XINDAK XA8550 User manual

POWER AMPLIFIER
XA8550
INSTRUCTIONS
®

1
Chapter 1 Important Safety Instruction
The lightning flash with arrowhead symbol, within an equilateral triangle,
is intended to alert the user to 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.
Dangerous Voltage
The exclamation point within an equilateral triangle is intended to alert the
user to presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
Important Instructions
Marking by the "CE" symbol indicates compliance of this device with
the EMS (Electrornagnetic Compatibility) and LVD (low voltage
directive) standards of the European Community.
!
XA8550
!

2
Chapter 1
1.1 Before Use
Important Safety Instruction
Unpack your XA8550 power amplifier and keep all packing materials for future transport or service, locate and remove
all accessory items from the accessory box within the controller shipping carton.
Accessories Included:
Please read all instructions and precautions carefully and completely before operating your XA8550 power amplifier.
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. Always keep this unit out of the reach of children.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus ( including amplifiers) that
produce heat.
9. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they
exit from the apparatus.
10. Unplug this apparatus during lightning storms or when unused for a long time.
11. Always disconnect your entire system from the AC mains before connecting or disconnecting any cable, or when cleaning any
component.
12. This product must be terminated with a three conductor AC mains power cord which includes an earth ground connection, to
prevent shock hazard, all three connections must always be used.
13. AC extension cords are not recommended for use with this product.
14. Never use flammable or combustible chemicals for cleaning audio components.
15. Never operate this product with any cover removed.
16. Never pour or spill liquids directly onto this unit.
17. Never block air flow through ventilation slots or heat sinks.
18.Never by pass any fuse.
19. Never replace any fuse with a value or type other than those specified.
20. Never attempt to repair this product, if a problem occurs, contact your dealer.
21. Never expose this product to extremely high or low temperatures.
22. Never operate this product in an explosive atmosphere.
1.2 Check Accessory
XA8550
1. AC power cord × 1 2. Remote controller × 1 3. AAA batteries × 2 4. User manual (This manual)

3
XA8550 is a Dual Channel Power Amplifier. The appearance is both simple and elegant. Besides, the
sound of this unit is fast with high analysis ability and full musical taste on the base of good balance.
The circuit features of this unit are as following:
Power Amplifying Circuit
The power amplifying circuit of the power stage is the classical current negative feedback circuit with
full symmetrical and full complementary structure which is well appraised in audio field. The main
advantages of this circuit are low distortion, wide dynamic range, good controlling ability, steady work
and euphonic tone color. The current amplifying circuit is three-stage Darlington circuit, whose first
stage adopts MJE350/MJE340 geminate transistors and second stage adopts Toshiba
2SC517/2SA1930 geminate transistors. The output transistors are three pairs of SANKEN
2SC3264/2SC1295 high current geminate transistors. Thus this amplifier has powerful drive. Power
Supply System
This unit adopts two 300W annular transformers as power supply, so 600W power in total. Besides,
the rectifiers are 50A/400V bridge rectifiers. The main power supply filtering capacitances are
82000uF/63V Rubycon electrolytic capacitances.
RCA input port
The two pairs of RCA ports are parallel connected. When there is signal on the input ports, on the
output ports the signal could be transmitted to the bass or to the second amplifier to achieve the partial
tone on bi-amplifiers.
Output port
Considering the special connecting way for partial tone, two pairs of output ports for loudspeakers are
offered on each channel.
2.1 Product Features
Introduction
Chapter 2
XA8550
XA8550T

