Onkyo Stereo Amplifier A 9755 User Manual

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  
 
Precautions  
1. Recording CopyrightUnless its 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  
qualied service personnel.  
2. AC FuseThe 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. CareOccasionally 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. Dont use abrasive cloths, thin-  
ners, alcohol, or other chemical solvents, because  
they may damage the nish 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 units 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 tted 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 cords plug is not suitable for your socket  
outlets, cut it off and t 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 HandsNever  
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 units 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
 
Table of Contents  
Features  
A-9755 Integrated Digital Amplier  
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 Amplier  
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
 
Supplied Accessories  
Make sure you have the following accessories:  
Remote controller & two batteries (AA/R6)  
Installing the Remote Controllers  
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. Specications 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  
rst.  
Notes:  
If the remote controller doesnt work reliably, try  
replacing the batteries.  
Dont 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
 
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 amplier 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 ashes while the sound is muted. It  
ashes more quickly if any of the speakers is left  
unconnected.  
6
 
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 turntables ground  
wire.  
This analog audio input is for connecting a compo-  
nents 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 amplier.  
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-9555s remote control-  
ler can then be used to control all of your compo-  
This analog audio input is for connecting a CD  
players 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 tuners  
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 1013 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-  
nents analog audio output (RI Dock, etc.).  
7
 
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
 
Remote Controller—Continued  
SELECT button: Conrms 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 uorescent lights.  
Keep this in mind when installing.  
P ENTER button  
This button is used to conrm 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.  
Dont 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 theres an  
obstacle between it and the A-9755/A-9555s 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, theyre 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
 
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 ash 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.  
Dont connect more than one  
cable to each speaker termi-  
nal. Doing so may damage  
the A-9755/A-9555.  
Dont connect a speaker to more than one pair of  
speaker terminals.  
A-9755/A-9555  
+
+
Right  
speaker  
Left  
speaker  
Speaker set B  
10  
 
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 tuners 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-9555s 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-9555s CD L/R jacks to the analog audio out-  
put jacks on the CD player, as shown.  
A-9755/A-9555s 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-9555s 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, youll need a commercially available MC  
phono preamp. In this case, connect the turntable to  
the phono preamps input, and connect the phono  
preamps output to the A-9755/A-9555s PHONO  
L/R jacks.  
11  
 
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-9555s 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-9555s HDD IN L/R jacks to the RI Docks  
analog audio output jacks, and use an  
cable to con-  
nect the A-9755/A-9555s  
jack to the RI Docks  
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-9555s TAPE IN L/R jacks to the cassette  
decks analog audio output jacks, and use another ana-  
log audio cable to connect the A-9755/A-9555s TAPE  
OUT L/R jacks to the cassette decks analog audio input  
jacks, as shown.  
Note:  
If you use the Onkyo Remote Interactive Dock (DS-  
A1), ip the RI MODE switch to HDDwhich 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-9555s 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-9555s MD IN L/R jacks to the MD  
recorders analog audio output jacks, and use another  
analog audio cable to connect the A-9755/A-9555s MD  
OUT L/R jacks to the MD recorders 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  
 
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-9555s remote controller.  
The A-9755 can be used as a power amplier with a  
separate preamp.  
In this case, use an analog audio cable to connect the  
A-9755s MAIN IN jacks to the preamps 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. Theyre all  
When you turn on the power or start playback on a com-  
ponent thats 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-9555s 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 manufacturers  
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 amplier (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-9555s remote controller. See page 8 for  
more information.  
13  
 
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 Aposition.  
B: To output sound from the speakers connected to the  
SPEAKERS B terminals, turn the SPEAKERS selector  
to the Bposition.  
Press the [POWER] switch.  
The A-9755/A-9555 retains the power  
mode (on/standby) in which the ampli-  
er 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 rst 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+Bposition.  
Note:  
If the Volume indicator ashes quickly, make sure that  
the speakers are connected correctly.  
(
) position, the A-9755/A-9555  
will turn on.  
When its turned on, the  
A-9755/A-9555 outputs no sound  
for about ve 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 controllers [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 controllers [ON] button. To do this, turn on the  
A-9755/A-9555, and then press and hold the remote con-  
trollers [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-  
trollers [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 reseton page 19.  
14  
 
