ITC T-2120DS User manual

Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
OPERATION MANUAL
CLASS-D AMPLIFIER
T-2120DS/2240DS/2350DS/2500DS
PUBLIC ADDRESS SYSTEM
POWER
OFF
ON
CH2CH1
PEAK
SIG
PROT
100V
4-16ΩMIN MAXMIN MAX
CLASS-D AMPLIFIER
T-2350DS

1. SAFETY PRECAUTIONS ...............................................................................1
3. FEATURES....................................................................................................3
4. NOMENCLATURE AND FUNCTIONS
4.1 Front Panel ...................................................................................... ...........4
4.2 Rear Panel..................................................................................................5
5. MACHINE OPERATION
5.1 Read before using the amplifier..........................................................................5
5.2 Key operation on the panel................................................................................6
5.3 Remote operation..........................................................................................6
5.4 Select the input channel...................................................................................6
5.5 Function Operation of the Panel..........................................................................7
5.6 Indicator instruction of the panel.........................................................................7
6. CONNECTIONS ...............................................................................................8
. .............................................................................................9
. BLOCK DIAGRAM.......................................................................................10
9. ...........
2. PRODUCT OVERVIEW .................................................................................. 3
7
8
APPLICATIONS
SPECIFICATIONS.................................................................. 11

Be sure to read the instructions in this section carefully before use.
Make sure to observe the instructions in this manual as the conventions of safety symbols and messages
regarded as very important precautions are included.
We also recommend you keep this instruction manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
Do not place cups, bowls, or other containers of
liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a
fire or electric shock.
Do not insert nor drop metallic objects or flammable
materials in the ventilation slots of the unit's cover,
as this may result in fire or electric shock.
When Installing the Unit When Installing the Unit
Should the following irregularity be found during
use, immediately switch off the power, disconnect
the power supply plug from the AC outlet and contact
y our nearest dealer. Make no furtherattempt to
operate the unit in this condition as this may cause
fire or electric shock.
If you detect smoke or a strange smell coming
from the unit.
If water or any metallic object gets into the unit
If the unit falls, or the unit case breaks
If the power supply cord is damaged (exposure
of the core, disconnection, etc.)
If it is malfunctioning (no tone sounds.)
To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing
to your nearest dealer.
ITC
ITC
Do not expose the unit to rain or an environment
where it may be splashed by water or other liquids,
as doing so may result in fire or electric shock.
Use the unit only with the voltage specified on
the unit.Using a voltage higher than that which
is specified may result in fire or electric shock.
Do not cut,kink otherwise damage nor modify the
power supply cord. In addition, avoid using the
power cord in close proximity to heaters, and never
place heavy objects - including the unit itself - on
the power cord, as doing so may result in fire or
electric shock.
Be sure to replace the unit's terminal cover after
connection completion. Because high voltage
is applied to the speaker terminals, never touch
these terminals to avoid electric shock.
Be sure to ground to the safety ground (earth)
terminal to avoid electric shock. Never ground
to a gas pipe as a catastrophic disaster may result.
Avoid installing or mounting the unit in unstable
locations, such as on a rickety table or a slanted
surface. Doing so may result in the unit falling
down,causing personal injury and / or property
damage.
1. SAFETY PRECAUTIONS
1

SAFETY PRECAUTIONS
An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in
the electrical installation of the building.
Never plug in nor remove the power supply plug
with wet hands, as doing so may cause electric
shock.
When unplugging the power supply cord, be sure
to grasp the power supply plug; never pull on the
cord itself. Operating the unit with a damaged
power supply cord may cause a fire or electric
shock.
When moving the unit, be sure to remove its power
supply cord from the wall outlet. Moving the unit
with the power cord connected to the outlet may
cause damage to the power cord, resulting in fire or
electric shock. When removing the power cord, be
sure to hold its plug to pull.
Do not block the ventilation slots in the unit's cover.
Doing so may cause heat to build up inside the unit
and result in fire.
Avoid installing the unit in humid or dusty locations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steam as doing otherwise may result in fire or
electric shock.
Do not place heavy objects on the unit as this may
cause it to fall or break which may result in personal
injury and/or property damage. In addition, the object
itself may fall off and cause injury and/or damage.
Make sure that the volume ontrol is set to minimum
position before power is switched on. Loud noise
produced at high volume when power is switched
on can impair hearing.
Do not operate the unit for an extended period of
time with the sound distorting. This is an indication
of a malfunction, which in turn can cause heat to
generate and result in a fire.
Contact your dealer as to the cleaning. If
dust is allowed to accumulate in the unit over a
long period of time, a fire or damage to the unit
may result.
ITC
If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it peri-
odically. In addition, insert the plug in the wall outlet
securely.
Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. Doing otherwise may cause a fire or electric
shock.
Due to product upgrades, while some of the
features and specification in the user manual
does not match the actual functions, sorry for
any inconvenience and thanks for your kind
understanding!
When Installing the Unit When Installing the Unit
2

