Sony SEQ-431 User manual

SONTY.
Graphic Equalizer
3-756-657-21(1)
SEQ-431
Operating Instructions
Before operating the unit, please read this manual
thoroughly and retain it for future reference.
OWNER'S RECORD
The model and serial numbers are located at the rear.
Record the serial number in the space provided below.
Refer to them whenever you call upon your Sony dealer
regarding this product.
_ Model No. SEQ-431
To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
Serial No.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
This symbol is intended to alert the
user to the presence of uninsulated
“dangerous voltage” within the prod-
uct’s enclosure that may be of suffi-
cient magnitude to constitute a risk of
electric shock to persons.
This symbol is intended to alert the
user to the presence of important
operating and maintenance (servicing)
instructions in the literature accompa-
nying the appliance.
* The graphical symbols are on the rear enclosure.
© 1993 by Sony Corporation
ad ayers Lelie) ats
On safety
© Operate the unit only on 120 V AC, 60 Hz.
e The unit is not disconnected from the AC power source
as long as it is connected to the wall outlet, even if the
unit itself has been turned off.
¢ Should any solid object or liquid fall into the unit, unplug
it and have it checked by qualified personnel before
operating it any further.
e Unplug the unit from the wall outlet if it is not to be used
for an extended period of time. To disconnect the cord,
pull it out by grasping the plug. Never pull the cord itself.
On installation
¢ Do not install the unit in a location near heat sources such
as radiators or air ducts, or in a place subject to direct
sunlight, excessive dust, mechanical vibration or shock.
¢ Good air circulation is essential to prevent internal heat
buildup in the unit. Place the unit in a location with
adequate air circulation. Do not place the unit on a soft
surface.
On cleaning the cabinet
Clean the cabinet, panel and controls with a soft cloth
lightly moistened with mild detergent solution. Do not use
any type of abrasive pad, scouring powder or solvent such
as alcohol or benzine.
On repacking
Do not throw away the carton and the packing material. It
makes an ideal container to transport the unit in.
For the customers in the U.S.A.
For detailed precautions, see the leaflet “IMPORTANT
SAFEGUARD”.
If you have any question or problem concerning your unit,
please consult your nearest Sony dealer.
For the customers in Canada
CAUTION
TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS
POLARIZED AC PLUG WITH AN EXTENSION CORD,
RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT
BLADE EXPOSURE.

Connections
Connecting to the ADAPTOR Jacks of Amplifier
¢ Connect the AC power cord last. Make sure power is off.
¢ The cable connectors should be fully inserted into the
jacks. A loose connection may cause hum and noise.
* Cord plugs and jacks are color coded. Red plugs and
jacks are for right channel (R) and white ones for the left
channel (L).
Amplifier
AC OUTLET
Use the AC outlet to power audio component whose power
consumption is less than the wattage indicated on the AC
OUTLET. The outlet is not controlled by the POWER switch.
Even when the apparatus is switched off, "UNSWITCHED" socket
outlet remains live unless mains plug is pulled out from the wall
outlet.
SEQ-431
to an AC outlet of
the amplifier or a
wall outlet
CAUTI
Do not connect any electrical home appliances such as an
electric iron, fan, TV or other high wattage equipment to the AC
outlet.
Cassette deck

LINE OUT
aap
to
an
AC
outlet
of
the
amplifier
or
a
wall
outlet
Cassette deck
LINE IN

2 Select the
desired source
with the amplifier
and play the
program source,
or play back a
tape on the
cassette deck.
e 4 Press the
volume level of | EQUALIZATION button
EQUALIZATION
indicator lights up.
1 Select the input signal to be equalized.
For the program source from the TAPE: -O
amplifier: G)
Press the TAPE button so that the
_ TAPE indicator goes off.
| Note
_ When connecting to the TAPE jacks of
_ the amplifier, set the tape monitor
~ switch to ON. La3f
eS TAPE —O
: a
e For the sound from the cassette (.)
| deck:
| Press the TAPE button so that the
_ TAPE inidcator lights up.
eed
+10 | bt t~ +10
0 0
-10 — L= -10
6 Hz 150Hz 400 Hz TkHz 24kHz 6 kHz 14 KHZ
Te Or Gr
To listen to the sound without the equalize:
Press the EQUALIZATION button so that the il
goes off. The input signal is directly output to
LINE OUT and TAPE RECORDER REC OUT je

