Contents
Integrated Amplifier
Introduction.................................... 2
A-9755/A-9555
Instruction Manual
Connections................................. 10
Enjoying Audio Sources.............. 14
Troubleshooting........................... 18
Specifications ......Back cover page
Thank you for purchasing an Onkyo IntegratedAmpli-
fier. Please read this manual thoroughly before making
connections and plugging in the unit.
Following the instructions in this manual will enable
you to obtain optimum performance and listening
enjoyment from your new Integrated Amplifier.
Please retain this manual for future reference.
En
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Precautions
1. Recording Copyright—Unless it’s for personal use
only, recording copyrighted material is illegal with-
out the permission of the copyright holder.
For British models
Replacement and mounting of an AC plug on the power
supply cord of this unit should be performed only by
qualified service personnel.
2. AC Fuse—The AC fuse inside the unit is not user-
serviceable. If you cannot turn on the unit, contact
your Onkyo dealer.
IMPORTANT
The wires in the mains lead are coloured in accordance
with the following code:
3. Care—Occasionally you should dust the unit all
over with a soft cloth. For stubborn stains, use a soft
cloth dampened with a weak solution of mild deter-
gent and water. Dry the unit immediately afterwards
with a clean cloth. Don’t use abrasive cloths, thin-
ners, alcohol, or other chemical solvents, because
they may damage the finish or remove the panel let-
tering.
Blue:
Neutral
Brown: Live
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured mark-
ings 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
coloured black.
4. Power
WARNING
BEFORE PLUGGING IN THE UNIT FOR THE
FIRST TIME, READ THE FOLLOWING SEC-
TION CAREFULLY.
AC outlet voltages vary from country to country.
Make sure that the voltage in your area meets the
voltage requirements printed on the unit’s rear panel
(e.g., AC 230 V, 50 Hz or AC 120 V, 60 Hz).
The wire which is coloured brown must be connected to
the terminal which is marked with the letter L or
coloured red.
IMPORTANT
The plug is fitted with an appropriate fuse. If the fuse
needs to be replaced, the replacement fuse must
approved by ASTA or BSI to BS1362 and have the
same ampere rating as that indicated on the plug. Check
for the ASTA mark or the BSI mark on the body of the
fuse.
If the power cord’s plug is not suitable for your socket
outlets, cut it off and fit a suitable plug. Fit a suitable
fuse in the plug.
Some models have a voltage selector switch for
compatibility with power systems around the world.
Before you plug in such a model, make sure that the
voltage selector is set to the correct voltage for your
area.
5. Never Touch this Unit with Wet Hands—Never
handle this unit or its power cord while your hands
are wet or damp. If water or any other liquid gets
inside this unit, have it checked by your Onkyo
dealer.
For European Models
6. Handling Notes
Declaration of Conformity
• If you need to transport this unit, use the original
packaging to pack it how it was when you origi-
nally bought it.
• Do not leave rubber or plastic items on this unit
for a long time, because they may leave marks on
the case.
• This unit’s top and rear panels may get warm
after prolonged use. This is normal.
• If you do not use this unit for a long time, it may
not work properly the next time you turn it on, so
be sure to use it occasionally.
We,
ONKYO EUROPE
ELECTRONICS GmbH
LIEGNITZERSTRASSE 6,
82194 GROEBENZELL,
GERMANY
declare in own responsibility, that the ONKYO product
described in this instruction manual is in compliance with the
corresponding
technical standards such as EN60065,
EN55013, EN55020 and EN61000-3-2, -3-3.
GROEBENZELL, GERMANY
K. MIYAGI
ONKYO EUROPE ELECTRONICS GmbH
3
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Table of Contents
Features
A-9755 Integrated Digital Amplifier
❑ 150 W/Ch into 8 ohms, DIN/300 W/Ch into 4
Introduction
Important Safety Instructions.................. 2
Precautions ............................................... 3
Table of Contents...................................... 4
Features..................................................... 4
Supplied Accessories............................... 5
Connecting the Supplied Power Cord.....5
Installing the Remote Controller’s
Batteries..............................................5
Front & Rear Panels.................................. 6
Front Panel .............................................6
Rear Panel..............................................7
Remote Controller..................................... 8
Using the Remote Controller ..................9
ohms, JEITA
❑ Exclusive Onkyo VL Digital Technology
❑ Pure Stream Power Supply (2 Transformers)
❑ All Discrete Output Stage Circuitry
❑ Low-Impedance, Thick Bus Plate
❑ Optimum Gain Volume Circuitry
❑ Audiophile-Grade Capacitor
❑ Precision Motor Volume Control
❑ Tone Control (Bass, Treble, Loudness
On/Off)
❑ Pure Direct Mode
Connections
❑ Discrete Phono Equalizer
❑ 7 Gold-Plated Audio Inputs and 2 Outputs
❑ Main In Terminal
❑ Blue Illuminated Volume Control
❑ Hi-Rigidity, Anti-Resonant Chassis and
Brass Stabilizers
❑ Gold-Plated, Banana Plug-Compatible
Transparent Speaker Terminals
❑ Heavy-Duty Power Cord
Connecting the A-9755/A-9555 .............. 10
Connecting Your Speakers...................10
Before Making any Connections...........11
Audio Components ...............................11
Connecting a Turntable...................... 11
Connecting a CD Player..................... 11
Connecting a Tuner............................ 12