2. PRODUCT OVERVIEW
3
DS series Class-D amplifiers rated output power is various from 120W to 500W, with high performance
switching power supply &Class D type power amplifier chip combination. It adopts I U chassis design,
which has high efficiency, light weight and beautiful appearance.
3.FEATURES
1. It adopts high-efficiency class D amplifying circuit and built-in high-efficiency switching power
supply, making the whole machine efficiency up to 85%. It adopts reasonable heat dissipation
layout to keep the working status even in extremely harsh working environment, which greatly
extending the life span of the equipment.
2. With 1U standard design 19-inch industrial chassis, and the output power: 120W, 240W, 350W and
500W. With 2 channel output for speakers, and with 1 channel phoenix terminal for remote monitoring
of the working state of the equipment. With short circuit, overload and overheat protection.
3. Each channel is with 4~16Ω and 100V switch, which can be connected to constant resistance and
100V speakers to reach more flexible application.
4. With acrylic panel design to make it look more distinctive and artistic .

4. N OME NCLATUR E AND F UN CTI ONS
4.1 FRONT PANEL
4
1. Volume potentiometer (CH1~CH4)
The potentiometer controls the input power of the amplifier, and the normal adjustment range -30db
~+40dB. When the potentiometer is rotated clockwise, the volume will be gradually increased. In
reverse, the output level will decrease.
2. POWER SWHIT (power switch)
Switch up, power on, switch down, power off.
3. POWER (power indicator)
When the power is turned on, the power indicator lights up to indicate that the machine is in working
state. When the power is turned off , the power indicator goes off.
4. Signal indicator (SIG)
When there is a music signal input, this signal indicator lights up and the volume potentiometer is
turned on; its brightness changes according to input music signal sensitivity.
5. PROT (protection indicator)
This indicator lights on when the protection function is open. If the speaker wire is short-circuited or
the sum of the connected speaker power is bigger than 1.5 times of the rated power, it will cause the
circuit protection and disconnection of the amplifier output and the protection indicator will be on
(The signal indicator is only used to indicate the input of the music signal. In the protection state, the
signal indicator still lights up according to the input signal sensitivity.) This indicator is off when the
machine is working normally.
6. Signal peak indicator (PEAK)
When the indicator light is on, the machine has reached the peak of rated power output. In order to
avoid serious distortion or peak clipping, the potentiometer should be appropriately adjusted to
reduce the volume.
7. 100V: 100V mode status indicator.
8. 4~16Ω: Constant resistance 4~16Ω mode status indicator.
POWER
OFF
ON
CH2CH1
PEAK
SIG
PROT
100V
4-16ΩMIN MAXMIN MAX
CLASS-D AMPLIFIER
T-2240DS
123
4
5
6
7
8

