HERE'S A TECHNOLOGY STORY THAT'S TRULY ABSORBING.
Every story has a protagonist and an antagonist. And this one's no different.
The hero, in this case, is an unassuming, little technological breakthrough from Pioneer called the Dynamic Resonance Absorber (DRA).
And the arch-villain, and the ever-present Resonant Tonearm Vibration.
What the Dynamic Resonance Absorber does, to make a long story short, is to absorb the resonant frequency of the tonearms on all of our new turntables.
Thereby eliminating distortion which causes music to lose clarity and accuracy of reproduction.
As if this weren't thrilling enough, there's also an exciting subplot. The DRA eliminates acoustic feedback that results when the turntable is too close to speakers played at high volume.
How the Dynamic Resonance Absorber causes all this to happen is actually quite simple, as most acts of genius usually are.
The DRA is composed of a damper made of extremely dense butyl rubber enclosed in a weighted collar on the tonearm.
Working within the precisely weighted collar, the butyl rubber acts just like a spring. When the pipe of the Polymer Graphite (PG) tonearm vibrates, the "spring" compresses and simultaneously soaks up vibrations.
That's why Pioneer can virtually promise that muddy reproduction is an out-of-date story. And why transient response is far more accurate. In fact, as you can see on the chart, the cartridge output (with DRA) closely resembles the original input.
Furthermore, frequency response, as you can also see, is tremendously flat.
But, while the Dynamic Resonance Absorber is a real blockbuster, it's not the only story here.
Every Pioneer turntable also features a Stable Hanging Rotor' that improves stability by reducing friction which decreases wow and flutter.
A zero-clearance dust cover allows you to place the turntable flush against a wall, yet still open it all the way.
And another convenience item: all controls are located outside the dust cover.
In addition, the PL-S70 (shown here) has two other ease-of-operation features: an automatic disc size selector (ADSS) and auto repeat function.
Naturally, you'll want to audition each new Pioneer turntable with Dynamic Resonance Absorber at your earliest convenience.
If only to convince yourself that this story falls in the non-fiction, not the science-fiction category.
PIONEER---Because the music matters.
(adapted from Audio magazine, Aug. 1983)
= = = =
Also see:
Pioneer PL-630 direct-drive turntable (Dec. 1979)
Pioneer PL-400 turntable (ad, Jul. 1980)
Pioneer SL-518 direct-drive turntable technology (ad, Jan. 1979)
Pioneer Model 510A Direct-Drive Manual Turntable (Equip. Profile, Aug. 1977)