Technics SB-G920 User manual

YS Ad.
Pe erie areata rrr OD a JEN OF EA PON WEY
‘Technics
Hi-Fi SPEAKER SYSTEM
SB-G920
OPERATING INSTRUCTIONS
Before operating this speaker system, please read these
instructions completely. YS fod

Operating Instructions |
Thank you for selecting the Technics
Hi-Fi
Speaker
System
SB-G920.
To
ob-
tain
maximum
satisfaction
from
all
of
its
many features as well as the longest
possible service, be sure to first read
these instructions carefully.
The
sound
reproduced
by
a
speaker
system
is
easily
influenced
by
such
factors
as
room
acoustics
and
the
place
where
it
is
placed
in
the
room.
Before
final-
ly
deciding
upon
the
place
where
the
speaker
sys-
tems
are’
to
be
placed,
please
carefully
read
the
fol-
lowing
information.
e
In
general,
if
a
speaker
system
is
placed
on
the
floor,
near
a
corner
or
near
a
wall,
the
level
of
the
bass
sound
will
be
increased
by
the
reflections
of
the
sounds
from
the
wall
and
floor.
Consequent-
ly,
itis
possible
to
adjust
the
bass
sound
to
some
extent
by
changing
the
distance
between
the
Speaker
systems
and
the
wall
and/or
floor.
Deter-
mine
the
location
of
the
speaker
systems
which
gives
the
best
sound
reproduction,
therefore,
depending
upon
the
actual
conditions
of
the
room
in
which
they
are
to
be
used.
e
Ifthespeaker
system
faces
toward
a
hard
wallora
glass
door
or
window,
it
is
recommended
that
curtains
or
similar
material
be
used
in
order
to
prevent
undesirable
resonance
and
sound
reflec-
tion,
especially
of
the
treble
sound.
e
Vibrations
from
the
speaker
systems
may
be
transmitted
to
a
record
player,
causing
acoustic
feedback
(“howling”).
For
best
results,
the
speaker
systems
should
not
be
placed
near
the
record
player,
and
should
never
be
placed
on
the
same
table
or
shelf
as
the
record
player.
Itis
often
very
effective,
in
order
to
prevent
“howling”,
to
place
a
thick
piece
of
felt
beneath
the
speaker
systems
and
the
record
player.
¢
Be
sure
to
turn
off
the
power
of
the
amplifier
before
connecting
the
speaker
systems
to
it.
°¢
The
impedance
ofthis
speaker
system
is
8
ohms.
Be
sure
that
the
load
impedance
of
the
amplifier
to
be
used
is
4
~
16
ohms.
¢
The
input
terminals
of
this
unit
are
on
the
rear
surface
of
the
enclosure.
The
polarity
(+
and
ad
|
of
each
input
terminal
is
indicated.
When
connecting
speaker
wires
from
the
amplifier,
be
sure
that
the
left
and
right
connections
and
the
pius
and
minus
connections
are
made
correctly.
e
When
speaker
connection
wires
are
connected
to
the
terminals,
make
the
connections
as
shown
in
Fig.
1.
¢ Speaker cords ranging from standard size to
extra large size can be connected to the input
terminals
of
this
unit,
and
can
be
connected
from
the
top
or
bottom.
Tighten
the
terminals
firmly
before use.
Be
sure
that
the
core
wires
don’t
touch
each
other.
The power-handling capacity of this unit is indicated
in the specifications, and is determined according to
the temperature increase of the voice coils.
e If the amplifier to be used has an output power
which exceeds the power-handling capacity of
this unit, be sure that the amplifier’s volume con-
trol is set so that excessive input is not applied to
the speaker system.
e Even if the amplifier to be used has an output
power which is less than the power-handling
capacity of this unit, the output of the amplifier
will become distorted and excessive input will be
applied to the speaker units, especially for the
middle and high frequencies, if the input signals
to the amplifier are too large or the amplifier
volume level is too high. Also note that higher-
than-normal power is applied to the speaker
systems if the tone controls of an amplifier or a
frequency equalizer are used to raise the level of
bass and/or treble sounds. When adjusting the
volume level, therefore, do so with great care:
confirming that amplifier output is not distorted.
e The power-handling capacity of this unit is set for
reproduction of ordinary music. If an oscillator or
test record is used to produce a continuous signal
such as a sinusoidal wave, etc., a signal
exceeding 2 watts must never be applied.
e Usually, 1 watt of sine wave is enough to test a
speaker system when an oscillator or test disc is
used.
e lf the following special types of signals are
applied to the speaker system, be sure to reduce
the volume level of the amplifier.
1. Interstation hiss on the FM broadcast band.
2. Output from a tape deck during fast forward or
rewind.
3. Acoustic feedback from a microphone or an
electric musical instrument.
4. “Shock” noise which occurs when input or output
connection cords are connected or disconnected
or when a phono cartridge is replaced.
a