4. N OME NCLATUR E AND F UN CTI ONS
4.1 FRONT PANEL
5
9. AC power input is connected to the local power system.
Please check whether the operating voltage is consistent with the marked voltage.
10. The cooling port and fan are for heat dissipation.
Please keep the it to be good Ventilation to avoid overheat protection.
11. With 100V /4~16Ω speaker output port
It is used to 100V or 4~16Ω speakers
(The sum of the total power of all speakers is not more than 80% of the rated power of the amplifier).
12. Remote monitor port for the device working status by connecting with external device,
13. Balance signal input interface. Input sensitivity of this product is default setting to be 0dB(0.775v).
14. Switch buttons for 100V and 4~16Ω mode
5. M ACH INE OPE RATIO N
Read Before Using The Amplifier
Volume Control
The volume depends on the performance of the speaker, position and some other factors. Pls avoid
to use the amplifier in the status of high volume for a long time.
Choice Of The Audio Source
In order to play the best performance of this device, please select the balanced signal sources after
processing by the preamplifier. Local input sensitivity is set to be 0dB (0.775V).
Connection Method
Please do not power on until all connections are completed. The audio cable connection need to
be fixed properly, otherwise it will reduce the sound quality, produce noise, or even damage the
device. are paralleled connected with the device. In a supermarket, there is
dozens or hundreds of speakers after an amplifier, these speakers are on a wire. See wiring
diagram of the device for the connection method, the load with , all of the
speakers the power is not greater than the power of the amplifier's rated output power.
100V/4~16Ω speaker
100V/4~16Ω speaker
100V
100V/
G
100V/
G
FAILED FAILED
100V
4-16Ω4-16Ω
4-16Ω4-16Ω
OUT CH1 IN OUT CH2 IN
9
12
14
10
13
11

100V
100V/
G
100V/
G
FAILED FAILED
100V
4-16Ω4-16Ω
4-16Ω 4-16Ω
OUT CH1IN
OUT CH2IN
POWER
OFF
ON
CH2CH1
PEAK
SIG
PROT
100V
4-16ΩMIN MAXMIN MAX
CLASS-D AMPLIFIER
T-2240DS
Figure 1
POWER
OFF
ON
Figure 2
Connect AC power line, as shown below:
After the device enter to working status, input balanced audio source signal in the rear
panel,adjust the volume potentiometer to select the appropriate volume. At this point,
it has completed the basic operation of the device.
Key operation on the panel
Remote operation
Turn the power switch button, after connecting the device to AC power, the front panel power
indicators, protection indicators and remote power indicators and remote protection indicators
lit at the same time, after about 3 seconds the light turns off. The amplifier built-in protection
relay closed, power amplifier and the output connection is regular. After device enters to the
working status, it has completed the device local power on operation. Press the power switch,
after power off, power indicators are off. Device power off operation is completed.
6
MA CHI NE OPER AT ION
Select the input channel
Connecting "INPUT" at CH1, music signal source of balanced input 775mV,0dB at audio
cable, after connecting speaker with output terminal, then turn up volume knob, you could
hear the music.
And the operation of CH1, CH2 input method is the same.
100V/
G
FAILED
100V
4-16Ω
4-16Ω
OUT CH1IN
Figure 3
100V
100V/
G
100V/
G
FAILED FAILED
100V
4-16Ω4 -16Ω
4-16Ω4-16Ω
OUT CH1 IN OUT CH2 IN

7
MA CHI NE OPER AT ION
Function Operation of the Panel
Turning master volume control knob on the panel to adjust the volume. Turning clock-
wise slowly, volume gets higher; anti-clockwise, volume gets lower until zero level.
Indicator instruction of the panel
" POWER" Blue power indicator, If this signal light is on, the power source is connected.
" SIN" Green signal indicator ,When input audio source and turn on master volume
control knob, the indicator is gleaming. Turning up the volume, the indicator becomes
more bright,which means the signal output is greater.
"PEAK" Orange topping indicator ,When input audio source exceeds input standard
voltage,turn up the master volume control to the max level and turn on the voltage limita-
tion function. At 100V output of constant voltage, if the indicator lightens, it means the
amplifier is at clip state. It is proposed that the amplifier should not work in clip state for
a long time or it will be easily damaged.
"PROT" Red protection indicator ,When the amplifier is in the protection state of short-
circuit, overloading, overheating or fault, the indicator will lighten and cut off the output
at same time.
Attention: Under condition of overloading or unventilated environment, the amplifier will
get overheating. If the amplifier operates in such kind of state for a long time, to protect the
amplifier and speaker, it will automatically trigger thermal protection circuit and cut off the
output of amplifier or the power. After the temperature inside lowers to normal one, it will
recover automatically.

