Integrated Amplifier
A-9755/A-9555
Instruction Manual
Contents
Introduction.................................... 2
Connections ................................. 10
Thank you for purchasing an Onkyo Integrated Amplifier. 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.
Enjoying Audio Sources.............. 14
Troubleshooting........................... 18
Specifications ......Back cover page
E
n
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPARATUS
TO RAIN OR MOISTURE.
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.
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding
type plug has two blades and a third grounding
prong. The wide blade or the third prong are provided for your safety. If the provided plug does not
fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the
manufacturer.
12.
Use only with the cart, stand,
tripod, bracket, or table specified by the manufacturer, or
sold with the apparatus.
When a cart is used, use caution when moving the
cart/apparatus combination
to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or
when unused for long periods of time.
14. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate
normally, or has been dropped.
PORTABLE CART WARNING
S3125A
WARNING
RISK OF ELECTRIC SHOCK
DO NOT OPEN
The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alert the user to 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.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in
the literature accompanying the appliance.
AVIS
RISQUE DE CHOC ELECTRIQUE
NE PAS
OUVRIR
15. Damage Requiring Service
Unplug the apparatus from the wall outlet and refer
servicing to qualified service personnel under the
following conditions:
A. When the power-supply cord or plug is dam-
aged,
B. If liquid has been spilled, or objects have fallen
into the apparatus,
C. If the apparatus has been exposed to rain or
water,
D. If the apparatus does not operate normally by
following the operating instructions. Adjust only
those controls that are covered by the operating
instructions as an improper adjustment of other
controls may result in damage and will often
require extensive work by a qualified technician
to restore the apparatus to its normal operation,
E. If the apparatus has been dropped or damaged in
any way, and
F. When the apparatus exhibits a distinct change in
performance this indicates a need for service.
16. Object and Liquid Entry
Never push objects of any kind into the apparatus
through openings as they may touch dangerous voltage points or short-out parts that could result in a
fire or electric shock.
The apparatus shall not be exposed to dripping or
splashing and no objects filled with liquids, such as
vases shall be placed on the apparatus.
Don’t put candles or other burning objects on top of
this unit.
17. Batteries
Always consider the environmental issues and follow local regulations when disposing of batteries.
18. If you install the apparatus in a built-in installation,
such as a bookcase or rack, ensure that there is adequate ventilation.
Leave 20 cm (8") of free space at the top and sides
and 10 cm (4") at the rear. The rear edge of the shelf
or board above the apparatus shall be set 10 cm (4")
away from the rear panel or wall, creating a flue-like
gap for warm air to escape.
2
Precautions
1. Recording Copyright —Unless it’s for personal use
only, recording copyrighted material is illegal without the permission of the copyright holder.
2. AC Fuse
serviceable. If you cannot turn on the unit, contact
your Onkyo dealer.
3. Care
over with a soft cloth. For stubborn stains, use a soft
cloth dampened with a weak solution of mild detergent and water. Dry the unit immediately afterwards
with a clean cloth. Don’t use abrasive cloths, thinners, alcohol, or other chemical solvents, because
they may damage the finish or remove the panel lettering.
4. Power
WARNING
BEFORE PLUGGING IN THE UNIT FOR THE
FIRST TIME, READ THE FOLLOWING SECTION 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).
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—
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.
6. Handling Notes
• If you need to transport this unit, use the original
• Do not leave rubber or plastic items on this unit
• This unit’s top and rear panels may get warm
• If you do not use this unit for a long time, it may
—The AC fuse inside the unit is not user-
—Occasionally you should dust the unit all
Never
packaging to pack it how it was when you originally bought it.
for a long time, because they may leave marks on
the case.
after prolonged use. This is normal.
not work properly the next time you turn it on, so
be sure to use it occasionally.
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.
IMPORTANT
The wires in the 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
apparatus may not correspond with the coloured markings 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.
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.