Connecting a Cassette Deck.............. 12
Connecting an MD Recorder.............. 12
Connecting a Remote Interactive Dock
(RI Dock) ...................................... 12
Connecting a TV or Other Component
with an Audio Output .................... 12
Connecting a Preamp (A-9755 only) ..... 13
❑ Compatible with RI Dock for the iPod
❑ RI (Remote Interactive) Remote Control
A-9555 Integrated Digital Amplifier
Connecting
Components ............. 13
❑ 100 W/Ch into 8 ohms, DIN/200 W/Ch into 4
ohms, JEITA
Enjoying Audio Sources
❑ Exclusive Onkyo VL Digital Technology
❑ Pure Stream Power Supply
❑ Discrete Output Stage Circuitry
❑ Low-Impedance, Thick Bus Plate
❑ Optimum Gain Volume Circuitry
❑ Precision Motor Volume Control
❑ Tone Control (Bass, Treble, Loudness
On/Off)
❑ Pure Direct Mode
Turning On the A-9755/A-9555.............14
Selecting Speaker.................................14
Listening to Components ......................15
Muting the A-9755/A-9555 (remote
controller only).............................. 15
Using Headphones............................. 15
Using the Tone Controls .......................16
Setting the PURE DIRECT Function....16
Adjusting the Bass ............................. 16
Adjusting the Treble ........................... 16
Loudness Control..................................16
Using the MAIN IN Function (A-9755
only) ................................................ 17
Recording .............................................17
❑ Discrete Phono Equalizer
❑ 7 Audio Inputs and 2 Outputs
❑ Hi-Rigidity, Anti-Resonant Chassis
❑ Aluminum Volume and Selector Knob
❑ Banana Plug-Compatible Speaker Terminals
❑ Compatible with RI Dock for the iPod
❑ RI (Remote Interactive) Remote Control
Others
Troubleshooting...................................... 18
Specifications.......................................... 20
4
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Supplied Accessories
Make sure you have the following accessories:
Remote controller & two batteries (AA/R6)
Installing the Remote Controller’s
Batteries
To open the battery compartment, press
the small hollow and slide open the cover.
1
A-9755: RC-636S
A-9555: RC-627S
Power cord
Insert the two supplied batteries (AA/R6)
in accordance with the polarity diagram
inside the battery compartment.
2
(Power cord varies from
country to country)
In catalogs and on packaging, the letter added to the end
of the product name indicates the color of the
A-9755/A-9555. Specifications and operation are the
same regardless of color.
Slide the cover shut.
3
Connecting the Supplied Power Cord
Plug the supplied power cord into this AC INLET.
• Do not use a power cord other than the one supplied
with the A-9755/A-9555. The power cord supplied is
designed for use with the A-9755/A-9555 and should
not be used with any other device.
• Never have the power cord disconnected from the
A-9755/A-9555 while the other end is plugged into
the wall outlet. Doing so may cause an electric shock.
Always connect by plugging into the wall outlet last
and disconnect by unplugging from the wall outlet
first.
Notes:
• If the remote controller doesn’t work reliably, try
replacing the batteries.
• Don’t mix new and old batteries or different types of
batteries.
• If you intend not to use the remote controller for a
long time, remove the batteries to prevent damage
from leakage or corrosion.
• Flat batteries should be removed as soon as possible
to prevent damage from leakage or corrosion.
DO NOT connect the
power cord at this
time.
To wall outlet
5
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Front & Rear Panels
Front Panel
(A-9755 only)
1
2 3 4
5
6 7
8
9 0 A B C
This illustration is for A-9755.
For detailed information, refer to the pages in parentheses.
A POWER switch (14)
I PURE DIRECT button and indicator (16)
This button turns the PURE DIRECT function on
and off. The indicator lights up when the PURE
DIRECT function is on.
This is the main power switch. When set to OFF, the
A-9755/A-9555 is completely shutdown. When set
to ON, the A-9755/A-9555 can be set to On or
Standby.
J POWER AMP DIRECT (MAIN IN) button and
indicator (17) (A-9755 only)
B STANDBY indicator (14)
This indicator lights up when the A-9755/A-9555 is
in Standby mode (Only the remote controller can be
used to set the A-9755/A-9555 to Standby).
When the A-9755 is used as a power amplifier with
a separate preamp, this button is used to set the
MAIN IN function. The indicator lights up while
the MAIN IN function is on.
C PHONES jack (15)
K Input selector (15)
This phone jack is for connecting a standard pair of
stereo headphones for private listening.
This control is used to select from the following
input sources: LINE, HDD, PHONO, CD, TUNER,
TAPE, or MD.
D SPEAKERS selector (14)
This control is used to select which speaker set out-
puts sound. You can switch the output speaker set
between four options: OFF, A, B and A+B.
L Input selector indicator (15)
These indicators show the currently selected input
source.
E BASS control (16)
This control is for adjusting the level of bass
sounds.
M Remote control sensor (9)
This sensor receives control signals from the remote
controller.
F TREBLE control (16)
This control is for adjusting the level of treble
sounds.
G LOUDNESS button and indicator (16)
This button is for reinforcing both treble and bass
when the volume is turned down low. Pressing the
button turns the LOUDNESS function on and off.
The indicator lights up when the LOUDNESS func-
tion is on.
H Volume control and indicator (15)
This control is used to adjust the volume of the
A-9755/A-9555.
The indicator flashes while the sound is muted. It
flashes more quickly if any of the speakers is left
unconnected.
