Pioneer GR-470 User manual

Operating
GRAPHIC EQUALIZER
F-47770
Q PIONEER
Instructions
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TAPE
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Thank you for buying this Pioneer product.
Please
read
through
these
operating
instructions
so
you
will
know
how
to
operate
your
model
properly.
After
you
have
fin-
ished
reading
the
instructions,
put
them
away
in
a
safe
place
for
future
reference.
In
some
countries
or
regions,
the
shape
of
the
power
plug
and
power
outlet
may
sometimes
differ
from
that
shown
in
the
explanatory
drawings.
However,
the
method
of
connecting
and operating the unit is the same.
WARNING:
To
prevent
FIRE
OR
SHOCK
HAZARD,
DO
NOT
EXPOSE
THIS
APPLIANCE
TO
RAIN
OR
MOISTURE.
IMPORTANT NOTICE
[For U.S. and Canadian models]
The serial number for this equipment is located on the rear
panel. Please write this serial number on your enclosed war-
ranty card and keep it in a secure area. This is for your security.
[For Canadian model]
CAUTION:
to
prevent
ELECTRIC
SHOCK
DO
NOT
USE
THIS
(POLARIZED)
PLUG
WITH
AN
EXTENSION
CORD,
RECEP-
TACLE
OR
OTHER
OUTLET
UNLESS
THE
BLADES CAN
BE
FULLY
INSERTED
TO
PREVENT
BLADE
EXPOSURE.
ATTENTION:
pour
prevenir
LES
CHOCS
ELECTRI-
QUES
NE
PAS
UTILISER
CETTE
FICHE
POLARISEE
AVEC
UN
PRO-
LONGATEUR
UNE
PRISE
DE
COURANT
OU
UNE
AUTRE
SORTIE
DE
COURANT,
SAUF
SI
LES
LAMES
PEUVENT
ETRE
INSEREES
A
FOND
SANS
EN
LAISSER
AUCUNE
PARTIE
A
DECOUVERT.
Rear Panel Facilities
System Connections |
System Connections II
Front Panel Facilities
LINE VOLTAGE SELECTOR SWITCH
Only
multi
voltage
models
are
provided
with
this
switch,
U.
S.,
Canadian,
U.
K.,
Australian
and
European
models
are
not
provided
with
this
switch.
You
will
find
the
line
voltage
selector
switch
on
the
rear
pan-
el.
Before
your
model
is
shipped
from
the
factory,
the
switch
is
set
to
the
power
requirements
of
the
destination;
neverthe-
less,
you
should
check
that
it
is
set
properly
before
plugging
the
power
cord
into
the
AC
outlet.
If
the
voltage
is not
properly
set,
or
if
you
move
to
an
area
where
the
voltage
requirements
differ,
adjust
the
selector
switch
as
follows.
Before
adjust-
ing,
disconnect
the
power
cord.
1.
Use
a
medium-size
screwdriver.
2.
Insert
the
screwdriver
into
the
groove
of
the
selector
switch
and
turn
it so
that
the
power
voltage
marking
of
your
area
points
to
the
arrow.
VOLTAGE SELECTOR
Vv
Medium-size
screwdriver
Individual Operations
Troubleshooting
Block Diagram
Specifications