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 controllers  
[MUTING] button.  
1
The A-9755/A-9555 is muted. The  
Volume indicator ashes.  
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 controllers VOLUME  
buttons are pressed or the  
A-9755/A-9555 is set to Standby.  
When using the A-9755 as a power  
amplier (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-9555s 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-9555s Volume control,  
or the remote controllers 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  
amplier (MAIN IN function), the  
Volume control has no effect.  
15  
 
Enjoying Audio Sources—Continued  
Using the Tone Controls  
Loudness Control  
While the MAIN IN function is on, the A-9755s 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 amplier (MAIN  
IN function), the Loudness control doesnt 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  
 
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 amplier 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 its ready for  
recording.  
If necessary, adjust the recording  
level on the recorder.  
See the recorders 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-9755s 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 thats 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 amplier (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.  
17  
 
Troubleshooting  
If you have any trouble using the A-9755/A-9555, look for a solution here. If you cant resolve the issue yourself,  
contact your Onkyo dealer.  
Power  
Cant 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 controllers [ON] button once does not turn on all of the system components. You  
need to press the remote controllers [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 ashing.  
The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately and contact  
your Onkyo dealer.  
Audio  
Theres no sound or its very quiet.  
When the A-9755 is used as a power amplier (MAIN IN indicator lights up), the sound from components connected  
to the preamp is output. To output the sound from a component thats 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 ashes slowly, press the remote controllers [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 ashes 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 congured correctly. If OFFis 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 dont 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 doesnt work.  
Make sure that the batteries are installed with the correct polarity (page 5).  
Install new batteries. Dont 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 theres no obstruction  
between the remote controller and the A-9755/A-9555s remote control sensor (page 9).  
Make sure that the A-9755/A-9555 is not subjected to direct sunshine or inverter-type orescent 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).  
Cant control other components?  
If its an Onkyo component, make sure that the  
only an cable wont work. (page 13)  
cable and analog audio cable are connected properly. Connecting  
18  
 
Troubleshooting—Continued  
Recording  
Cant record.  
The component connected to the MAIN IN jacks cannot be recorded.  
When using the A-9755 as a power amplier (MAIN IN function), recording is not possible.  
Others  
The Volume control has no effect.  
When using the A-9755 as a power amplier (MAIN IN function), the Volume control has no effect. Adjust the  
volume on the connected preamp instead.  
The Muting function doesnt work.  
When using theA-9755 as a power amplier (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 units 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  
19  
 
Specications  
A-9755  
A-9555  
Power output:  
150 W + 150 W (8 , 1 kHz, DIN)  
300 W + 300 W (4 , 1 kHz, JEITA)  
330 W + 330 W (3 , Front)  
270 W + 270 W (4 , Front)  
170 W + 170W (8 , Front)  
0.08 % (1 kHz, 1 W)  
100 W + 100 W (8 , 1 kHz, DIN)  
200 W + 200 W (4 , 1 kHz, JEITA)  
230 W + 230 W (3 , Front)  
200 W + 200W (4 , Front)  
120 W + 120W (8 , Front)  
0.08 % (1 kHz, 1 W)  
Dynamic power:  
THD (total harmonic distortion):  
Damping factor:  
Input sensitivity and impedance:  
25 (Front, 1 kHz, 8 )  
200 mV, 50 k(CD)  
25 (Front, 1 kHz, 8 )  
200 mV, 50 k(CD)  
2.5 mV, 50 k(PHONO MM)  
200 mV, 2.2 k(REC OUT)  
70 mV (MM, 1 kHz, 0.5 %)  
10 Hz60 kHz, +1 dB3 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 k(PHONO MM)  
200 mV, 2.2 k(REC OUT)  
70 mV (MM, 1 kHz, 0.5 %)  
10 Hz60 kHz, +1 dB3 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:  
416 Ω  
416 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
Specications 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  
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.  
* 2 9 3 4 4 1 0 8 *  
 

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