6
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Front & Rear Panels—Continued
Rear Panel
1 2
3
4
5
This illustration is for A-9755.
6 7 8 90AB C
(A-9755 only)
A Grounding terminal
K LINE input
This terminal is for connecting a turntable’s ground
wire.
This analog audio input is for connecting a compo-
nent’s analog audio output (TV, etc.).
B PHONO (MM) input
L MAIN IN (A-9755 only)
This analog audio input is for connecting a turntable
with a moving-magnet cartridge.
This analog audio input is for connecting a separate
preamp when you want to use the A-9755 as a
power amplifier.
C SPEAKERS A
These terminal posts are for connecting speaker set
A.
Caution:
Do not connect a component that does not have an
output volume control, such as a CD player,
because the sound will be output at maximum vol-
ume and may damage the A-9755 and your speak-
ers.
D SPEAKERS B
These terminal posts are for connecting speaker set
B.
E AC INLET
This connector is for connecting the supplied power
cord (see page 5).
M
REMOTE CONTROL jacks
These (Remote Interactive) jacks can be con-
F CD input
nected to the
jacks on your other Onkyo audio
components. The A-9755/A-9555’s remote control-
ler can then be used to control all of your compo-
This analog audio input is for connecting a CD
player’s analog audio output.
nents. To use
connection between the A-9755/A-9555 and each
component.
, you must make an analog audio
G TUNER input
This analog audio input is for connecting a tuner’s
analog audio output.
H TAPE IN/OUT
This analog audio input and output are for connect-
ing a cassette deck with an analog audio input and
output.
See pages 10–13 for connection information.
I MD IN/OUT
This analog audio input and output are for connect-
ing an MD recorder with an analog audio input and
output.
J HDD IN
This analog audio input is for connecting a compo-
nent’s analog audio output (RI Dock, etc.).
7
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Remote Controller
Note that the buttons with parenthesized numbers con-
trol the A-9755/A-9555, while the buttons without
parenthesized numbers control other Onkyo products
1
2
connected to the A-9755/A-9555 via
connection.
Note also that some of the connected products may
C
D
E
not be controlled with these buttons. For detailed infor-
mation, refer to the relevant manuals provided for the
individual products.
3
A STANDBY button (14)
This button is used to set the A-9755/A-9555 to
Standby.
F
G
4
B ON button (14)
H
I
This button is used to turn on the A-9755/A-9555.
C Number buttons
5
6
These buttons are used to enter track numbers on a
CD or MD component. To enter a single-digit num-
ber, simply press the corresponding button. The
[10/0] button is used to enter either 10 or 0. The
[>10] button is used when entering 2-digit numbers
above 10.
J
See the instruction manual supplied with each com-
ponent for more information.
7
8
D TUNER buttons
K
L
BAND button: Selects the band (ex. AM or FM) for
the tuner.
FM MODE button: Selects the FM listening mode
(stereo or mono) for the tuner.
PRESET +/- button: Selects radio presets.
TUNING [ ]/[ ] button: Determine the listening
frequency for the tuner.
9
0
A
M
B
E DIMMER button
The button is used to adjust the display brightness
on a CD component.
F VOLUME [ ]/[ ] buttons (15)
These buttons adjust the volume of the
A-9755/A-9555.
G Pause [ ], Play [ ], Stop [ ] buttons
Pause [ ] button: Pauses playback on a CD, MD,
or HDD component; starts reverse playback on a
cassette deck.
Play [ ]: Starts playback on a CD, MD, HDD or
cassette component.
Stop [ ]: Stops playback on a CD, MD, HDD or
cassette component.
Note:
If you have connected any Onkyo double cassette
deck, you can control deck B.
H Reverse and Fast Forward [ ]/[ ] buttons
These buttons are used for reverse and fast forward
on a CD, MD, or HDD component.
I RANDOM button
This button is used to set the random playback func-
tion on a CD, MD, or HDD component. On a cas-
sette deck, the button is used to switch the DOLBY
mode.
8
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Remote Controller—Continued
SELECT button: Confirms the option on the HDD
component menu.
J REPEAT button
This button is used to set the repeat playback func-
tions on a CD, MD, or HDD component. On a cas-
sette deck, the button is used to switch the repeat
playback mode (single side only/both sides).
[
]/[ ] buttons: Selects the option on the HDD
component menu.
K PLAYLIST [ ]/[ ] buttons
Selects a playlist stored on the player on an HDD
component.
Using the Remote Controller
Point the remote controller toward the remote control
sensor.
L ALBUM [ ]/[ ] buttons
Selects an album stored on the player on an HDD
component.
Remote control sensor
M PLAY MODE button
This button sets the playback mode on an MD com-
ponent.
N GROUP/SEARCH button
This button selects groups on an MD component.
On a CD player, it is used to search and select a
track number.
About 5 m
(16 f
eet)
O MEMORY button
This button is used to set the memory playback
function on a CD or MD component. With memory
playback, you can make a custom program.
Notes:
• The remote controller may not work reliably if the
A-9755/A-9555 is subjected to bright light, such as
direct sunlight or inverter-type fluorescent lights.
Keep this in mind when installing.
P ENTER button
This button is used to confirm the settings on a CD
or MD component.
Q CLR button
• If another remote controller of the same type is used
in the same room, or the A-9755/A-9555 is installed
close to equipment that uses infrared rays, the remote
controller may not work reliably.
