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The impossible dream.
Since 1871 electrostatic speakers have been but a promise; today the Koss Model One has made them a reality.
Unlike most ads, this ad wasn't written for everybody. In truth, it was meant for a very small number of discerning audio enthusiasts who have dreamed an impossible dream about electrostatic speakers. And who have continually been disappointed.
For those who have dreamed the impossible, Koss has developed a full-range electrostatic speaker that reproduces the lowest to the highest octaves of music with an authority never achieved in previous electrostatic speakers. Once you've heard it, we think you'll agree. Until you do, let us tell you why.
First, the Koss Model One isn't another hybrid. The bandpass of 30 Hz to 250 Hz is reproduced by an electro static woofer that features over 19 sq. ft. of diaphragm surface area. No other speaker, electrostatic or dynamic, has ever reproduced the clarity and power of the lowest audible octaves like the Koss Model One. Impossible? Just listen to it.
Second, the Model One represents, to our knowledge, the first 4-way design ever offered in electrostatic speakers.
This design approach has allowed Koss to offer the world's first electrostatic woofer capable of playing at concert hall levels. In addition, a unique midrange panel was designed specifically to avoid the bigger-than-life spacial distortion plaguing other large-panel speakers. In other words, a violin sounds like it is normal-size rather than as big as a cello. The treble and tweeter panel de signs were also critically matched to the wavelength requirements of their respective band-passes. The resulting smooth ness of response and uniform dispersion of energy from top to bottom establishes a new precedent in naturalness and clarity of reproduced sound.
Third, a major design breakthrough has been achieved in the Model One crossover system. And we think it's a uniquely patentable system. Instead of the expected plurality of additional coils, capacitors and resistors normally needed to achieve a 4-way crossover, the Model One uses no other components than those needed to drive the separate acoustic panels. In other words, step-up trans formers which provide the drive voltage to each of the four band-passes also function as the crossovers. This unique transformer design eliminates the need for additional bulky, expensive, distortion-producing components that, until now, made a reasonably-priced but high performance full-range electrostatic system impossible.
Fourth, another innovative design feature of the Model One is the use of a frequency-sensitive attenuator that protects the speaker from unwanted sub-sonic signals below the 30 Hz level as well as potentially dangerous DC voltages from the amplifier.
And fifth, there's a patented Auto-Charge Bias Supply that eliminates the need for an AC cord. Imagine an electro static speaker system without the old "AC umbilical cord"! Or for that matter, without the obvious electrical dangers.
If that isn't worth hearing, what is? Your Audio Specialist will be happy to show you the fulfillment of the electrostatic promise. We don't think you'll be disappointed in what you hear. Nor in what you buy. But then, the Koss Model One isn't for everybody.
Koss Corporation the fulfillment of the electrostatic promise KOSS Model One electrostatic speaker.
KOSS CORPORATION, 4129 N. Port Washington Ave., Milwakuee, Wisconsin 53212, USA.
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(High Fidelity, 1976)
Also see:
Analog and Digital Systems (ADS)