Viawave Ribbon tweeter
Perfection for perfectionists. Viawave Ribbon tweeter.
A ribbon loudspeaker has two wonderful characteristics. First, the diaphragm radiates sound over its entire surface, extending the operating range well into the ultrasonic range. Second, the ribbon is a virtually weightless sound transducer. For example, the mass of a 7-micrometer-thick aluminum ribbon is equal to the one-and-a-half-centimeter-thick layer of air in front of the ribbon. Because of these characteristics, the ribbon driver can reproduce the finest nuances of sound and add extraordinary realism to the musical image.
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In 1924, Erwin Gerlach and Walter Schottky invented the ribbon loudspeaker, which belongs to the group of electrodynamic loudspeakers. In the ribbon loudspeaker, a conductive membrane (ribbon) is located between two poles of permanent magnets. The current flowing through the ribbon causes the ribbon in the magnetic gap to vibrate and emit sound waves. A transformer is built into the speaker to match the ribbon resistance of tens of milliohms to the output impedance of the amplifier. The Ribbon belt vibrates to radiate sound in both directions, so the radiation must be "recycled" from the "rear" side of the membrane. For this purpose, there is a back chamber behind the belt. If the necessary measures are not taken, the sound entering the chamber can also be re-radiated, since the weightless band is not a barrier in its path. The "mix" of direct and reflected radiation colors the sound and can negate the benefits of the ribbon loudspeaker. Therefore, the greatest attention must be paid to the design of the backbox.