This button is used to remove the last track from the
memory function program, etc., on a CD or MD
component.
R INPUT [ ]/[ ] buttons (15)
These buttons are used to select from the following
input sources: LINE, HDD, PHONO, CD, TUNER,
TAPE or MD.
• Don’t put anything, such as a book, on the remote con-
troller, because the buttons may be pressed inadvert-
ently, thereby draining the batteries.
• The remote controller may not work reliably if the
A-9755/A-9555 is installed in a rack behind colored
glass doors. Keep this in mind when installing.
S DISPLAY button
This button is used to change the information dis-
played on a CD or MD component. When the input
source is “HDD,” this button turns on the display
backlight on the HDD component.
• The remote controller will not work if there’s an
obstacle between it and the A-9755/A-9555’s remote
control sensor.
T MUTING button (15)
This button is used to mute the A-9755/A-9555.
U Previous and Next [
]/[
] buttons
These buttons are used to select the previous or next
track on a CD, MD, or HDD component. Pressing
them repeatedly selects earlier or later tracks. On a
cassette deck, they’re used for rewind and fast for-
ward.
V SCROLL button
This button is used to scroll text displayed on an
MD component. When the input source is “HDD,”
this button turns on the display backlight on the
HDD component.
W MENU, SELECT, [ ]/[ ] buttons
MENU button: Displays the HDD component
menu.
9
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Connecting the A-9755/A-9555
ConnectingYour Speakers
Speaker Connection Precautions
Connecting the Speaker Cables
You can connect one or two sets of speakers (A/B) to
the A-9755/A-9555, and select which set outputs sound,
or use both sets at the same time.
For both speakers A and B, make sure to connect them
with Left and Right in pairs. If you connect either Left
or Right channel alone, no sound output will be avail-
able. If the electrical contact is poor for the connection,
the Volume indicator will flash quickly when the power
is supplied.
Strip about 15 mm (5/8
inch) of insulation from
the ends of the speaker
cables, and twist the bare
wires tightly, as shown.
15 mm
(5/8")
1
Unscrew the terminal.
2
3
• Connecting one set of speakers (A or B): Only con-
nect speakers with an impedance of 4 ohms or more
but less than 16 ohms. If you use speakers with a
lower impedance, and use the A-9755/A-9555 at high
volume levels for a long period of time, the built-in
protection circuit may be activated.
• Connecting two sets of speakers (A and B): Only
connect speakers with an impedance of 8 ohms or
more but less than 16 ohms. If you use speakers with
a lower impedance, and use the A-9755/A-9555 at
high volume levels for a long period of time, the
built-in protection circuit may be activated.
• Disconnect the power cord from the wall outlet
before making any connections.
• Read the instructions supplied with your speakers.
• Pay close attention to speaker wiring polarity. In other
words, connect positive (+) terminals only to positive
(+) terminals, and negative (–) terminals only to nega-
tive (–) terminals. If you get them the wrong way
around, the sound will be out of phase and will sound
unnatural.
Fully insert the bare
wires.
Screw the terminal tight.
4
The following illustration shows which speaker should
be connected to each pair of terminals.
Left
speaker
Right
speaker
Speaker set A
–
+
–
+
• Unnecessarily long or very thin speaker cables may
affect the sound quality and should be avoided.
• Be careful not to short the
positive and negative wires.
Doing so may damage the
A-9755/A-9555.
• Don’t connect more than one
cable to each speaker termi-
nal. Doing so may damage
the A-9755/A-9555.
• Don’t connect a speaker to more than one pair of
speaker terminals.
A-9755/A-9555
–
+
–
+
Right
speaker
Left
speaker
Speaker set B
10
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Connecting the A-9755/A-9555—Continued
RCA Audio Connection Color Coding
Before Making any Connections
• Red connectors are used for the right channel, and
white connectors are used for the left channel.
• Always refer to the instructions that came with the
component that you are connecting.
Left (white)
L
• Do not plug in the power cord until all connec-
tions have been properly made.
• Do not bind audio cables with power cords and
speaker cables. Doing so may adversely affect the
sound quality.
Right (red)
R
• To prevent interference, keep power cords and
speaker cables away from the tuner’s antenna.
• Push each plug in all the way to make a good con-
nection (loose connections can cause noise or
malfunctions).
Right!
Wrong!
Audio Components
Connecting a Turntable
Connecting a CD Player
The A-9755/A-9555’s PHONO input jacks are for use
with moving-magnet (MM) type cartridges.
Use an analog audio cable to connect the
Use an analog audio cable to connect the
A-9755/A-9555’s CD L/R jacks to the analog audio out-
put jacks on the CD player, as shown.
A-9755/A-9555’s PHONO L/R jacks to the audio out-
put jacks on the turntable, as shown.
ANALOG
OUT
AUDIO OUT
Ground wire
Notes:
• If the turntable has a ground wire, connect it to
A-9755/A-9555’s GND terminal. With some turnta-
bles, connecting the ground wire may cause hum, in
which case it should be disconnected.
• If the turntable has a moving-coil (MC) type car-
tridge, you’ll need a commercially available MC
phono preamp. In this case, connect the turntable to
the phono preamp’s input, and connect the phono
preamp’s output to the A-9755/A-9555’s PHONO
L/R jacks.