2 Select and play the desired
source.
1 Press the TAPE
button so that the
TAPE indicator goes
off.
3 Press the EQUALIZATION
button so that the
EQUALIZATION indicator
lights up.
Nie-
P EQUALIZATION
5 Set the cassette deck to
recording mode.
To record sound without the equalizer
effect
Press the EQUALIZATION button so that
the indicator goes off.
60 Hz 150Hz 400 Hz kHz 24kHZ 6 kHz 14 kHz

Frequency Coverage of
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Adjustable frequency bands and the effect of level
adjustment
60 Hz: Lowering the level will cut the ventilation noise of a
music hall, hum of electronic instruments, boomy
bass, etc. Raising the level will reinforce the
heavy bass part of a pipe organ or add depth to
the bass sound.
150 Hz: Boosting or cutting the normal bass.
400 Hz:!ncreasing or decreasing the power, spaciousness
and warmth of the sound.
1 kHz: Providing more presence for vocals, and moving
the sound forward or into the background.
2.4 kHz: Lowering the level will reduce stridency, and
raising will make the base sound brighter.
6 kHz: Increasing or decreasing the brightness of the
sound; for example, raising the level will make the
violin sound silky smooth.
14 kHz: Changing the general atmosphere rather than the
sound itself. Raising the level will highlight the
delicate quality of instrumental sound, and
lowering will reduce high-frequency noise such as
the resonant peak of a cartridge tape hiss, etc.
Checking the equalization results
Press the EQUALIZATION button again to off (released
position).
The equalizer circuit is bypassed, and you can hear the
sound without equalization.
By switching the EQUALIZATION button on and off,
compare the results.
The spectrum analyzer can be used to visually confirm the
need for and effect of equalizer adjustment.
SY of =Yol bi Cer- 1a (e] at)
Inputs LINE IN: Phono jacks, 245 mV (-10 dBs),
50 kilohms
TAPE IN: Phono jacks, 245 mV (-10 dBs),
50 kilohms
Outputs LINE OUT: Phono jacks,
245 mV (-10 dBs),
Load impedance: more than 10 kilohms
TAPE REC OUT: Phono jacks,
245 mV (-10 dBs),
Load impedance: more than 10 kilohms
Graphic equalizer
Boost/cut range: +10 dB
Center frequencies: 60 Hz, 150 Hz,
400 Hz, 1 kHz, 2.4 KHz, 6 KHz, 14 KHz
Frequency response (with EQUALIZATION on)
LINE IN: 20 Hz to 40 kHz *°,dB
Harmonic distortion
LINE IN: Less than 0.008%
(at 1 kHz, 1 V output)
Signal-to-noise ratio (with EQUALIZATION on)
LINE IN: Better than 100 dB
(A network, 1 V output)
Power requirements
120 V AC, 60 Hz
Power consumption
5W
1 unswitched, 120 W/1 A max.
Approx. 430 x 80 x 265 mm (w/h/d)
(17x 3'/, x 10 ‘/, inches)
Mass Approx. 2.5 kg (5 Ib 8 oz)
Accessory supplied
Audio connecting cords (2)
AC outlet
Dimensions
Design and specifications are subject to change without
notice.
Troubleshooting
Before going through the check list below, first refer back to the connection and operating procedures.
Should any problem persist after you have made these checks, consult your nearest Sony dealer.
Trouble
No audio even when the POWER
switch is turned on.
Remedy
e Check if the power cord is disconnected.
¢ Check if the connecting cord is disconnected.
¢ Check the TAPE button setting.
No equalization.
e Check if the EQUALIZATION button is set to off (the indicator goes off).
e Check the connections.
The program source connected to the
amplifier cannot be recorded.
Sony Corporation Printed in Japan
¢ Check if the TAPE button is set to on (the indicator lights up).