For European Models
Declaration of Conformity
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
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
Connections
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
Connecting Components ............. 13
Enjoying Audio Sources
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
Others
Troubleshooting...................................... 18
Specifications.......................................... 20
Features
A-9755 Integrated Digital Amplifier
150 W/Ch into 8 ohms, DIN/300 W/Ch into 4
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
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
Compatible with RI Dock for the iPod
RI (Remote Interactive) Remote Control
A-9555 Integrated Digital Amplifier
100 W/Ch into 8 ohms, DIN/200 W/Ch into 4
ohms, JEITA
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
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
4
Supplied Accessories
Make sure you have the following accessories:
Remote controller & two batteries (AA/R6)
A-9755: RC-636S
A-9555: RC-627S
Power cord
(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.
Installing the Remote Controller’s
Batteries
To open the battery compartment, press
1
the small hollow and slide open the cover.
Insert the two supplied batteries (AA/R6)
2
in accordance with the polarity diagram
inside the battery compartment.
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.
DO NOT connect the
power cord at this
time.
To wall outlet
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.
5
Front & Rear Panels
Front Panel
4 5 6 7908AB12 C3
For detailed information, refer to the pages in parentheses.
(A-9755 only)
This illustration is for A-9755.
A
POWER switch (14)
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.
STANDBY indicator (14)
B
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).
C
PHONES jack (15)
This phone jack is for connecting a standard pair of
stereo headphones for private listening.
D
SPEAKERS selector (14)
This control is used to select which speaker set outputs sound. You can switch the output speaker set
between four options: OFF, A, B and A+B.
E
BASS control (16)
This control is for adjusting the level of bass
sounds.
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 function is on.
Volume control and indicator (15)
H
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.
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.
POWER AMP DIRECT (MAIN IN) button and
J
indicator (17) (A-9755 only)
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.
K Input selector (15)
This control is used to select from the following
input sources: LINE, HDD, PHONO, CD, TUNER,
TAPE, or MD.
L Input selector indicator (15)
These indicators show the currently selected input
source.
M Remote control sensor (9)
This sensor receives control signals from the remote
controller.
6
Front & Rear Panels—Continued
Rear Panel
1 2 4 53
87 90ABC6
(A-9755 only)
A Grounding terminal
This terminal is for connecting a turntable’s ground
wire.
B PHONO (MM) input
This analog audio input is for connecting a turntable
with a moving-magnet cartridge.
C SPEAKERS A
These terminal posts are for connecting speaker set
A.
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).
F CD input
This analog audio input is for connecting a CD
player’s analog audio output.
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 connecting a cassette deck with an analog audio input and
output.
I MD IN/OUT
This analog audio input and output are for connecting an MD recorder with an analog audio input and
output.
J HDD IN
This analog audio input is for connecting a component’s analog audio output (RI Dock, etc.).
This illustration is for A-9755.
K LINE input
This analog audio input is for connecting a component’s analog audio output (TV, etc.).
L MAIN IN (A-9755 only)
This analog audio input is for connecting a separate
preamp when you want to use the A-9755 as a
power amplifier.
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 volume and may damage the A-9755 and your speakers.
M REMOTE CONTROL jacks
These (Remote Interactive) jacks can be connected 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-
nents. To use , you must make an analog audio
connection between the A-9755/A-9555 and each
component.
See pages 10–13 for connection information.
7
Remote Controller
1
2
3
4
5
6
7
8
9
0
A
B
8
C
D
E
F
G
H
I
J
K
L
M
Note that the buttons with parenthesized numbers control the A-9755/A-9555, while the buttons without
parenthesized numbers control other Onkyo products
connected to the A-9755/A-9555 via connection.
Note also that some of the connected products may
not be controlled with these buttons. For detailed information, refer to the relevant manuals provided for the
individual products.
A STANDBY button (14)
This button is used to set the A-9755/A-9555 to
Standby.
B ON button (14)
This button is used to turn on the A-9755/A-9555.
C Number buttons
These buttons are used to enter track numbers on a
CD or MD component. To enter a single-digit number, 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.
See the instruction manual supplied with each component for more information.
D TUNER buttons
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.
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 function on a CD, MD, or HDD component. On a cassette deck, the button is used to switch the DOLBY
mode.