11
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Connecting the A-9755/A-9555—Continued
Connecting a Tuner
Connecting a Remote Interactive Dock
(RI Dock)
Use an analog audio cable to connect the
A-9755/A-9555’s TUNER L/R jacks to the analog
audio output jacks on the tuner, as shown.
Use an analog audio cable to connect the
A-9755/A-9555’s HDD IN L/R jacks to the RI Dock’s
analog audio output jacks, and use an
cable to con-
nect the A-9755/A-9555’s
jack to the RI Dock’s
jack, as shown.
OUT
Connecting a Cassette Deck
RemoteInteractive
Dock
R
----
L
AUDIO OUT
Use an analog audio cable to connect the
A-9755/A-9555’s TAPE IN L/R jacks to the cassette
deck’s analog audio output jacks, and use another ana-
log audio cable to connect the A-9755/A-9555’s TAPE
OUT L/R jacks to the cassette deck’s analog audio input
jacks, as shown.
Note:
If you use the Onkyo Remote Interactive Dock (DS-
A1), flip the RI MODE switch to “HDD” which is
located on the underside.
Connecting aTV or Other Component with
an Audio Output
Use an analog audio cable to connect the
A-9755/A-9555’s LINE L/R jacks to the analog audio
output jacks on the TV or other component, as shown.
/
REC
(IN)
PLAY
(OUT)
Connecting an MD Recorder
Use an analog audio cable to connect the
A-9755/A-9555’s MD IN L/R jacks to the MD
recorder’s analog audio output jacks, and use another
analog audio cable to connect the A-9755/A-9555’s MD
OUT L/R jacks to the MD recorder’s analog audio input
jacks, as shown.
AUDIO OUT
Note:
If your TV has no audio output, you can connect the
A-9755/A-9555 to an audio output on your VCR and
use its tuner.
REC
(IN)
PLAY
(OUT)
12
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Connecting the A-9755/A-9555—Continued
Connecting a Preamp (A-9755 only)
With
(Remote Interactive), you can control your
-compatible Onkyo CD player, Tuner, and so on
with the A-9755/A-9555’s remote controller.
The A-9755 can be used as a power amplifier with a
separate preamp.
In this case, use an analog audio cable to connect the
A-9755’s MAIN IN jacks to the preamp’s output jacks.
Connect the speakers to the A-9755, and connect the
playback components to the preamp.
• To use
, you must make an analog audio con-
nection between the A-9755/A-9555 and each
audio component.
A-9755/A-9555
connector
PRE OUT
Onkyo CD player
(DX-7555), etc.
connector
Notes:
• Do not connect a component that does not have an
output volume control, because the sound will be out-
put at maximum volume and may damage the A-9755
and your speakers.
• To turn on the MAIN IN function, press the [POWER
AMP DIRECT (MAIN IN)] button for 3 seconds
until the indicator lights up (page 17).
Onkyo cassette
deck, etc.
connector
Connecting
Components
Remote Interactive
Dock, etc.
Remote control cable
If you connect other Onkyo components to the
A-9755/A-9555 with the appropriate
and audio
Notes:
cables, you can use the following system functions.
cables are special cables solely for use with Onkyo
• Push each plug in all the way to make a good connec-
tion.
products (no
cables are supplied with the
• Use only dedicated
cables for
connections
A-9755/A-9555).
(no cables are supplied with the
A-9755/A-9555).
Auto Power On
• The A-9755/A-9555 has two
jacks. They’re all
When you turn on the power or start playback on a com-
ponent that’s connected to the A-9755/A-9555, the
A-9755/A-9555 will turn on automatically. And when
you set the A-9755/A-9555 to Standby, all connected
components will go on Standby as well (the
A-9755/A-9555’s POWER switch must be set to ON for
this to work).
the same, so you can use either of them.
jacks should be connected only to Onkyo compo-
nents. Connecting them to another manufacturer’s
component may cause the A-9755/A-9555 to mal-
function.
•
• Some components may not support all
functions.
See the manuals supplied with your other Onkyo
components for more information.
• When using the A-9755 as a power amplifier (MAIN IN
Direct Change
When playback is started on an audio component con-
nected via
, the A-9755/A-9555 will automatically
function), the
system functions are unavailable.
select that component as the input source.
Remote Control Operation
You can control all components in your system by using
the A-9755/A-9555’s remote controller. See page 8 for
more information.
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Enjoying Audio Sources
Note:
Turning On the A-9755/A-9555
To shut down the A-9755/A-9555 completely, set the
[POWER] switch to the OFF position ( ).
POWER
STANDBY
indicator
Selecting Speaker
STANDBY
ON
You can select which set of speakers outputs sound.
OFF: Select “OFF,” if you do not connect any speaker.
A: To output sound from the speakers connected to the
SPEAKERS A terminals, turn the SPEAKERS selector
to the “A” position.
B: To output sound from the speakers connected to the
SPEAKERS B terminals, turn the SPEAKERS selector
to the “B” position.
Press the [POWER] switch.
The A-9755/A-9555 retains the power
mode (on/standby) in which the ampli-
fier was the last time you turned off the
system.
A-9755/
A-9555
1
Notes:
• The A-9755/A-9555 is shipped with
the [POWER] switch in the OFF
position ( ). When the power cord
is connected for the very first time or
the [POWER] switch is set to ON
A+B: To output sound from all connected speakers, turn
the SPEAKERS selector to the “A+B” position.
Note:
If the Volume indicator flashes quickly, make sure that
the speakers are connected correctly.
(
) position, the A-9755/A-9555
will turn on.