SAFETY INSTRUCTIONS
READ INSTRUCTIONS — All the safety and
operating instructions should be read before the
appliance is operated.
RETAIN INSTRUCTIONS — The operating instruc-
tions should be retained for future reference.
HEED WARNING — All warnings on the appliance
-and in the operating instructions should be adhered
to.
FOLLOW INSTRUCTIONS — Ail operating and use
instructions should be followed.
WATER AND MOISTURE — The appliance should
not be used near water — for example, near a
bathtub, washbow/, kitchen sink, laundry tub, in a
wet basement, or near a swimming pool, etc.
LOCATION — The appliance should be installed in a
POWER LINES — An outdoor antenna should be
located away from power lines.
NONUSE PERIODS — The power cord of the ap-
pliance should be unplugged from the outlet when
left unused for a long period of time.
OBJECT AND LIQUID ENTRY — Care should be
taken so that objects do not fall and liquids are not
spilled into the enclosure through openings.
DAMAGE REQUIRING SERVICE — The appliance
should be serviced by Pioneer authorized service
center or qualified service personnel when:
e The power-supply cord or the plug has been
damaged; or
e Objects have fallen, or liquid has been spilled into
the appliance; or
OUTDOOR ANTENNA GROUNDING — If an
outside antenna is connected to the antenna
terminal, be sure the antenna system is
grounded so as to provide some protection
against voltage surges and built up static
charges.
in the U.S.A. section 810 of the National Elec-
trical Code, ANSI/NFPA No. 70-1984, pro-
vides information with respect to proper
grounding of the mast and supporting struc-
ture, grounding of the lead-in wire to an anten-
na discharge unit, size of grounding conduc-
tors, location of antenna-discharge unit, con-
nection to grounding electrodes, and re-
quirements for the grounding electrode. See
stable location. The appliance has been exposed to rain; or Fig. A.
WALL OR CEILING MOUNTING — The appliance The appliance does not appear to operate normally
should not be mounted to a wall or ceiling. or exhibits a marked change in performance; or
VENTILATION — The appliance should be situated so e The appliance has been dropped; or the enclosure
that its location or position does not interfere with damaged.
its proper ventilation. For example, the appliance SERVICING — The user should not attempt to service
should not be situated on a bed, sofa, rug, or the appliance beyond that described in: the
similar surface that may block the ventilation open- operating instructions. For all other servicing, con-
ings; or, placed in a built-in installation, such as a tact the nearest Pioneer authorized service center.
bookcase or cabinet that may impede the flow of
air through the ventilation openings.
HEAT — The appliance should be situated away from
heat
sources
such
as
radiators,
heat
registers,
a)
Use
No.
10
AWG
(5.3
mm?)
stoves,
or
other
appliances
(including
amplifiers)
copper,
No.
8
AWG
(8.4
/
that
produce
heat.
mm?)
aluminum,
No.
17
POWER
SOURCES
—
The
appliance
should
be
con-
POWER
LINES
AWG
(1.0
mm?)
copper-
nected
to
a
power
supply
only
of
the
type
describ-
clad
steel,
bronze
wire,
or
ed
in
the
operating
instructions
or
as
marked
on
the
SERVICE
larger
as
ground
wire.
appliance.
SO
eerpas
Saooce
b)
Secure
antenna
lead-in
and
POWER-CORD PROTECTION — Power-supply cords
should be routed so that they are not likely to be
walked on or pinched by items placed upon or
against them, paying particular attention to cords
at plugs, convenience receptacles, and the point
where they exit from the appliance.
POLARIZATION — If your purchased product is pro-
vided with a polarized power plug, please read the
following instructions. This product is equipped
with a polarized alternating current line plug (a plug
having one blade wider than the other), This plug
will fit into the power outlet only one way. This is a
TER
INSULATORS b
ANTENNA
LEAD-IN WIRE
TO EXTERNAL ANTENNA d)
ground wires to house with
stand-off insulators spaced
from 4 feet (1.22 meters) to
6 feet (1.83 meters) apart.
c) Mount antenna discharge
unit as closely as possible to
where lead-in enters house.
Use jumper wire not smaller
than-No.6 AWG-(13.3-mm?)
MINALS OF PROOUCT
GROUND
A WIRE a.b
1 GROUND
y CLAMPS
disc.
ANTENN,
copper or equivalent when
separate antenna-ground-
ing electrode is used.
NNA
HARGE UNIT c
SERVICE ENTRANCE
EQUIPMENT
GROUNO
WIRE a,b
safety feature. If you are unable to insert the plug
fully into the outlet, try reversing the plug. If the
plug should still fail to fit, contact your electrician
to replace your obsolete outlet. Do not defeat the
safety purpose of the polarized plug.
CLEANING — The appliance should be cleaned only
with
a
polishing
cloth
or
a
soft
dry
cloth.
Never
BONOING
i1__
ORIVEN
@
FEET
(2
44
mi
clean
with
furniture
wax,
benzine,
insecticides
or
ume?
Te
REQUIRED
BY
De : OCAL CODES SEE
other volatile liquids since they may corrode the FIG.A u NEC SECTION 810-21 (1)
POWER SERVICE
GROUNDING ELECTRODE SYSTEM
(e. g. interior metal water pipe) OPTIONAL ANTENNA
GROUNDING ELECTRODE
2
cabinet.
IMPORTANT 1
The lightning flash with arrowhead, within an
equilateral triangle, is intended to alert the user of the
presence of uninsulated ‘‘dangerous voltage” within the
product's enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to persons.
IMPORTANT 2
If the apparatus is fitted with AC mains power outlet(s),
see REAR PANEL FACILITIES for convenient connec-
tion of additional Hi-Fi component(s). Make all connec-
tions to the AC outlet(s) and the signal terminals first.
Connect the plug to the wall socket last, make sure that
the power switch is off. Disconnect the wall plug when
the equipment is not in (regular) use, e.g. when on
vacation.
<ARB1012>
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION:
TO PREVENT THE RISK OF ELECTRIC SHOCK, DO
NOT REMOVE COVER (OR BACK). NO USER-
SERVICEABLE PARTS INSIDE. REFER SERVIC-
ING TO QUALIFIED SERVICE PERSONNEL.
FOR USE IN THE UNITED
KINGDOM
WARNING: This plug must only be connected to
electronic apparatus equipped with suitable
sockets.
If not, cut off the plug and fit an appropriate type
in accordance with the instructions below.
The cut-off plug must be disposed of as an elec-
trical shock hazard could exist if connected to a
socket outlet.
The exclamation point within an equilateral triangle is
intended to alert the user of the presence of important
operating and maintenance (servicing) instructions in
the literature accompanying the appliance.
The wires in this mains lead are coloured in accordance
with the following code:
Blue: Neutral
Brown: Live
As the colours of the wires in the mains lead of this ap-
paratus may not correspond with the coloured marking
identifying the terminals in your plug proceed as
follows:
The wire which is coloured blue must be connected to
the terminal which is marked with the letter N or col-
oured black.
The wire which is coloured brown must be connected to
the terminal which is marked with the letter L or col-
oured red.

