Sansui AU-6500 - STEREO UPGRADES; 4-Channel System Integration; Electronic Crossover Setup

UPGRADING YOUR STEREO
4-Channel Stereo System
The sound we hear daily is a mixture of the sound
that reaches our ears straight from the sound
source—be it a musical instrument, a jet, a man’s
mouth cr what have you—and the ‘indirect sounds’
that arrive at our earsonly after they are reflected
off various surfaces, such as the walls, ceiling and
so forth. Four-channel recordings are made using
two microphones in the front of the concert hall and
two in the rear (to simplify the explanation). The
‘indirect sounds’ with their complicated waveforms
are mainly picked up by the two microphones in the
rear, and reproduced out of the two rear speakers
in a 4-channel stereo set-up for greatly enhanced
‘ambience’ effects. The effect is almost as if the
original live performance were re-played right in
your own room. |
This new approach can now be yours simply by
adding certain equipment—mainly, a Sansui 4-
channel rear amplifier with its unique QS (RM)
synthesizer decoder matrix (patents pending), and a
second pair of speaker systems—to your 2-channel
stereo system. Connection of such a rear amplifier
or 4-channel adaptor is easy. Just connect the 4-
CH ADAPTOR 2-CH OUTPUT terminals of the
AU-6500 with the input terminals of such rear
amplifier or 4-channel adaptor, then connect its 4-
CH ADAPTOR INPUT terminals with the output
terminals of such unit.
To operate the rear amplifier or 4-channel adaptor
so connected, push the 4-Channel Adaptor Switch on
the amplifier’s front panel, and otherwise follow its
manufacturer’s instructions. Electrically, the 4-CH
ADAPTOR 2-CH OUTPUT and INPUT terminals
possess the some functions as the TAPE REC and
MON terminals, respectively.
4-CHANNEL REAR AMP.
4-CHANNEL
ADAPTOR
Electronic Crossover system
The
electronic
crossover
system
affords
these
ad-
vantages:
1.
It
enables
the
tweeters,
midranges
and
woofers
to
be
driven
by
separate
power
amplifiers.
So
you
can
make
optimum
use
of
speakers
of
different
im-
_
pedances
and
efficiencies,
as
well
as
power
amplifiers
of
different
output
capacities
and
tone
qualities.
2.
It
eliminates
the
need
for
the
conventional
LC
type
crossover
network.
With
the
electronic
cross-
over
divider,
the
amplifier’s
damping
factor
is
no
longer
affected
and
you
can
set
crossover
frequencies
as
you
like.
Electronic Crossover System
Using the AU-6500
The
preamplifier
and
power
amplifier
sections
of
the
AU-6500
can
be
disconnected
for
independent
usage,
the
latter
section
being
available
for
driving
a
separate
speaker
in
an
electronic
crossover
system.
To
build
such
a
system,
you
will
need
two-
or
three-
way
speaker
systems
and
an
electronic
crossover
divider,
along
with
at
least
one
or
two
additional
power
amplifiers.
Connection
is
not
all
that
difficult.
First
remove
the
Pre-Main
Connectors
uniting
the
amplifier’s
pre-
amplifier
outputs
and
main
(power)
amplifier
inputs.
Then
just
connect
the
PRE
OUTPUT
to
the
input
terminals
of
the
electronic
crossover
divider,
which
divides
the
input
signals
into
high,
medium
and
low
range(s).
Finally,
couple
the
separate
output
term1-
nals
of
the
electronic
crossover
divider
to
the
ampli-
fier’s
MAIN
INPUT
and
the
additional
power
ampli-
fier(s),
feeding
their
outputs
separately
into
in-
dividual
speakers,
as
illustrated
below.
ELECTRONIC
CROSSOVER
DIVIDER
PROGRAM
70) 8] £69
WOOFER