Owner's Manual
Thank you for purchasing the A502 amplifier.
Please read this Owner's Manual before use.
Be particularly sure to read the Safety Instructions section.
Keep this Owner's Manual together with the Warranty in a safe place for later reference.
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■Contents
■Accessories
Foreword
Important Safety Instructions ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯3
Notes on Use⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯6
Part Names and Functions/Connections ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7
Specifications ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯8
①Amplifier x1 ⑤Warranty x1
②Volume knob x1
③Power supply x1
④Owner's Manual x1
WARNING : To avoid the danger of suffocation, keep plastic bags out of the reach of
children.
＊This product is an amplifier which has been designed using time domain theory in
order to maximize speaker operation and performance.
《What is time domain theory?》
Time domain recreates the changes that occur in sound waves over time from the
moment of output until their disappearance. Its purpose is to reproduce those
sound waves that are as close as possible to the original recorded sound.
Time domain audio systems allow sound orientation and the nuances that are
added by recorded performers to be faithfully reproduced.
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Important Safety Instructions
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CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE TO
RAIN OR MOISTURE.
・Explanation of Graphical Symbols
The lightning flash with arrowhead
symbol, within an equilateral triangle,
is intended to alert you 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
you to the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the appliance.
CAUTION(for customers who concerned)
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE
OF PLUG TO WIDE SLOT FULLY INSERT.
1. Read instructions
All safety and operating instructions should be
read before operating unit.
2. Follow instructions
All operating and other instructions should be
followed.
3. Retain instructions
The safety and operating instructions should be
retained for future reference.
4. Warnings
All warnings on the unit and in the operating
instructions should be adhered to.
5. Power supply
Power supply should be operated only from the
power source indicated on the marking label. If
you are not sure of the type of power supply to
your home, consult your product dealer or local
power company.
6. General care of unit
Do not open or modify the unit as fire or electric
shock may result. Do not place flower vases,
potted plants, cups, cosmetics, drugs, containers
holding liquids, or small metal objects on or near
the unit. Do not place any objects on the unit and
do not insert or drop metal,combustible objects or
liquids into the unit as such actions can cause fire
or electric shock. If liquid or foreign objects enter
the unit,disconnect immediately since continued
use may result in fire or electric shock. Do not
place the unit on tuners, audio decks or other
electric equipment. Do not use the unit as a step
or seat. The unit may tip over and cause damage
or injury. Consult a company customer service
facility for interior inspection, adjustment or repair.
7. Where not to use unit.
Do not use the unit in bathrooms, areas exposed
to rain or snow, on the shore, near water or in
humid conditions. Do not place the unit in unstable
locations, in kitchens, near humidifiers, or in any
location with likely exposure to smoke or steam.
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8. Unit heat
9. Moving the unit
10. Power cord
11. Unit plug
Do not place the unit in direct sunlight, near
heating equipment or close to open flames. Fire
accident or malfunction may result. Do not place
the unit in locations exposed to cold air or direct
draft. Condensation, leakage current or thermal
damage may result. Do not use the unit in dusty or
dirty locations. Decreased heat ventilation can
cause thermal damage or fire.
The bottom and sides of the unit can heat up
during use and should not be touched. Burns may
result. Only connect or disconnect speaker cables
after the power supply has cooled down.
When moving the unit, shut off power to all
connected equipment, and disconnect power
cords, connection cables, speaker cables and
other wires. Moving the unit while cables are
connected can cause damage to cables, fire or
electric shock. The unit is heavy and care should
be taken when unpacking, moving or lifting.
Manufacturing also creates sharp areas on the
unit; use thorough care in handling.
＊Because the volume knob can be separated
from the amplifier, never hold the volume knob
when moving the amplifier.
Only use the power cord supplied and do not
bend, twist,modify it for repair, or pin it under the
unit. Heavy objects, heat or tension may also
damage the power cord and cause fire or electric
shock. When disconnecting the power cord from
an outlet, do not pull the cord. Pulling on the cord
can damage it and cause fire or electric shock. Do
not touch the power cord with wet hands. Do not
place the power cord near heating equipment and
do not use the unit. If the plug fits loosely in an
electric outlet or the plug or cord is hot. If the cord
is damaged, replace it as continued use may
result in fire or electric shock.
Insert the plug into an outlet all the way to its
base. Incomplete insertion can cause heat
production, and dust build-up can cause fire.
Contact with the prongs of the plug can also
cause electric shock.
Do not connect the unit to an outlet where the
connection is loose even when the plug is inserted
all the way to its base. Do not use the unit if the
plug is hot. Heat production can cause fire.
If dust or metal accumulates on or near the prongs
of the plug, wipe the plug with a dry cloth after
disconnection. Continued use may cause fire or
electric shock.
12. Danger signs
If you notice a strange noise, smoke, unusual
odour or other abnormal condition, shut off the
unit, disconnect the power cord from the outlet
and have the unit inspected. Continued use may
result in fire or electric shock.
13. Electric storms
During electrical storms disconnect the unit and
avoid contact with the antenna and power cord.
Lightning can cause fire, electric shock, and
malfunction.
14. Internal temperature rise
To avoid internal temperature rise when installing
the unit, leave space between the unit and walls
or other equipment. When installed in a rack or
similar fixture, leave a 10cm (4") or larger gap on
top and at sides since internal temperature rise
can result in fire. The unit is provided with
ventilation holes to prevent internal temperature
rise. Blockage of these holes decreases
ventilation and can result in fire. Note the
following.