• When it’s turned on, the
A-9755/A-9555 outputs no sound
for about five seconds. This allows
the circuits to stabilize.
To set the A-9755/A-9555 to
Standby, press the [STANDBY]
button on the remote controller.
The STANDBY indicator lights up.
To turn the A-9755/A-9555 on,
press the [ON] button on the
remote controller.
Remote
controller
2
The STANDBY indicator goes off.
If the A-9755/A-9555 is connected to other compo-
nents via , press the remote controller’s [ON] but-
ton once to turn on the A-9755/A-9555, and press it
again to turn on the other components.
Turning on all system components simultaneously:
You can set the A-9755/A-9555 so that all connected
components are turned on with just one press of the
remote controller’s [ON] button. To do this, turn on the
A-9755/A-9555, and then press and hold the remote con-
troller’s [ON] button for 16 seconds until the
A-9755/A-9555 switches to Standby mode. You will
then be able to turn on the A-9755/A-9555 and all sys-
tem components with just one press of the remote con-
troller’s [ON] button.
If you want to restore the setting to the original state,
reset the A-9755/A-9555. For information about how to
reset, see “How to reset” on page 19.
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Enjoying Audio Sources—Continued
Muting the A-9755/A-9555 (remote
controller only)
Listening to Components
Input selector
You can temporarily mute the output of the
A-9755/A-9555.
SPEAKERS selector
Volume
Press the remote controller’s
[MUTING] button.
1
The A-9755/A-9555 is muted. The
Volume indicator flashes.
INPUT
/
VOLUME
/
To unmute the A-9755/A-9555,
press the [MUTING] button again.
Notes:
MUTING
• The Mute function will be cancelled
if the remote controller’s VOLUME
buttons are pressed or the
A-9755/A-9555 is set to Standby.
• When using the A-9755 as a power
amplifier (MAIN IN function), the
Muting function is disabled.
Turn the input selector to select
the component that you want to
listen to.
1
A-9755/
A-9555
LINE: Select to listen to the compo-
nent connected to the LINE jacks.
HDD: Select to listen to the compo-
nent connected to the HDD jacks.
PHONO: Select to listen to the turnta-
ble connected to the PHONO jacks.
CD: Select to listen to the component
connected to the CD jacks.
Using Headphones
Remote
controller
You can connect a pair of stereo headphones (1/4-inch
phone plug) to the A-9755/A-9555’s PHONES jack for
private listening.
TUNER: Select to listen to the compo-
nent connected to the TUNER jacks.
TAPE: Select to hear the component
connected to the TAPE IN jacks.
MD: Select to listen to the component
connected to the MD IN jacks.
When selecting with the remote con-
troller, use the INPUT [ ]/[ ] but-
tons.
Notes:
• Always turn down the volume before connecting your
headphones.
• All connected speakers are turned off while the head-
phones plug is inserted in the PHONES jack.
• The headphones output no sound while the MAIN IN
function is on.
Start playback on the selected
component.
2
3
To adjust the volume, use the
A-9755/A-9555’s Volume control,
or the remote controller’s VOL-
UME [ ]/[ ] buttons.
A-9755/
A-9555
Turn Volume control clockwise to
increase the volume or counterclock-
wise to decrease the volume.
Remote
controller
Note:
When using the A-9755 as a power
amplifier (MAIN IN function), the
Volume control has no effect.
15
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Enjoying Audio Sources—Continued
Using the Tone Controls
Loudness Control
While the MAIN IN function is on, the A-9755’s tone
controls have no effect.
By pressing the [LOUDNESS] button,
both treble and bass are reinforced
when the volume is turned down low.
Use this button according to the music
source and according to the listening area. Its purpose is
to enrich the natural sound effects of both the treble and
bass.
PURE DIRECT
The indicator lights up when the LOUDNESS function
is on.
• When using the A-9755 as a power amplifier (MAIN
IN function), the Loudness control doesn’t work.
• When the PURE DIRECT function is on, the Loud-
ness control is disabled.
TREBLE
BASS
Setting the PURE DIRECT Function
The [PURE DIRECT] button turns the
PURE DIRECT function on and off.
When the PURE DIRECT function is
off, the tone controls can be used to
adjust the sound, and the PURE DIRECT indicator goes
off.
When the PURE DIRECT function is on, the tone con-
trols are bypassed, so you can enjoy a pure sound. The
PURE DIRECT indicator lights up.
Adjusting the Bass
The BASS control adjusts bass
sounds. Turn it up to make them
louder. Turn it down to make them
quieter. Normally, it should be set
midway.
Adjusting the Treble
The TREBLE control adjusts treble
sounds. Turn it up to make them
louder. Turn it down to make them
quieter. Normally, it should be set
midway.
16
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Enjoying Audio Sources—Continued
Using the MAIN IN Function (A-9755
only)
Recording
Unless you have the full consent of the
copyright holder, copyright laws prohibit
using your recordings for anything other
than personal enjoyment!
You can use the A-9755 as power amplifier with a sepa-
rate preamp. See page 13 for connection information.
Input selector
POWER AMP DIRECT (MAIN IN)
Press the [POWER AMP DIRECT
(MAIN IN)] button for 3 seconds
1
until the MAIN IN indicator lights up.
The MAIN IN function comes on and
the MAIN IN indicator lights up.
Use the input selector to select
the component that you want to
record from.
