CREATING THE WORLD'S BEST STEREO SEPARATION WAS AS EASY AS X, Y, Z
If you were asked to describe the performance of your stereo system, you'd rattle off the typical statistics.
Watts per channel. Woofer size. And of course, frequency response.
But chances are, you'd be hard pressed to say how much your cartridge separates the left channel from the right. Yet, of all stereo specifications, none is a better judge of how well your system reproduces music than stereo separation. Because the greater its separation, the more three dimensional your music sounds.
Unfortunately, while other components have improved dramatically every year, cartridges have remained basically the same for twenty. Until now.
AN ACUTEX CARTRIDGE DOESN'T GET ITS SIGNALS CROSSED.
To understand how unique an ACUTEX cartridge is, you have to know something about the common cartridge.
There are two major principles used to convert a record's grooves into electricity. Moving Iron and Moving Magnet.
With the first, the stylus arm, or "cantilever," is made of iron and wiggles near a coil and magnet inside the cartridge. In the second, a tiny magnet attached to the cantilever wiggles near those coils.
Both have drawbacks. A moving iron is a much weaker generator of electricity than a moving magnet. But a moving magnet is much heavier. Its increased weight can wear out your records faster, and might destroy certain high frequency passages at first playing.
Even worse, stereo separation is only fair in either case. Because one iron or one magnet is the source for two channels. But five years ago, some inventor had a brainstorm.
Instead of a single magnet attached to the cantilever, he used two. One for the left (X) and one for the right (Y). Instantly, the cartridge's output rose and stereo separation improved.
It was good, but not good enough.
Since it was heavier. And when (X) wiggled it also caused (Y) to wiggle slightly; causing some left channel signals in the right channel.
There was no barrier to stop that cross talk, and stereo separation suffered.
ACUTEX created the barrier. With basic geometry.
OUR BOTTOM-OF-THE-LINE BEATS THEIR TOP-OF-THE-LINE.
First, we increased output even further by making the cantilever itself magnetic (Z). Thus we had three moving magnets at 90-degree angles to each other; each n a separate plane in relation to the coils.
So when a record played, (Z) canceled out any spurious signals created in he left channel by the right.
And vice versa.
Finally, because we placed one powerful magnet inside the cartridge inducing the magnetism into our three lightweight armatures--the weight was sharply reduced.
The result was stereo separation so great that our $35 model rivals many of our competitors' $135 models.
And the two best ACUTEX cartridges surpass the separation specs all record companies use when cutting an album!
DIAMONDS, GOLD, AND PRECIOUS RECORDS.
Not only will ACUTEX deliver outstanding separation of your music, you'll ear more music to begin with.
Because ACUTEX's three armatures decrease record surface noise at the same moment they increase record signals.
Soft notes especially sound clearer, with minimal snap, crackle, and pop.
Each ACUTEX cartridge was deigned with a diamond stylus best suited or its purpose.
Our 315 model has a solid (nude) elliptical diamond with a frequency response through 31,000 Hertz.
And the 320 provides a ruler-flat response up to 45,000 Hertz, using a recently developed STR (Symmetrical Tri-Radial) diamond.
On all ACUTEX models, the terminal pins are gold-plated. This allows for maximum electrical contact to your other stereo components.
Since we applied the principle of induced magnetism, ACUTEX has a very low Effective Tip Mass. Which means our cartridges are extremely gentle on groove walls, so you can play your oldest and most precious albums without permanent damage.
But frankly, all our words and pictures won't convince you half as much as your ears. One listen, and you'll be convinced hat until now, stereo sound this good was truly unheard of.
ACUTEX will be coming soon to elected hi-fi stores in your area.
(Audio magazine, Jun. 1978)
Also see:
ADC ZLM Improved Series cartridges (Oct. 1979)
ADC XLM phono cartridge (Dec. 1973)
ADC-XT 10 loudspeaker (ad, Sept. 1973)
Adcom Crosscoil (ad, Feb. 1980)
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