Sansui QR 6500 Brochure

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4-Channel Receiver

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SANSUI QR-6500 4-CHANNEL STEREO RECEIVER This is a
monumental audio achievement-perhaps the most important in Sansuis
long and illustrious history. A combination of the fabulous new Sansui
4-Channel Synthesizer Decoder. a mighty 280 wall control amplifier
and a super-sensitive AM/FM multiplex stereo tuner, the (JR-6500 is
the receiver for the serious audio enthusiast who's ready for awesomely
brilliant mum-dimensional sound field reproduction. This top-of-the-
line 4-channel receiver reproduces as no other can. the intensity. the
vibrance. and the delicate nuances of live performances Close your
eyes and you're transported from your own living room to Carnegie Hall.
the Hollywood Bowl. La ScaIa-wherever your stereo heart calls home.

The most important element of the QR-6500. of course. is the Sansui

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4-Channel Synthesizer Decoder. uniquely able to convert today's
2-channel stereo records. tapes and FM stereo broadcasts into exciting
4-channel sound. And then able to decode 2-channel stereo programs
encoded from four channels back to their original 4-channel format.
Completely electronic with advanced integrated circuits in its 4-channel
synthesizing/decoding matrix. it includes no mechanical time delay or
echo device which might impair the quality of reproduced sound. But the
greatest assets of the Sansui 4-Channel Synthesizer Decoder are its
phase shifter and exclusive phase modulator circuits which process
the rear channel sounds to achieve the sound field phenomenon that
distinguishes live performances. The (JR-6500 4-Channel Stereo Re-
ceiver. Sansuis inspired monument to the world's greatest music.

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4cCHANNEL SYNTHESIZER DECODER SEC-
TION

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FOUR:

This exclusive Sansui device is what enables
the 051650010 convert your valuable collection
of Z-channel stereo records and tapes. as wall
as FM multiplex stereo broadcasts. to exciting
lichannel stereo sound. In addition. working
as a 4-channel decoder. it also separates en~
coded 2-channel programs-records, tapes or
FM stereo broadcasts back to their original 4-
channel form to establish distinct sound images
of original sound sources

FULLY ELECTRONIC:

The 2. to d-channei conversion described above
is achieved completely electronically-without
the use of any mechanical time delay or echo
device-so that the tonal quality of original
saund is not in the least Impaired. When an
ordinary 2-channel program is being converted.
the rear channels will reproduce all the extra.
once dormant sound effects applause of the
audience. echo in the concert hall. and In some
recordings, even certain musical instruments-
sound effects that do so much toward re-creat-
ing the original live performances. The result.
ant 'sound field' effect is quite equal to or. in
many cases. even better than that obtainable
from discrete 4-channel program sources. The
secret is the combined work of the three major
components of the 4-Channel Synthesizer De-
coder-the 4-channei synthesizing/decoding
matrix, phase shifter and phase modulator
circuits.

2 UNIQUE PHASE SHIFTER CIRCUIT:
Included in the synthesizer decoder is a unique
phase shifter circuit that gives the two rear
channels a phase difference of 90 degrees each
«plus 90 degrees to the rear left channel and
minus 90 degrees to the rear right channel,
This puts the rear channels in phase with each
other, and establishes a correct phase relation-
ship among all four channels. creating distinct
sound images of original sound sources.

3 EXCLUSIVE PHASE MODULATOR
CIRCUIT:

The live sound field present in any concert hall
or auditorium at the time of an actual perform-
ance involves an infinite number of interactions
between direct sounds and the innumerable.
multidimensional indirect sounds with their in-

finitesimal phase differences. After the matrix
reorganiaes twochannel signals into four chan-
nels and the two rear channels are 'phase-
shifted' by plus and minus 90 degrees. these two
channels are processed through an exclusive
phase modulator circuit (patents pending).
Here. the signals are continuously phase-moon.
lated and given the same randomly varying
phase differences as are present in the concert

hall at the time oi a live performance. and then
are finally relayed on for reproduction through
the rear left and right speaker systems. When
these meet the direct. unaffected sounds emit-
ted by the front left and right speaker systems.
an astonishingly vibrant sound field is achieved.
very closely approximating the original perform-
ance.

4 ADJUSTS FOR ALL TYPES OF MUSIC:
A simple turn of the 4 position Synthesizer
Selector lets you exploit each kind of music--
whether it be a piano aoloa full orchestral per-
formance. rock or 1322- with maximum effective
ness.

CONCERT HALL-1 : For music that is best ap-
preciated oblectlvely. such as orchestral per
formences of symphonies. Operas. big-band jazz
and combo Jazz Produces a sound field equiva.
lent to the stage of a concert hall In front of the
listener. The 'Front 2-2 System' of speaker
positioning produces the best results.
CONCERT HALL-2; Best suited for music played
by small groups or by individuals. such as
chamber music. solo performances, and vocal
recitals.

SURROUND,DECODER Most appropriate for
popular vocals. "easy listening" music. country
and western, rhythm and blues. and other music
which you feel'. rather than judge. Puts you
In the midst of the musical instruments and
vocalists to envelope you with sound. Set to
this position also when hearing a 4-channel
performance encoded into 2vchanne' form be
it a record, tape or FM multiplex stereo broad-
cast signal.

2-CH.: For regular 2ichannel stereo sound
from the front left and right speaker systems
only.

SYNTHESIZER/DECODER

CONCERT SURIIOUND/DECODEI
HALL- 1

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5 VERSATILE MODE SWITCH:

Set to NORMAL, RIGHT QUARTER TURN. HALF
TURN or LEFT QUARTER TURN position to bring
the front channel sound before you no matter
which direction you may be facing. Each
adlustment turns the sound around by another
90 degrees.

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6 RECORD PLAYBACK. aux TERMINALS:
The Synthesizer Decoder section is equipped
with recent and playback terminals for connect-
ing a 4-channel tape deck. and with 4-channel
AUX terminals to permit the reproduction or
any discrete 4-channel program sources of now
and in the future.

8 23 21 30

7 CONNECTS FIVE PAIRS OF SPEAKER
SYSTEMS:

The QR-6500 can connect no fewer the re
pairs of speaker systems» three for the front
channels and two for the rear channels. Lets
you switch over between the '2-2' and 'Front
22 System of speaker positioning. or install
four speaker systems in each of two rooms in
your home.

8 MASTER BALANCE CONTROL. DIGITAL
MODE INDICATOR:

This great receiver also features an over-all
balance control between the front channels and
the rear channels. It Is both easy to operate
and checli visually. Another convenient feature
is a 2» and Aachannel digital mode indicator
controlled by the Mode SWitch.