1
While the MAIN IN function is on,
only audio from components con-
nected to the preamp can be output.
To turn the MAIN IN function off,
press the [POWER AMP DIRECT
(MAIN IN)] button for 3 seconds until
the MAIN IN indicator goes off.
Prepare the recorder:
• Set the recorder so that it’s ready for
recording.
• If necessary, adjust the recording
level on the recorder.
• See the recorder’s manual for more
information.
2
Notes:
• Do not connect a component that
does not have an output volume con-
trol to the MAIN IN jacks and use the
MAIN IN function, because the
sound will be output at maximum
volume and may damage theA-9755
and your speakers.
• While the MAIN IN function is on,
the A-9755’s Volume control has no
effect. Before you turn off the
MAIN IN function, make sure that
the Volume control is not turned up
high, to prevent any loud surprises.
• While the MAIN IN function is on,
the following A-9755 functions are
disabled:
Start playback on the component
selected in step 1.
3
Note:
If you select another input source dur-
ing recording, the newly selected input
source will be recorded.
Notes:
- Volume control
- Input selector
- Remote control operation
• You can record on a recorder that’s connected to the
MD OUT or TAPE OUT L/R jacks.
• The tone controls have no effect on the signal being
recorded.
• When using the A-9755 as a power amplifier (MAIN
IN function), recording is not possible.
-
function
- LOUDNESS control
- Recording
- Muting
Operate the connected preamp for
some of these functions including
controlling volume, selecting input,
and muting. The [STANDBY] and
[ON] buttons on the remote control-
ler will work even when the MAIN
IN function is on.
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Troubleshooting
If you have any trouble using the A-9755/A-9555, look for a solution here. If you can’t resolve the issue yourself,
contact your Onkyo dealer.
Power
Can’t turn on the A-9755/A-9555.
• Make sure that the power cord is properly plugged into the wall outlet. (page 5)
• Unplug the power cord from the wall outlet, wait ten seconds or more, then plug it in again.
• By default, pressing the remote controller’s [ON] button once does not turn on all of the system components. You
need to press the remote controller’s [ON] button again. Alternatively, you can set the A-9755/A-9555 so that all
components do turn on simultaneously (page 14).
The STANDBY indicator is flashing.
• The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately and contact
your Onkyo dealer.
Audio
There’s no sound or it’s very quiet.
• When the A-9755 is used as a power amplifier (MAIN IN indicator lights up), the sound from components connected
to the preamp is output. To output the sound from a component that’s connected to the A-9755, or to use the A-9755
as a preamp, press the [POWER AMP DIRECT (MAIN IN)] button for 3 seconds until the MAIN IN indicator goes
off. (page 17)
• Make sure that all audio plugs are pushed in all the way (page 11).
• Make sure that the inputs and outputs of all components are connected properly.
• Make sure that the polarity of the speaker cables is correct and that the bare wires are in contact with the metal part
of each speaker terminal (page 10).
• Make sure that the correct input source is selected (page 15).
• If theVolume indicator flashes slowly, press the remote controller’s [MUTING] button to unmute the A-9755/A-9555
(page 15).
• Make sure that none of the cables are bent, twisted, or damaged.
• To use a turntable with a moving-coil (MC) type cartridge, you need a commercially available MC phono preamp
(page 11).
• If the Volume indicator flashes quickly, any speakers may not be connected to the A-9755/A-9555. Make sure that
the required connection is performed appropriately, and set the [POWER] switch to the ON position again (pages 10,
14).
• Verify if the SPEAKERS selector is configured correctly. If “OFF” is selected, no sound will be output from any of
the speakers (page 14).
Noise can be heard.
• Using cable ties to bundle audio cables with power cords, speaker cables, and so on may degrade the audio perfor-
mance, so don’t bundle them together.
• An audio cable may be picking up interference. Try repositioning your cables.
The tone controls have no effect.
• If the PURE DIRECT indicator lights up, the PURE DIRECT function is on and the tone controls have no effect.
Press the [PURE DIRECT] button to turn the function off. The PURE DIRECT indicator will go off (page 16).
Remote Controller
The remote controller doesn’t work.
• Make sure that the batteries are installed with the correct polarity (page 5).
• Install new batteries. Don’t mix different types of batteries or old and new batteries (page 5).
• Make sure that the remote controller is not too far away from the A-9755/A-9555 and that there’s no obstruction
between the remote controller and the A-9755/A-9555’s remote control sensor (page 9).
• Make sure that the A-9755/A-9555 is not subjected to direct sunshine or inverter-type florescent lights. Relocate if
necessary (page 9).
• If the A-9755/A-9555 is installed in a rack or cabinet with colored glass doors, the remote controller may not work
reliably when the doors are closed (page 9).
Can’t control other components?
• If it’s an Onkyo component, make sure that the
only an cable won’t work. (page 13)
cable and analog audio cable are connected properly. Connecting
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Troubleshooting—Continued
Recording
Can’t record.
• The component connected to the MAIN IN jacks cannot be recorded.
• When using the A-9755 as a power amplifier (MAIN IN function), recording is not possible.
Others
The Volume control has no effect.
• When using the A-9755 as a power amplifier (MAIN IN function), the Volume control has no effect. Adjust the
volume on the connected preamp instead.
The Muting function doesn’t work.
• When using theA-9755 as a power amplifier (MAIN IN function), the Muting function does not work. Use the muting
function on the connected preamp instead.
