneers are: Cherry, Maple and back ash. Warranty is 5 Years and instructions are in four languages, English, German, Italian and French.

Speaker
Elemets:
1 A.M.T. mid range tweeter 1000 - 23000 Hz
  1 15 cm bass unit 40 - 1000 Hz
Frequency response: 40 - 23000 Hz
Sensitivity: 90 dB 1 W 1 meter
Impedance: 4 ohm minimum
Cabinet finish: black maple and cherry
Dimension
including grill:
W x D x H 270 front 105 back x 270 x 910 mm
Weight: 14 Kg.

 

 

 

Oskar A.V.T. ( AMT) Aulos
The bass unit is mounted in a 45° angle to ensure the best phase relaitionship with the high frequency OSKAR A.V.T. ( AMT)

Speaker
Elemets:
1 A.M.T. mid range tweeter 1000 - 23000 Hz
  1 15 cm bass unit 40 - 1500 Hz
Frequency response: 45 - 23000 Hz
Sensitivity: 89 dB 1 W 1 meter
Impedance: 4 ohm minimum
Cabinet finish: Oiled cherry, maple, or black veneer
Dimension
including grill:
23 w x 30 d x 50 h cm
Weight: 8.7 Kg.

Precide SA
via V. Vela 33

CH 6834 Morbio Inf.

Tel: 091 6831734 - 35

Fax: 091 6836679

http://www.precide.ch/eng/eheil/eheil.htm