Remote Controller—Continued
J REPEAT button
This button is used to set the repeat playback functions on a CD, MD, or HDD component. On a cassette deck, the button is used to switch the repeat
playback mode (single side only/both sides).
K PLAYLIST [ ]/[ ] buttons
Selects a playlist stored on the player on an HDD
component.
L ALBUM [ ]/[ ] buttons
Selects an album stored on the player on an HDD
component.
M PLAY MODE button
This button sets the playback mode on an MD component.
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.
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.
P ENTER button
This button is used to confirm the settings on a CD
or MD component.
Q CLR button
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.
S DISPLAY button
This button is used to change the information displayed on a CD or MD component. When the input
source is “HDD,” this button turns on the display
backlight on the HDD component.
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 forward.
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.
SELECT button: Confirms the option on the HDD
component menu.
[]/[] buttons: Selects the option on the HDD
component menu.
Using the Remote Controller
Point the remote controller toward the remote control
sensor.
Remote control sensor
About 5 m
(16 feet)
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.
• 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.
• Don’t put anything, such as a book, on the remote controller, because the buttons may be pressed inadvertently, 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.
• The remote controller will not work if there’s an
obstacle between it and the A-9755/A-9555’s remote
control sensor.
9
Connecting the A-9755/A-9555
Connecting Your Speakers
Speaker Connection Precautions
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 available. If the electrical contact is poor for the connection,
the Volume indicator will flash quickly when the power
is supplied.
• 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 negative (–) terminals. If you get them the wrong way
around, the sound will be out of phase and will sound
unnatural.
• 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 terminal. Doing so may damage
the A-9755/A-9555.
• Don’t connect a speaker to more than one pair of
speaker terminals.
Connecting the Speaker Cables
Strip about 15 mm (5/8
1
inch) of insulation from
the ends of the speaker
cables, and twist the bare
wires tightly, as shown.
Unscrew the terminal.
2
Fully insert the bare
3
wires.
Screw the terminal tight.
4
The following illustration shows which speaker should
be connected to each pair of terminals.
Right
speaker
Speaker set A
+–
A-9755/A-9555
15 mm
(5/8")
Left
speaker
+–
10
+– +–
Right
speaker
Speaker set B
Left
speaker
Connecting the A-9755/A-9555—Continued
Before Making any Connections
• Always refer to the instructions that came with the
component that you are connecting.
• Do not plug in the power cord until all connections have been properly made.
• Do not bind audio cables with power cords and
speaker cables. Doing so may adversely affect the
sound quality.
• To prevent interference, keep power cords and
speaker cables away from the tuner’s antenna.
Audio Components
Connecting a Turntable
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
A-9755/A-9555’s PHONO L/R jacks to the audio output jacks on the turntable, as shown.
RCA Audio Connection Color Coding
• Red connectors are used for the right channel, and
white connectors are used for the left channel.
Left (white)
Right (red)
L
R
• Push each plug in all the way to make a good connection (loose connections can cause noise or
malfunctions).
Right!
Wrong!
Connecting a CD Player
Use an analog audio cable to connect the
A-9755/A-9555’s CD L/R jacks to the analog audio output jacks on the CD player, as shown.
AUDIO OUT
Ground wire
Notes:
• If the turntable has a ground wire, connect it to
A-9755/A-9555’s GND terminal. With some turntables, connecting the ground wire may cause hum, in
which case it should be disconnected.
• If the turntable has a moving-coil (MC) type cartridge, 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.
ANALOG
OUT
11
Connecting the A-9755/A-9555—Continued
Connecting a Tuner
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.
OUT
Connecting a Cassette Deck
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 analog 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.
Connecting a Remote Interactive Dock
(RI Dock)
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 connect the A-9755/A-9555’s jack to the RI Dock’s
jack, as shown.
Remote Interactive
Dock
Note:
If you use the Onkyo Remote Interactive Dock (DSA1), flip the RI MODE switch to “HDD” which is
located on the underside.
----
R
AUDIO OUT
L
/
REC
PLAY
(IN)
(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.
Connecting a TV 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.
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.