XA8550T
4
Introduction
Chapter 2
2.2 Front Panel & Rear Panel
XA8550
u v
u
v
Power button
This button connects and disconnects the XA8550 from the AC mains power. By using the button to turn the
system on and off.
Power on indicator
When this unit is switched on, the indicator will glitter, which shows the system is in pre-heating model. About 5
seconds later, the indicator will stop glittering and keep light When the system is in protected model, the
indicator will be glittering all the time.
u
v
Audio Input
Connect the input signal by RCA.
Right Loudspeaker Binding Posts
To output the amplified audio signal and be
connected to the right channel speaker with
loudspeaker cable.
Power supply input jack
Connect it to the power supply by attached power
Cord.
w
Left Loudspeaker Binding Posts
To output the amplified audio signal and be
connected to the left channel speaker with
loudspeaker cable.
Signal Output
This output signal could be connected to the
loudspeaker or other amplifier.
Front Panel
Rear Panel
u
v
w x y
~
左
右
左
右
信号输出
!!
x
y

Operation Instruction
Chapter 3
3.1 Connection
XA8550
1.Before using this machine, you have to connect it to sound sources (such as CD player, DVD player, SACD player) by signal cable. Also
you need to check if the signal connection of the left and right channel is correct and reliable.
2.Before connecting the machine to the right and left channel speaker by speaker cables, it’s strongly suggested that you consult the
dealer if your speaker cable is available for this machine and make sure of the right channel and polarity.
3.Please be very careful when connecting the power cable. Make sure the power supply has been cut off before connecting to the
accessory power cable. If you do have to use other power cables, please check if the specifications are up to the requirements of this
machine. We claim that we are not reliable for the damages caused by the use of other power cables.
Please make sure all the power supplies have been cut off before connecting any
cable to this machine. If you have no ability to install this machine, please ask
those who are guided or are capable to accomplish the installation or connection.
!!
XA8550 Power Amplifier
Right Channel Loudspeaker
~
左
右
左
右
信号输出
L
R
L
R
Pre-Amplifier
S2
S3
S1
S4
Input
IR Sensor
Power
Volume
Max.
Min.
VACUUM TUBE PRE-AMPLIFIER XA3250
L
R
L
R
CD or SACD Player
Left Channel Loudspeaker
Output
Output Input
Connection to
Power Supply
5

6
Operation Instruction
Chapter 3
XA8550
3.2 General Problems and Trouble-shootings
Problem Possible cause Trouble-shootings
the machine is
not electrified
Power connector not plug well
Fuse has fused
Plug the power connector again.
Change the fuse coincide with the prompt
requirement.
There is no
sound
Sound source turned off
Signal cable is broken
The volume is turned down to the minimum
Signal selector switch wrong
Root noise of sound source too big
Signal shielding effect badly
Signal source input phase opposed
Speaker wire to channels has exchanged or
positive negative reversed
Noise too big
Left and
right channel
confused
Turn on the sound source.
Check and change signal cable.
Turn up the volume.
Replace the sound source with another
one with higher Signal to Noise Ratio.
Tune input selection button according to
sound source.
Connect according to the indication of left
and right channel.
Change eligible signal cable
Notice: if you have been confronted any problems when using this product or have any suggestion to tell us, please visit
the wesite of xindak: http://www.xindak.com, you may access our instant technique support here.

7
Unit: mm
Chapter 4
4.1 Dimensions
Specifications
XA8550
426mm
~
左
右
左
右
430mm
153mm

8
Chapter 4 Specifications
XA8550
4.2 Specifications
* All specifications, dimensions and weights are subject to change without notice.
< Power output
< Signal-to-noise ratio
< Audio Inputs
Distortion (THD + noise)
< Dimensions (W*D*H)
< Input sensitivity
< Net weight
< Supply voltage
< Frequency response
< Audio Outputs
<
130 watts pre channel at 8 ohm
250 watts pre channel at 4 ohm
10Hz - 100KHz (±1dB)
95dB Typical(A Weight)
one pair single-ended on RCA
one pair record outputs on RCA
two pairs speaker binding posts pre channel
<0.05%
430mm*426mm*153mm
1.8V
22.5Kg
Specified on rear panel decal
(cannot be changed by user or dealer)

No.126, Section 2, East 1 Round Chengdu, Sichuan, China P.C. 610051
You can find your nearest authorized distributor and more product information on our website:
www.xindak.com