＊Do not place the unit in a poorly ventilated area
＊Do not place the unit on carpeting or on bedding
＊Do not obstruct the ventilation holes
＊Do not tilt the unit or turn upside down
15. Extended non-use
If the unit is likely to be unused for an extended
period, shut off power and disconnect from power
supply.
16. Volume Adjustment
If abnormal noise is produced during play at high
volume, reduce the volume level. Distorted sound
can cause overheating of speakers and amplifier.
Before switching power supply on, set the
amplifier volume to minimum. Sudden, loud noise
can cause damage to hearing.
17. Connecting TV/other audio equipment
When connecting a TV or other audio equipment,
always shut off power, read the operating manual
for each device and follow the instructions for
connection. Use only designated cables.
Use of non-designated cables or extension cables
can cause heat production, burns, and fire.
18. Antenna
An outdoor antenna should be located away from
power lines.
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19. Maintenance.
Before undertaking maintenance disconnect from
power supply. Have the interior of the unit cleaned
approximately once a year by qualified personnel.
Accumulated dust inside and long intervals
without cleaning can cause fire or malfunction.
Before cleaning this product make sure that the
power is turned off and the power cord is
disconnected from the wall outlet. Clean with a
soft cloth. If the product is particularly dirty,
moisten the cloth and wring out before use.
Complete by wiping with a soft, dry cloth. Do not
use liquid solvents such as alcohol or thinner to
clean this product, as such chemicals can damage
the cabinets.
20. Servicing
The unit should be serviced by qualified personnel
when:
＊The power-supply cord or plug has been
damaged, or
＊Objects or liquid have entered the unit, or
＊The unit has been exposed to rain; or
＊The unit is malfunctioning, or
＊The unit has been dropped or the cabinet has
been damaged.
21. Children
Use particular care in households where children
are present.
22. Temporary Fault
If this product receives a strong external shock
(such as from an impact, static electricity or a
power surge due to lightning), or if this product is
used incorrectly, it may stop working properly.
In such cases, press the power button to turn the
power off and then back on again, and check if
this product is working normally.
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ENGLISH
Notes on Use
■Volume Setting
Before switching ON minimise the volume.
Sudden, large output can damage the
speakers.
■Volume Etiquette
To avoid disturbance in your neighbourhood,
enjoy your unit at an appropriate volume.
Remember that at night, even low volume
carries into surrounding areas.
Help to maintain a pleasant living
environment.
■Speaker Cord Connection
Always connect speaker systems with
power OFF.
If a speaker cable is inadvertently shorted,
the protection circuit in the amplifier will
operate, and audio output will stop
temporarily.
In this event, disconnect the power cord
from the outlet, correct the shorted area
and reconnect the power cord to the outlet.
■Power supply
This product is equipped with vibration
countermeasures and a tone-quality
adjustment and has been designed to
provide a sense of integration when the
amplifier is placed on top of the power
supply.
The setup location has to be well ventilated
and dry.
■Volume knob
Attach the volume knob to the amplifier as
shown in the following figure.
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⑨
R
+
L
+
R-L
-
⑥
④
③
②
①
⑤
⑦
⑧
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Part Names and Functions/Connections
①Volume knob
Tu rn to the right…Increases volume
Tur n t o the left …
②Amplifier
③Power supply
④Power indicator
Power button "ON" ：indicator lights
Power button "OFF"
⑤Power button
Tu r ns the power supply ON/OFF
⑥Line input terminal（R）
Connect to audio source using cable with
RCA pin jack.
Decreases volume
⑦Line input terminal（L）
Connect to audio source using cable with
RCA pin jack.
⑧Power cord
Connect the plug of the power cord to a
power supply socket.
※The shape of the power plug may be
different according to the country of
destination.
⑨Speaker output terminals
When connecting the speakers, insert the
ends of the speaker cables so that they do
not touch the speaker body or
neighbouring terminals.
Speaker cable
●
CAUTION
In order to protect internal parts, the volume knob
will separate from the amplifier if excessive force
is applied to the knob.
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ENGLISH
■Specifications
Specifications
Specifications and appearance are subject to change without prior notification.
[Amplifier]
Rated output: 30 W
(at 6 Ω load, T.H.D : 0.1%)
Max. output: 38 W
(at 6 Ω load, T.H.D : 10%)
Total high harmonic distortion
Frequency characteristics
Input sensitivity: 270mVrms (at 30 W output)
Signal-to-noise ratio: 70dB
Separation rate: 70dB
Input impedance: 10k Ω
Applicable load impedance
Dimensions: 184mm(W)x167mm(D)x197mm(H)
Weight: Approx. 2.5kg [5
[Power supply]
Input voltage: 230V±10％ (50Hz)
Output voltage: +24V DC, -24V DC
Output current: +2A DC, -2A DC
Dimensions: 215mm(W)x183mm(D)x97mm(H)
Weight: Approx. 3.2kg [7
: 0.08%(at 15 W output, 1kHz)
: 10Hz 〜 100kHz (±3dB)
:6〜8 Ω
1
/4"(W)x69/16"(D)x73/4"(H)]
[7
1
/2 lbs]
15
/32"(W)x73/16"(D)x313/16"(H)]
[8
1
/16 lbs]
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