The A-9755/A-9555 contains a microcomputer for signal processing and control functions. In very
rare situations, severe interference, noise from an external source, or static electricity may cause
it to lock up. In the unlikely event that this happens, unplug the power cord from the wall outlet,
wait at least ten seconds, and then plug it back in again.
Onkyo is not responsible for damages (such as CD rental fees) due to unsuccessful recordings
caused by the unit’s malfunction. Before you record important data, make sure that the material
will be recorded correctly.
How to reset:
To reset the A-9755/A-9555 to its factory defaults, while holding down the [PURE DIRECT] button,
press the [LOUDNESS] button, and then release both buttons.The input selector indicators light
up for one second, and then the A-9755/A-9555 enters On mode.
A-9755/A-9555 BLOCK DIAGRAM
HEADPHONE
SELECTOR
DIGITAL
AMPLIFIER
MAIN IN
VOLUME
ON
ON
OFF
PHONO
CD
L-ch LOW PASS
FILTER
OFF
TUNER
BASS,
SPEAKER
A
RELAY
TREBLE
POWER
AMP
DIRECT
IN
SPEAKER SPEAKER
SPEAKER B
RELAY
TAPE
A
B
PURE DIRECT
OUT
IN
LOW PASS
FILTER
MAIN IN
R-ch
MD
OUT
ON
ON
OFF
HDD IN
LINE
DIGITAL
AMPLIFIER
OFF
A-9755 ONLY
BASS,TREBLE
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Specifications
A-9755
A-9555
Power output:
150 W + 150 W (8 Ω, 1 kHz, DIN)
300 W + 300 W (4 Ω, 1 kHz, JEITA)
330 W + 330 W (3 Ω, Front)
270 W + 270 W (4 Ω, Front)
170 W + 170W (8 Ω, Front)
0.08 % (1 kHz, 1 W)
100 W + 100 W (8 Ω, 1 kHz, DIN)
200 W + 200 W (4 Ω, 1 kHz, JEITA)
230 W + 230 W (3 Ω, Front)
200 W + 200W (4 Ω, Front)
120 W + 120W (8 Ω, Front)
0.08 % (1 kHz, 1 W)
Dynamic power:
THD (total harmonic distortion):
Damping factor:
Input sensitivity and impedance:
25 (Front, 1 kHz, 8 Ω)
200 mV, 50 kΩ (CD)
25 (Front, 1 kHz, 8 Ω)
200 mV, 50 kΩ (CD)
2.5 mV, 50 kΩ (PHONO MM)
200 mV, 2.2 kΩ (REC OUT)
70 mV (MM, 1 kHz, 0.5 %)
10 Hz–60 kHz, +1 dB–3 dB (CD)
+10 dB, –10 dB, 100 Hz (BASS)
+10 dB, –10 dB, 20 kHz (TREBLE)
+10 dB, 50 Hz (LOUDNESS)
+2 dB, 10 kHz (LOUDNESS)
100 dB (CD, IHF-A)
2.5 mV, 50 kΩ (PHONO MM)
200 mV, 2.2 kΩ (REC OUT)
70 mV (MM, 1 kHz, 0.5 %)
10 Hz–60 kHz, +1 dB–3 dB (CD)
+10 dB, –10 dB, 100 Hz (BASS)
+10 dB, –10 dB, 20 kHz (TREBLE)
+10 dB, 50 Hz (LOUDNESS)
+2 dB, 10 kHz (LOUDNESS)
100 dB (CD, IHF-A)
Output level and impedance:
Phono overload:
Frequency response:
Tone control:
SN ratio:
70 dB (PHONO, IHF-A)
70 dB (PHONO, IHF-A)
Speaker impedance:
4–16 Ω
4–16 Ω
Power supply:
AC 230-240 V, 50 Hz
AC 220-230 V, 50/60 Hz
AC 230-240 V, 50 Hz
AC 220-230 V, 50/60 Hz
AC 120 V, 60 Hz
120 W
0.3 W
435 × 148 × 431 mm
13.0 kg
Power consumption:
Stand-by power consumption:
Dimensions (W × H × D):
Weight:
125 W
0.3 W
435 × 144 × 431 mm
17.6 kg
Analog inputs:
PHONO, CD, TUNER,
PHONO, CD, TUNER,
TAPE, MD, HDD, LINE, MAIN IN
TAPE, MD, HDD, LINE,
Analog outputs:
Speaker outputs:
Phones:
MD, TAPE
2 (A, B)
1
MD, TAPE
2 (A, B)
1
Specifications and features are subject to change without notice.
Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN
Tel: 072-831-8023 Fax: 072-831-8124
ONKYO U.S.A. CORPORATION
18 Park Way, Upper Saddle River, N.J. 07458, U.S.A.
ONKYO EUROPE ELECTRONICS GmbH
Liegnitzerstrasse 6, 82194 Groebenzell, GERMANY
ONKYO EUROPE UK Office
Suite 1, Gregories Court, Gregories Road, Beaconsfield, Buckinghamshire, HP9 1HQ
UNITED KINGDOM Tel: +44-(0)1494-681515 Fax: +44(0)-1494-680452
HOMEPAGE
ONKYO CHINA LIMITED
Units 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung,
N.T., HONG KONG Tel: 852-2429-3118 Fax: 852-2428-9039
Printed in Japan
D0510-1
SN 29344108
(C) Copyright 2005 ONKYO CORPORATION Japan. All rights reserved.
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