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STEREOPHONIC
BALANCE AND
ACOUSTIC
C
HARACTE RISTICS
By
connecting
a
high-quality dynamic microphone for
measurement
to
the
SD-1100, stereophonic channel
balance
and
acoustic characteristics
of
the
listening
room can
be
checked
(Fig.
10).
1.
Connect
the
OSCILLATOR OUTPUT TERMINALS of
the SD-1100 to the AUX terminals of the amplifier.
2.Place
the
microphone (impedance: about 50
kO) at
an
equal distance
from
each speaker
as
shown
in Fig.
11.
3.
Connect
the
microphone plug
to
the
MIC jaek
of
the
SD-1100. Set
the FUNCTION SWITCH to WAVEFORM.
4. Set
the OSCILLATOR FREQUENCY CONTROL
to
1K,
and
turn the OSOLLATOR LEVEL CONTROL
clockwise.
5.
Operate
the
stereo system, and
then,
operate
the
lefL
channel speaker
only.
6. Set
the
SWEEP
RANGE SELECTOR
to
l-00
- 1K, and lock
the pattern on the
screen
by turning the
SWEEP
VARI-
ABLE
CONTROL.
7.
Adjustthe amplitude
of
the
waveform
with the
VERTI-
CAL GAIN KNOB.
8.
Select
the LEVEL
METER SWITCH
to
0,
-10,
-20
or
30
for
easier
reading.
Then take a reading
of
the VERT
LEVEL
METER.
9.
Now,
operate
the right-channel
speaker
only.
Take
LEVEL
meter reading.
.0.
If
the
readings obtained
in
steps
8
and
9
are
much
different,
stereo balance
is
not
proper.
In
most
cases,
this
condition can be corrected
with
the amplifier's
balance
control.
.l
1.
For
observing stereo balances over
the whole
audible
frequency spectrum,
set
the OSCILLATOR FREQUENCY
CONTROL KNOB to
SWEEP
AUTO
and observe
the meter.
l-2.
For
meaningful measurements of system
and
room
charac-
teristics,
the
microphone should
be
placed
at
the
usual
listening
place.
NOTES:1.
lf
the
oscillator
output
is
too
high,
the pattern may
be
distorted
or
the speaker may
be damaged.
2.
Do not
turn
the control
knobs
and
switches
from
their
settings
while
observing the patterns and reading
the
level.
SPEAKER SYSTEMS
Y
M ICROPHONE
RIGHT
CHANNE
L
tEr
EOU
i
/
AL
DISTANCE
./
/
,
,
r-r
l-----l
,qi
r#\l
O r\-:zill
L:rt-
;3{
qF
ffihPe:::l
sPEAKERS
E
EJ
E
STEREO
AMPLIFIER
OR
RECEIVER
SPEAKER
SYSTEMS
MICROPHONE
LEFT CHANNEL
ll
Fig.
11
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