REAR PANEL FACILITIES
Two pin-plug cords are included as accessories. These are to
be used to connect the graphic equalizer to your stereo ampili-
fier. The white plug is for the left channel, and the red plug is
for the right channel.
EQUALIZER jacks TAPE jacks
7 EQUA UZER —<\———
(o o6 ©
© O@
ieae =|
INPUT OUTPUT
AC power cord.
Pin-plug cords
AC outlet
Connect to auxiliary AC outlet on
amplifier.
EQUALIZER jacks
Connect to stereo amplifier. If your stereo amplifier has
only one set of tape jacks, connect them to the graphic
equalizer’s INPUT and OUTPUT terminals.
TAPE jacks
If your stereo amplifier has only one set of tape jacks, con-
nect them to your tape deck. If your amplifier has two sets
of tape jacks (Tape 1, Tape 2), a second tape deck may be
connected to the graphic equalizer’s tape jacks.
AC OUTLET (UNSWITCHED 100 W MAX)
Power flows continually to this outlet, regardless of whether
the equalizer is switched ON or OFF. Electrical power con-
sumption of the connected equipment should not exceed
100 W. The equalizer should be disconnected by removing
the mains plug from the wall socket when not in regular use,
e.g. when on vacation.
NOTE:
Do
not
connect
appliances
with
high
power
consumption
such
as
heaters,
irons,
or
television
sets
to
the
AC
OUTLET
in
order
to avoid overheating or fire risk.
This can cause the equalizer to malfunction.
STEREO AMPLIFIER TAPE JACKS
When stereo amplifier has one set of tape jacks:
Connect [INPUT] jacks to the stereo amplifier’s tape REC
jacks, and connect [OUTPUT] jacks to the stereo amplifier’s
tape PLAY jacks.
Equalizer
Tape jacks jacks
ZN
Amplifier
Tape jacks
fr SN
When stereo amplifier has two sets of tape jacks:
Connect
[INPUT]
jacks
to
the
stereo
amplifier’s
AUDIO
ADAPTOR
or
Tape
2/Adaptor
[REC]
jacks,
and
connect
[OUTPUT]
jacks
to
the
stereo
amplifier’s
AUDIO
ADAPTOR
or
Tape
2/Adaptor
[PLAY]
jacks.
AUDIO ADAPTOR or
Tape 2/Adaptor Equalizer
jacks
jacks
Tape
jacks
FF ON
Tape deck 2
fn = N
Amplifier
Tape 1 jacks
ff N
Tape deck 1
Connect TAPE REC jacks to the tape deck’s LINE (REC)
jacks.
Connect TAPE PLAY jacks to the tape deck’s LINE (PLAY)
jacks.
3
<ARB1012>

SYSTEM
CONNECTIONS
I
(When
amplifier
has
two
sets
of
tape
deck
jacks)
This
illustration
is
an
example
of
the
connections
mede
when
ponents.
For
details,
consult
the
Operating
Instructions
of
the
using
the
GR-470
in
conjunction
with
PlONEER’s
System
Com-
respective
components.
Accessory cord provided with the tape deck
LINE
INDUIT ensTOT
1Ar Cy IPLAY]
Accessory cord provided
with the tape deck
EQUALIZER jacks
GR-470
AC
OUT LET
UNSWITCHED
100WMAX
TAPE jacks
Speaker systems
®
Accessory cords provided
with GR-470
SWITCHED
TOT:
100W MAX
LINE
a anne
(REC) [PLAY] r
Power plug
AC wall
outlet
4
<ARB1012>

