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thursday, September 7, 1978
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HI-FI ECONOMY -A
FULL-FLEDGED
PIONEER DC POWER-AMP STEREO RECEIVER
WITH 80 WATTS PER CHANNEL,
0.05 THD
U PIONEER
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AMFM STEREO RECEIVER
SX-980
Respite the attractive price of the SX-980, it shares the
same powerful capabilities and advantages of Pioneer's
exciting "DC with a Difference" amplifier design found In
our more expensive models. There are no capacitors In the
negative feedback loop to cause annoying slow downs
in musical response, for instance. The music lover needn't
understand all the technicalities in our amp design to
appreciate what this means to better audio reproduction -the
proof is in the listening. But the technical advantages
are there, nonetheless, and yours to enjoy over long years
of operation. You'll find them In the FMAM tuner section
of this versatile stereo receiver, too. Such as the three
Pioneer-exclusive ICs - the very same as in the best
separate tuner we make to effectively tame overstrong
signals and pull in the weaker ones, all to result in
monitor-quality reproduction. For the newly-designed phono
equalizer we use another IC to help ensure the very lowest
noise, lowest distortion performance in any receiver at this
price. And on the front panel of the SX-980 are two direct
readout power meters for quick visual checking of exactly
how many watts you're feeding to connected speaker
systems, from a tiny 0.01 watt up to and beyond the rated
per channel power output of the SX-980: 80 watts con
tinuous, 8 ohms, 0.05 THD, over the entire 20 - 20,000Hz
audio spectrum. Here are some of the highlights.
Pioneer's "DC with a Difference"
Power Amplifier: Musical Transients
Are Never Compromised
How is the Pioneer DC design
different? There are several key points
to consider before we can answer that.
First is the fact that today's music is
being recorded with studio techniques
and record-pressing equipment that
offer far more dynamic range than ever
before. Especially in the very low fre
quencies. Today's speaker systems, too,
have extraordinarily wide capabilities.
But conventional AC-type amplifiers
cannot handle the wide range because
they use capacitors in their negative
feedback (NFB) loops -the systems
which help cancel or correct distortion
components in the signal you want to
hear. Those NFB capacitors cause tiny
phase delays. So the signals that reach
your speakers are followed, split
seconds later, by out-of-phase "echos"
of themselves. The results are not so
serious if you're willing to settle for
constricted frequency range, poor
transient response and increased TIM
or Transient Intermodulation distortion.
But with today's superior musical
program sources, who's willing to make
yesterday's compromises when it comes
to good listening? Pioneer isn't. That's
why we've removed those phase-delay-causing
NFB-loop capacitors. But we
leave in the capacitors at the input so
that there's no danger of a DC or Direct
Current signal ever burning out your
speaker systems' voice coils. The
Pioneer SX-980 has this "DC with a
Difference" power amp, and the differ
ence is clearly heard over the widest
possible frequency range. The practical
advantages are many:
(1 ) Connected speakers are protected
from DC-caused breakdown.
(2) Tonal quality is not harmed by DC
in any way.
(3) Our use of selected input
capacitors ensures that tonal quality is
maximized at all times.
(4) Low-frequency transient current,
generated inside the preamp section
when the unit is turned on and off, is
eliminated. Noise is entirely avoided.
(5) Musical quality is never threaten
ed when you play warped records,
because the Pioneer design automati
cally cuts out the subsonic "rumble" on
such discs.
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