JVC loudspeakers (Advertisement, Jan. 1979)

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When it comes to speaker design, JVC goes 2969 times further.

Traditionally, speakers are designed and tested by placing a special microphone in front of the speaker, and examining the sound it picks up on an oscilloscope. The oscilloscope pattern is then drawn or photographed for comparison purposes. And, by a tedious trial-and-error process, speaker design engineers try different speaker, crossover and enclosure combinations to express their sound philosophy.

But JVC has put an end to these archaic and time-consuming procedures.

By using a specially-constructed electro-mechanical transport device that creates a field of 2969 microphone positions; then feeding these sound impulses into a computer, then onto a laboratory video screen and onto motion picture film, JVC engineers can actually see what a speaker will sound like ... before they get too far down the line in the design process.

This exclusive JVC development is called Phase Moire ("Mor-ay") Propagation Pattern Technology.

------- These two Phase Moire patterns represent the crossover frequency response of two similar multi-speaker systems. The left-hand pattern was produced by a JVC SK-1000. Its evenly-undulating shapes indicate a smooth transition from one speaker element to another. The turbulent, uneven pattern on the right is typical of a poorly-designed speaker/crossover combination.

How the Phase Moire technology works

The motion picture film produced by the combination of nearly 3000 pickup points, the computer, and high-speed filming of the resulting patterns from the face of the video screen, actually shows how a speaker, crossover network or entire speaker system performs, rather like "sound in action."

It all looks good, but it sounds even better

The SK-1000 is the careful result of Phase Moire Technology and human engineering.

Capable of handling up to 170-watt peaks (85 watts RMS), this extraordinary-sounding, unusually efficient speaker system delivers truly magnificent, rock-solid bass from its 12-inch free-edge woofer and heavy magnet structure. Vocals and midrange are unusually smooth, with a pleasing sense of presence, thanks to our specially-designed 5-inch midrange driver. Clear, crisp brilliant highs are produced with a 1-inch dome tweeter that disperses them evenly within the listening area.

A final note on technology

Once we discovered the technology needed to produce better-performing speaker components and systems, we put it to work to help us build a modestly-proportioned (and priced) speaker system that would come as close as possible to the highest levels of integrity in musical reproduction.

We feel we've succeeded. But all the technology in the world can't fool two of the most sophisticated testing devices known: your ears. And all the words in the world can't really tell you what the SK-1000 really sounds like. So we suggest that you hear what we've been talking about at a JVC dealer.

------MID/TREBLE LEVEL CONTROLS: Phase distortion and power loss are kept minimum.

1" DOME TWEETER: Elastic hemispherical diaphragm permits wide sound dispersion with low distortion.

5" CONE MIDRANGE: Hard surfaced cone and aluminum alloy metal cap for midrange lucidity and tightness.

12" WOOFER: Accepts unusually high power for real-life bass.

JVC -- "We build in what the others leave out."

JVC America Company, Division of US JVC Corp., 58-75 Queens Midtown Expressway, Maspeth, N.Y., USA.

(Source: Audio magazine, Jan 1979 )

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