SYSTEM
CONNECTIONS
II
jacks)
ny
ne
et
tae
deck
When connecting components, be sure that all power swit-
ches are OFF. For details, consult the Operating Instructions
for the components to be connected.
Accessory cords provid
the tape deck
EQUALIZER jacks
AC
OUT LET
UNSWITCHED
1OOWMAX
TAPE jacks
Accessory cord provided with GR-470 oe
Stereo amplifier
AC OUTLETS
ae gg an
TOTAL
100 W MAx
UNSWITCHEO
100 W MAX
= le
Power cord
Power plug
Speaker system AC wall outlet
<ARB1012>

FRONT PANEL FACILITIES
Power indicator
Tape monitor
indicator
LEFT channel
Equalizer
indicators
RIGHT channel
Equalizer
indicators
@) POWER SWITCH (POWER STAND-BY/ON)
When this switch is set to the ON position, power is supplied
to the unit's main circuits (Power indicator lights). The unit's
power switch is geared to selecting the transformer’s secon-
dary and so even at the STAND-BY position, the unit's circui-
try will work as long as the power cord is connected to the
power outlet.
Disconnect the power cord from the power outlet when
you do not plan to use the unit for a long period of time.
NOTE:
Even when performing playback without using the functions of
this component, be sure that its power switch is ON. If the power
switch is OFF, no sound will be produced from the speakers.
(2) EQUALIZER SWITCH (EQUALIZER)
When this switch is pressed, the equalizer indicators light
and its functions become operative. When pressed once
again, these indicators go out and the unit's functions are
turned OFF. Use this switch in the following manner:
ON: When using the equalizer to add sound compen-
sation while performing mixing operations with
program sources (FM broadcasts, records, tape
playback, etc.), and playing back and/or recording
the results.
OFF: When not using the equalizer, but playing back
or recording program sources without compen-
sation.
In this case, the equalizer cannot be used, but
tape monitor selection can be performed (when
tape monitor indicator is ON, tape playback, and
when OFF, source playback).
6
<ARB1012>
TAPE
| esuauzer | monitor |
(3) TAPE MONITOR SWITCH
When this switch is pressed, the tape monitor indicator
lights. When pressed again, the indicator goes out. Use
this switch in the following manner:
ON: When using the tape deck connected to the equal-
izer’s tape terminals to play back tapes with or with-
out adding sound compensation.
OFF: When using the components (tuner, turntable, tape
deck) connected to the stereo amplifier to play back
music with or without adding sound compensations.
(4) EQUALIZER CONTROLS
These are equalizer controls for the bands 60 Hz, 150 Hz,
400 Hz, 1 kHz, 2.4 kHz, 6 kHz and 15 kHz.
When the equalizer switch has been set to ON, these con-
trols may be adjusted. When a control is raised upwards
from the ‘‘0”’ position, the frequency band corresponding
to that control will be emphasized; when the control is
lowered, the frequency band will be attenuated. These
controls can be used independently for right and left chan-
nels.
NOTE:
/n order to protect your speakers from damage resulting from
excessively large inputs, whenever augmenting high-frequency
sounds over a wide range, be sure not to raise your amplifier’s
sound volume too high.

USING THE EQUALIZER CONTROLS
The graphic equalizer divides the music source into a number
of frequency bands and boosts or attenuates the level at
each of the frequencies, enabling much finer sound quality
adjustments than ordinary tone controls and sound field
compensation.
Some examples of operation are given below.
GRAPHIC EQUALIZER
SO ems 150 em SOC mmm 1 come 2.4K comes GK ee 15K eee 12
COMPENSATING FOR THE PLAYBACK
FREQUENCY RESPONSE
The frequency response of a phono-cartridge or speaker has
peaks and dips in the high range and low range. It can be
made flat by adjusting finely the controls on the graphic
equalizer.
IMPROVING THE ACOUSTICS OF THE
LISTENING ROOM
The ideal listening room is one where the transmission fre-
quency response is flat. In actual fact, however, the
acoustics vary depending on the effects of the structure of
the room and its furniture, and on the listening position.
Although there is minimal treble attenua-
tion in a listening room surrounded by
hard walls and windows and having a
bare floor, the bass sounds are reflected
to a great extent.
In rooms like this, turn up the 150 Hz
control slightly. .
In a room surrounded by drapes and with
carpets on the floor, there is minimal
reflection of the sound and both the bass
and the treble are absorbed.
Amplitude of change in frequency
response using ordinary tone con-
Level
— Frequency
Amplitude of change in frequency
response using graphic equalizer
controls
Peak
or wns,
ow
=
TS
Compensated peak
Overall frequency
response
Frequency ——=—
In rooms like this, turn up the 60 Hz con-
trol slightly and turn up the frequency
controls above 2.4 kHz gradually.
The above examples are extremely
general.
The acoustics undergo change in accord-
ance with the furniture in the listening
room, the height of the ceiling and the
listening position, among other factors.
Play the music and try operating each of
the controls to produce the best effect.
7
<ARB1012>

