Sansui QS-500 - Page 9

TO ENJOY 4-CHANNEL STEREO AT ITS BEST
The 4-channel stereo system far excels the conven-
tional 2-channel system in its capability to faithfully
reproduce the sound field normally present at any
live performance.
Your QS-500 incorporates a OS decoding matrix to
re-organize ordinary two-channel stereo signals to
four channels and establish clear sound images of the
musical instruments and singers, as well as Sansui’s
exclusive phase-modulator circuit to lend the sound
field the liveliness or presence of the original sound
field.
The end effect is so exciting and enthralling that
many audio experts the world over have termed it
purely revolutionary. It is particularly outstanding
when the instrument is used to reproduce four-
channel programs encoded into two channels by
the Sansui 4-Channel Encoder.
To enjoy such 4-channel stereo sound at its best,
you should be familiar with certain basic facts about
the position of the speaker systems and so forth.
Speaker System Positions
The position of the four speaker systems in a 4-
channel stereo system is an essential consideration
if you are to enjoy 4-channel stereo sound at its best,
and it is very important that you place them appro-
priately to suit the type of program source you wish
to hear.
Two basic positions will be discussed below, but you
are free to adapt them to the particular conditions
—-both acoustic and physical—of your room for opti-
mum 4-channel stereo effects.
1) 2-2 System
This is the 4-corner position that is widely accepted
as the ‘standard’ for 4-channel stereo. While it is
particularly fit for use when hearing material en-
coded by the Sansui 4-
Channel Encoder, it is
equally effective for these
types of material: mood
music, popular music,
contemporary music, Mo-
og sound, rhythm and :
blues, musicals, and live |
recordings.
REAR
SPEAKER
2) Front 2-2 System
This system moves the rear speaker systems up
front as shown below and creates a sound field—
the equivalent of a con-
cert hall stage—in front eee
of the listener. It is suit- =
able for those types of
material which more or
less require an objective
attitude of the audience,
such as: symphonies,
operas, chamber music,
modern jazz and big band
=N-RONT EE
~ SPEAKER
REAR |
/ SPEAKER
Jazz.
3) Others
Variations of the above two systems are possible,
and you are absolutely free to devise one to suit the
particular conditions of your room.
Selecting Rear Speaker Systems
Needless to say, the best 4-channel stereo effect will
be realized by using identical speaker systems for
both the front and rear channels. But Sansui’s OS
system of 4-channel stereo is designed so that com-
pact systems, are quite sufficient for use for the rear
channels, allowing your QS-500 to produce more
than satisfactory 4-channel stereo sound.
The speaker systems, however, should be able to
reproduce sound with natural tonal quality and not
affected in one way or another.