XINDAK XA8800MNE User manual

CLASS A POWER AMPLIFIER
XA8800MNE
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
XA8800MNE
Marking by the "CE" symbol (shown left) indicates compliance of this
device with the EMS (Electrornagnetic Compatibility) and LVD (low
voltage directive) standards of the European Community.
CAUTION
!
!

2
Chapter 1
1.1 Before Use
Important Safety Instruction
Unpack your XA8800MNE 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 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. AC power cord × 1 2. User manual (This manual)
1.2 Check Accessory
XA8800MNE

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The circuit features of XA8800MNE
Designed as a separate mono-channel structure,XA8800MNE is a full symmetrical current negative
feedback Class A amplifier. The main circuit theory and technical features are as following:
The input buffering amplifying stage adopts fast and wide-frequency amplifying circuit with cross coupling compensatory
structure. It could connect the push-pull amplifying dynatron as Darlington circuit and control base current at a low level,
ensuring the stabilization of the middle point voltage. Meanwhile, the adoption of transistor Constant Current Source as
load ensures the steady and liable work on the stage.
Darlington complex structure on the Voltage amplifying stage not only ensures enough voltage gain but also raises the
input impedance to reach excellent match between the different stages. Besides, the adoption of Cascode circuit offers a
good solution of the effect on the high frequency by the transistor junction capacitance. Thus the frequency width could
be raised, the output characteristic curve of the bipolar transistor could be improved, the distortion of this stage could be
reduced and high stabilization could be achieved.
On the current drive stage, it adopts high power FET to supply drive current for the end stage. The parallel output
transistors on the end stage could reduce the output impedance, increase the output power, and improve the load
capability with low resistor. The static working current of 6 pairs high power transistors on the end stage as parallel output
is about 300mA and each transistor works in the special linear area where current is higher. This could eliminate
crossover distortion and switch distortion efficiently and reduce the output impedance. Equipped with impedance
compensatory network including L, Rs, Rz and C on the output terminal, the load of this unit will be closer to pure resistor
and difficult to cause self-excitation. Meanwhile, it could afford bigger damp to enhance the controlling ability of this unit to
the loudspeaker.
In order to ensure the middle point voltage of this unit approximately to be zero, high quality operating amplifying
components, high frequency non-inductance resistor, silver isinglass capacitance and so on are put to good use to the
loop current servo feedback circuit.
As for the power supply for the complete unit, each channel adopts 600W high quality annular transformer while the other
parts adopts winding group on the power supply separately. Additionally the power supply for the power amplifying,
voltage amplifying and protecting circuit are separated: the power supply for the power amplifying part is equipped with
50A bridge rectifier and 60,000 microfarad Rubycon filtering capacitance and supplies power directly after commutating
and filtering; the power supply for the voltage amplifying adopts stable power supply with fast speed, low noisy, low
impedance and strong ability to avoid the “ripple” to avoid the modulating disturbance caused by fluctuation of the power
on the following stage and make the sound purer.
Additionally, this unit adds protection functions, including power-on delay concussion protection, zero point floating on
the output terminal, over current and over voltage of the power transistor protection. In order to avoid the noisy when
power-off, this circuit adds transient release circuit, power-on delay circuit and glittering indicating circuit for protection to
make this unit more intellective.
2.1 Product Features
Introduction
Chapter 2
XA8800MNE
E E

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u v w x y
COAX.INPU T
u v
The power supply on-off button
Press this button, the current will be put through; press it again, the current will be cut off.
u
vPower Indicator
After getting through, this indicator will wink for 8 seconds and then light.
u
Signal input jack
Connect the input signal by signal cable.
v
The speaker binding post
Connect it to the speaker by the speaker cable.
w
Power supply input jack and safety cutout jack
Connect it to the power supply by attached power cord.
xSignal Input Switch
Switch between the coaxial and balance input channel
y
Balance signal input jack
Connect the input signal by the balanced signal cable.
Introduction
Chapter 2
XA8800MNE
2.3 Rear Panel
2.2 Front Panel
E

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COAX.INPUT COAX.INPUT
XA8800MN
Power Amplifier
XA8250 Pre-Amplifier
Operation Instruction
Chapter 3
3.1 Connection
XA8800MNE
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.
!!
Left Channel
Connection to
Power Supply
Right Channel

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Operation Instruction
Chapter 3
XA8800MNE
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.
Speaker no
sound
Sound source turned off
Signal cable is broken
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
Speaker cable is broken
Noise too big
Left and
right channel
confused
Turn on the sound source.
Check and change signal cable.
Check and change speaker cable.
Change a higher SNR sound.
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.

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Unit: mm
Chapter 4
4.1 Dimensions
Specifications
XA8800MNE
E

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Chapter 4 Specifications
XA8800MNE
4.2 Specifications
* All specifications, dimensions and weights are subject to change without notice.
< Power output
ower consumption
< Frequency response
< Signal-to-noise ratio
< Distortion (THD + noise)
< Dimensions (W*D*H)
< Input sensitivity
< Net weight
< Shipping weight
< Supply voltage
< P
200W/ch (8ohm Load)
4 4
400W
5Hz - 150KHz
108dB Typical(A Weight)
<0.025%
305mm*427mm*202mm
1.7V
24Kg
26.5Kg
Specified on rear panel decal
(cannot be changed by user or dealer)
00W/ch ( ohm Load)

XD3.834.049 SMS
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