USING THE EQUALIZER CONTROLS
COLORING THE REPRODUCED SOUND
All instruments and vocals have their own frequency band,
as shown in the figure.
By moving the controls up or down, the volume of the in-
struments preferred can be boosted or other instruments
can be attenuated.
For instance, it is possible to boost the 60 Hz frequency and
give the bass drum a greater ‘‘punch’”’ or boost the 1 kHz
frequency and position the vocals at the front. When the
6 kHz frequency is boosted, the cymbals and ‘high hat’’
sound much clearer.
Instruments and vocals have a great many harmonic com-
ponents along with the fundamental frequency band and so
you can have lots of fun operating the 7 controls to achieve
the sound of your choice.
NOTE:
In order to protect the speakers from damage resulting from
power overload, do not excessively increase the stereo amp-
lifier’s volume level when boosting the treble range on this unit.
(4) RECORDING TECHNIQUES USING THE
GRAPHIC EQUALIZER
Coloring the sound of vocals or instruments
The sound of vocals and instruments can be colored at will
by operating the controls. For instance, when the 400, 1
k and 2.4 k controls are raised and the other controls
lowered, people’s voices sound as if heard on a telephone.
Preventing how! during mixing play
Any irritating howl during play can be prevented by lower-
ing the knob corresponding to the frequency band in which
the howl occurs.
8
<ARB1012>
GO sme 150 cums 400 meme 1K omen 2.4 somes GK meme 15K eomeee'Z
Soprase
a
=".
nate
——.
40 60 100 400 600 1k 2k 4k 6k 10k 20k
Frequency (Hz)
Noise can be reduced during recording and
playback
When the high-range controls are boosted in step fashion
during recording and then lowered in reverse fashion dur-
ing playback, tape hiss and other high-range noise can be
reduced.
Creating recorded tapes most compatible with
the playback equipment
A sound with a greater ‘‘punch’”’ can be recorded for play-
back on car stereo equipment if the ultra-low-range, which
is hard to hear, is cut out and the mid-range is boosted.

INDIVIDUAL OPERATIONS
14 COMBINING THE EQUALIZER WITH RECORD PLAYBACK
——— Perform the following operations in numerical order.
Turntable
Play
back
record.
Set
amplifier’s
Function
switch to PHONO
(or INPUT SELECTOR switch to PHONO).
Stereo amplifier
Left (L) Right (R)
Right channel
Left channel!
speaker
speaker
Set amplifier’s ADAPTOR/TAPE 2
switch to ON (or TAPE monitor
switch).
EQUALIZER EQUALIZER
INPUT OUTPUT
Set equalizer switch to
ON
Set tape monitor switch
to OFF.
Adjust equalizer
controls.
) 60 wom 150 momen 400 meme 1 mm 2.4 comme GK cm 15K eee 1Z
a a Ua vc ary
Press to ON. Set to OFF.
Adjust to desired levels.
9
<ARB1012>

INDIVIDUAL OPERATIONS
Ld USING THE EQUALIZER WHILE LISTENING TO BROADCASTS AND RECORDING THE RESULTS.
——— Perform the following operations in numerical order.
Record results on tape.
Tuner
Tune in desired
station.
Left (L)
Left channel
speaker
EQUALIZER
INPUT
(A) set amplifier’s Function
switch to TUNER
(or INPUT SELECTOR switch
to TUNER).
Ei
(Z)’ Record results on tape.
(6) Adjust equalizer
controls.
9 60 ems 150 mmo O00 oem 1 ome 2.0K ce GK mee 1 SK ce HZ
¢Adjust to desired levels.
10
<ARB1012>
e¢ When tape deck 2 connected to the GR-470, or
tape deck 1 connected to the stereo amplifier is
set to the recording mode, the contents of the
equalizer-compensated broadcast can be
recorded on cassette tape.
Set amplifier’s ADAPTOR/TAPE 2
switch to ON (or TAPE monitor
switch).
Right (R)
Right channel
speaker
EQUALIZER
OUTPUT
Set equalizer switch to
ON.
Set tape monitor switch
to OFF.
Press to ON. Set to OFF.