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Lansche  Germany

The CORONA "Plasma tweeter" is at the heart of all our speakers.

The fascination of the CORONA Plasma tweeter lies in the hard-to-describe lightness of treble reproduction, linked with an absolutely insane precision and speed, without having to accept even a hint of hardness. The absence of any system-generated resonance in the whole transferred frequency range of 1.5kHz –150kHz is remarkable! No other system is capable of achieving this, regardless of the principle used. The Plasma tweeter’s mode of operation is responsible for this in that the sound is not sent out via a membrane consisting of a fixed material, but rather by the sound-transferring medium; the air itself.

An 8 mm long arc is set up between an extremely small curved annulus in the middle of the combustion chamber and a high voltage outer electrode placed outside the tweeter’s combustion chamber. This arc forms an ionized gas cloud (ion field) which has five times less area and 100,000-times less weight (some weigh as little as atoms) than a fixed membrane. And, of course, the weight of the driver (moving coil) of the membrane should be counted as well because the two form one moving part.)


The music signal itself is modulated and causes all points within the volume of the ion field to be accelerated exactly in unison by changes in the electric field strength. Annoying independent movements which characterize flat ring membrane speakers are plagued by their weight, small band systems or other representatives of the tweeter "old-school", do not occur using this principle. As a result of almost drag free (only the weight of the air) and virtually point-source emission, neither intensity loss nor directional sound can occur in the listening area through interference.

The sound itself is generated in the small ionized airspace by the direct stimulation of the air molecules and spreads out from there serving to increase acoustic adaptation and raising efficiency.

All treble signals are processed within the exactness of the ear faithfully and coherently.

Errors in the amplitudes and phases do not exist. Unwanted noises are above the range of the best amplifiers and well above the available sources of noise.

The CORONA Plasma tweeter has a positive effect on the whole sound picture. Every instrument, thus even, for example, a double bass generates higher frequencies from scratching or striking noises which fall within the range of the Plasma tweeter.

Furthermore an exact reproduction of the relationship contained in the ratio of direct sound to indirect sound can be made due to the group term (relation of phase difference to frequency segment difference) which is extremely low and is constant across the frequency spectrum. This is a basic condition for an exact 3-D sound. Thus the CORONA Plasma tweeter stands apart in all sorts of ways from ordinary converter processes.


With this tweeter we offer the quickest and best treble system in the world by far.

For the mid and bass reproduction alone, where a lot of mass has to be moved, there has been an immense engineering cost to achieve a matching sound reproduction without a time delay between the nearly mass less high tone reproduction and the mass burdened reproduction of the rest of the sound spectrum.

Of course, a similar speed is impossible to reach with a mid range speaker or woofer. The speed of the moving air molecules (and therefore also of the driven membrane) is proportional to the frequency, it takes 100 times less speed to exactly reproduce 100Hz than it does 10kHz. Even so, for a speaker with self weight this still poses an immense challenge.

This problem does not arise in a loudspeaker with a conventional tweeter. Through more sluggish and hence slower transmission of the treble, matching is relatively easy for similarly sluggish action in the mid frequencies, and, more specifically in the bass region.


For those of you still bewildered, here is a simpler explanation:

The Corona tweeter takes advantage of the corona discharge effect to produce sound. This is a similar way as nature produces sound through electricity. Imagine a lightning bolt traversing trough the air. The lighting bolt suddenly heats the air causing it to expand. This expansion creates variations in the surrounding air pressure and creates sound as thunder. The Corona tweeter works the same way; high voltage causes the dielectric breakdown of the air and produces an electric flame. By modulating the Corona tweeter with a very high frequency, sound is produced. This is an ideal situation since no mass is moved to produce the sound; it is emitted by the corona discharge itself. This gives a perfect transient response which no other technology can accomplish.

2008 Aaudio Imports created by dca/dcpr