12
REC
PLAY
(IN)
(OUT)
Connecting the A-9755/A-9555—Continued
Connecting a Preamp (A-9755 only)
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.
PRE OUT
Notes:
• Do not connect a component that does not have an
output volume control, because the sound will be output 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).
With (Remote Interactive), you can control your
-compatible Onkyo CD player, Tuner, and so on
with the A-9755/A-9555’s remote controller.
• 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
Onkyo CD player
(DX-7555), etc.
Onkyo cassette
deck, etc.
connector
connector
Connecting Components
If you connect other Onkyo components to the
A-9755/A-9555 with the appropriate and audio
cables, you can use the following system functions.
cables are special cables solely for use with Onkyo
products (no cables are supplied with the
A-9755/A-9555).
Auto Power On
When you turn on the power or start playback on a component 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).
Direct Change
When playback is started on an audio component connected via , the A-9755/A-9555 will automatically
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.
Remote Interactive
Dock, etc.
Remote control cable
Notes:
• Push each plug in all the way to make a good connection.
• Use only dedicated cables for connections
(no cables are supplied with the
A-9755/A-9555).
• The A-9755/A-9555 has two jacks. They’re all
the same, so you can use either of them.
• jacks should be connected only to Onkyo components. Connecting them to another manufacturer’s
component may cause the A-9755/A-9555 to malfunction.
• 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
function), the system functions are unavailable.
13
Enjoying Audio Sources
Turning On the A-9755/A-9555
POWER
A-9755/
1
A-9555
STANDBY
indicator
Press the [POWER] switch.
The A-9755/A-9555 retains the power
mode (on/standby) in which the amplifier was the last time you turned off the
system.
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
( ) 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.
Note:
To shut down the A-9755/A-9555 completely, set the
[POWER] switch to the OFF position ( ).
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.
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.
Remote
2
controller
If the A-9755/A-9555 is connected to other components 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 controller’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 system components with just one press of the remote controller’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.
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.
The STANDBY indicator goes off.
14
Enjoying Audio Sources—Continued
Listening to Components
VolumeSPEAKERS selector
VOLUME
/
1
2
3
A-9755/
A-9555
Remote
controller
A-9755/
A-9555
Remote
controller
Turn the input selector to select
the component that you want to
listen to.
LINE: Select to listen to the component connected to the LINE jacks.
HDD: Select to listen to the component connected to the HDD jacks.
PHONO: Select to listen to the turntable connected to the PHONO jacks.
CD: Select to listen to the component
connected to the CD jacks.
TUNER: Select to listen to the component 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 [ ]/[ ] buttons.
Start playback on the selected
component.
To adjust the volume, use the
A-9755/A-9555’s Volume control,
or the remote controller’s VOL-
UME [ ]/[ ] buttons.
Turn Volume control clockwise to
increase the volume or counterclockwise to decrease the volume.
Note:
When using the A-9755 as a power
amplifier (MAIN IN function), the
Volume control has no effect.
Input selector
INPUT
/
MUTING
Muting the A-9755/A-9555 (remote
controller only)
You can temporarily mute the output of the
A-9755/A-9555.
1
Press the remote controller’s
[MUTING] button.
The A-9755/A-9555 is muted. The
Volume indicator flashes.
To unmute the A-9755/A-9555,
press the [MUTING] button again.
Notes:
• 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.
Using Headphones
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.
Notes:
• Always turn down the volume before connecting your
headphones.
• All connected speakers are turned off while the headphones plug is inserted in the PHONES jack.
• The headphones output no sound while the MAIN IN
function is on.
15
Enjoying Audio Sources—Continued
Using the Tone Controls
While the MAIN IN function is on, the A-9755’s tone
controls have no effect.
PURE DIRECT
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 controls 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.
Loudness Control
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.
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 Loudness control is disabled.
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
Enjoying Audio Sources—Continued
Using the MAIN IN Function (A-9755
only)
You can use the A-9755 as power amplifier with a separate preamp. See page 13 for connection information.
POWER AMP DIRECT (MAIN IN)
1
Press the [POWER AMP DIRECT
(MAIN IN)] button for 3 seconds
until the MAIN IN indicator lights up.