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This unit is equipped with the automatic-reset type
of speaker-protection circuitry in order to protect
the
twéeter/midrange/super
tweeter
speaker
units
from
damage
due
to
excessive
input
or
abnormal
signals.
e
If
excessive
input
is
supplied
to
the
tweeter/
midrange/super
tweeter,
the
input
will
be
shut
off
by
the
built-in
protection
circuitry.
|
. Reduce the amplifier’s volume level immediately.
. The speaker-protection circuitry will be auto-
matically reset in a few seconds; before
increasing the amplifier’s volume level, please
check to be sure all equipment in your system in
functioning properly.
3. Be careful not to increase the volume of the
amplifier too much.
Nm —
This
speaker
system
includes
a
power
indicator
which
lights
up
to
display
the
tevel
of
the
power
input
Signals.
The
red
indicator
lights
up
to
indicate
that
signals
corresponding
to
the
maximum
input
power
of
the
speaker,
or
signals
exceeding
this
limit,
are
being
applied;
however,
if
the
input
level
is
low,
this
indicator
will
not
light
up.
if
you
use
the
speakers
with
this
red
indicator
continuously
on,
you
may
damage
them.
When
the
red
indicator
comes
on,
therefore,
turn
down
the
volume
control
on
the
amplifier.
This speaker system includes a level control which
can be used for adjustment of the level of the tweeter
and super tweeter sound and cut off the super
tweeter sound depending upon the room acoustics,
the sound source, and the characteristics of the
phono cartridge and the amplifier which are used
with this speaker system, as well as your own
preference. The standard setting of the leve! control
is the “max” position and super high cut is the “off”
position.
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e Although the enclosure and the speaker units of
this speaker system are made of carefully se-
lected material and have been produced by the
finest manufacturing techniques, sudden chan-
ges in surrounding temperatures and/or humidity
should be avoided. Keep this unit away from
sources of heat, high humidity and direct sun-
light.
e The speaker system should not be placed near a
TV, because the magnet may cause a disturbance
in the TV picture. |
e If the enclosure becomes dirty, use a soft, dry
cloth to wipe it clean. If the dirt is excessive, soak
a soft cloth in a weak solution of soap and water,
wring it thoroughly, and then clean the enclosure.
A soft dry cloth should then be used to wipe it dry.
Never use alcohol, paint thinner, benzine nor
other volatile chemicals to clean this unit because
they may damage the finish, causing it to lose its
juster. Also never use a wet cloth ora chemically-
impregnated cloth.
Type: 4 way 5 speaker
bass-reflex system
Speakers: Woofer: 41 cm, cone type
Midrange: 18 cm, cone type
Tweeter: horn type
- Super Tweeter: horn type X 2
Impedance: 8 ohms
Input Power: 380W, Music
Output Sound
Pressure Level: 99 dB/W (1.0 m)
Crossover
Frequency:
350
Hz,
3,000
Hz,
10,000
Hz
Frequency Range: 20Hz~ 40 kHz
Dimensions: 46.4(W) X 72.0(H) X
30.9(D) cm
Weight: 16.5 kg