The MAIN IN function comes on and
the MAIN IN indicator lights up.
While the MAIN IN function is on,
only audio from components connected 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.
Notes:
• Do not connect a component that
does not have an output volume control to the MAIN IN jacks and use the
MAIN IN function, because the
sound will be output at maximum
volume and may damage the A-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:
- Volume control
- Input selector
- Remote control operation
- 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 controller will work even when the MAIN
IN function is on.
Recording
Unless you have the full consent of the
copyright holder, copyright laws prohibit
using your recordings for anything other
than personal enjoyment!
Input selector
1
2
3
Notes:
• 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.
Use the input selector to select
the component that you want to
record from.
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.
Start playback on the component
selected in step 1.
Note:
If you select another input source during recording, the newly selected input
source will be recorded.
17
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 the Volume 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 performance, 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 cable and analog audio cable are connected properly. Connecting
only an cable won’t work. (page 13)
18
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 the A-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
PHONO
CD
TUNER
TAPE
MD
HDD IN
LINE
OUT
OUT
SELECTOR
VOLUME
BASS,
IN
IN
TREBLE
PURE DIRECT
BASS, TREBLE
ON
OFF
ON
OFF
MAIN IN
POWER
AMP
DIRECT
MAIN IN
A-9755 ONLY
ON
OFF
OFF
ON
DIGITAL
AMPLIFIER
L-ch
SPEAKER B
RELAY
R-ch
DIGITAL
AMPLIFIER
LOW PASS
FILTER
LOW PASS
FILTER
SPEAKER
A
RELAY
SPEAKER
SPEAKER
A
B
19
Specifications
A-9755
Power output: 150 W + 150 W (8 Ω, 1 kHz, DIN)
300 W + 300 W (4 Ω, 1 kHz, JEITA)
Dynamic power: 330 W + 330 W (3 Ω, Front)
270 W + 270 W (4 Ω, Front)
170 W + 170W (8 Ω, Front)
THD (total harmonic distortion): 0.08 % (1 kHz, 1 W)
Damping factor: 25 (Front, 1 kHz, 8 Ω)
Input sensitivity and impedance: 200 mV, 50 kΩ (CD)
2.5 mV, 50 kΩ (PHONO MM)
Output level and impedance: 200 mV, 2.2 kΩ (REC OUT)
Phono overload: 70 mV (MM, 1 kHz, 0.5 %)
Frequency response: 10 Hz–60 kHz, +1 dB–3 dB (CD)
Tone control: +10 dB, –10 dB, 100 Hz (BASS)
+10 dB, –10 dB, 20 kHz (TREBLE)
+10 dB, 50 Hz (LOUDNESS)
+2 dB, 10 kHz (LOUDNESS)
SN ratio: 100 dB (CD, IHF-A)
70 dB (PHONO, IHF-A)
Speaker impedance: 4–16 Ω
Power supply: AC 230-240 V, 50 Hz
AC 220-230 V, 50/60 Hz
Power consumption: 125 W
Stand-by power consumption: 0.3 W
Dimensions (W × H × D): 435 × 144 × 431 mm
Weight: 17.6 kg
A-9555
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)
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)
70 dB (PHONO, IHF-A)
4–16 Ω
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
Analog inputs: PHONO, CD, TUNER,
TAPE, MD, HDD, LINE, MAIN IN
Analog outputs: MD, TAPE
Speaker outputs: 2 (A, B)
Phones: 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.
Tel: 201-785-2600 Fax: 201-785-2650 http://www.us.onkyo.com/
ONKYO EUROPE ELECTRONICS GmbH
Liegnitzerstrasse 6, 82194 Groebenzell, GERMANY
Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/
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
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
http://www.ch.onkyo.com/
PHONO, CD, TUNER,
TAPE, MD, HDD, LINE,
MD, TAPE
2 (A, B)
1
HOMEPAGE
http://www.onkyo.com/
Printed in Japan
D0510-1
SN 29344108
(C) Copyright 2005 ONKYO CORPORATION Japan. All rights reserved.
20
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