Speaker connection:
Loosen the pressure screw.
Put the speaker cable under the wire clamp pad.
Tighten the pressure screw and make sure the
connection is good.
1.
2.
3.
NOTE:
100V output must be connected in parallel with the speakers, and should be connected
with the constant voltage speakers, constant voltage speaker is with built-in transformer,
there marked input voltage in back; if it connects with the constant resistance speakers,
it will be easy to damage the speakers .
When use the device, please do not directly touch the 100V speaker output
interface of the exposed metal parts in the rear panel to avoid electrical shock.
Total impedance
6. C ONN ECTIO NS
8
Speaker connections
Attention:
Connect cable with the speaker, then with the host.
Speaker Selection: Constant Voltage 100V Speaker.
Please use black and red wire for the speaker line, connect black wire to speakers
terminal; the red wire connect with speakers" 100V " marked at back, the other end
connect with the" 100V "terminal in the rear panel.
Avoid to operate the amplifier in full power state for a long time.
Do not connect the two speaker wires by short circuit way, to avoid damage the
equipment.
100V/4-16Ω
100V LINE
20 (T-2500DS)
83 (T-2120DS)
28 (T-2350DS)
42 (T-2240DS)
G
100V
4-16Ω

7. A PPL IC ATIONS
9
1: COLD-
2:
3: GND
HOT+
When connecting, put the red cable to +
terminal at the host, white to "- " terminal,
and the shielded wire to the GND terminal.
The same connection to the output terminal
of the pre-audio source processor.
" "
1 2 3
G
100V
100V/
G
100V/
G
FAILED FAILED
100V
4-16Ω4 -16Ω
4-16Ω4-16Ω
OUT CH1 IN
OUT CH2 IN
Equalizer
Audio source equipment like CD/MP3 player PREAMPLIFIER
SPEAKER SPEAKER
ON
OFF
USE ON LY WITHA 2 50W FUS E
CHANNEL 2 OUTPUT CHANNEL 2 INPUT
CHANNEL 1 OUTPUT CHANNEL 1 INPUT
+-
12
3
PUS H
+ -
+ -
12
3
PUS H
+ -
OPEN
CLOSE
PLAY STOP NEXTPREVIOUS
ON
OFF
POWER
1 1+2 2
OUTPUT OUTPUT OUTPUT
1 1+2 2 1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
OUTPUT
1 1+2 2
SIG SIG SIG SIG SIG SIG SIG SIG SIG SIG
LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL LEVEL
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
0
2
3
456
7
8
10 0
19
2
3
456
7
8
10 0
19
0 0 0
HIGH
LOW
HIGH
+3 0 -3
-8
-13
MODE MODE MODE MODE MODE MODE MODE MODE MODE
P.T.T 1
CHIME
MASTER
1
LOW
MASTER
2
PRIORITY2
PRIORITY3
PRIORITY4
LINE MIC
POWER
MASTER VOLUME
1
2
MASTER VOLUME
MIC/LINE 2 MIC/LINE 3 MIC/LINE 4 MIC/LINE 5 MIC/LINE 6 MIC/LINE 7 MIC/LINE 8 MIC/LINE 9 MIC/LINE 10
ON
LINE MIC
LINE MIC
LINE MIC
LINE MIC
LINE MIC
LINE MIC
LINE MIC
LINE MIC
ON
1 2 3
MIC

8. B LOC K DIAGR AM
10
LIMIT
CONTROL
BAND-PASS
FILTER
CLIP LED
SIG LED
Gas-discharge tube
PROT LED
Volume
LIMIT
CONTROL
BAND-PASS
FILTER
CLIP LED
SIG LED
Gas-discharge tube
PROT LED
Volume
1 2 1 2
Failed Output Failed Output
100V/4-1 6Ω100V/4-1 6Ω
100V LED 4-16ΩLED
100V/4-1 6Ω100V/4-1 6Ω
100V LED 4-16ΩLED
Switching power supply + Digital amplifier module
Switching power supply + Digital amplifier module
Protection circuit
Fan control
Amplifier output
Amplifier output
Protection circuit
Fan control

9. S PEC IFICATIO NS
DIMENSIONS
WEIGHT
484X315X44mm
4.8Kg
4.7Kg
4.6Kg 4.9Kg
MODEL
RATED POWDR OUTPUT
SPDADER OUTPUTS
INPUT SENSITIVITY AND IMPEDANDCE
FREQUENCY RESPONSE
100V/ 4~16Ω
±385mV/20KΩ, balanced input
80Hz~16KHz(+1dB,-3 ) dB
S/N RATIO
THD
CONTROL
INDICATOR LIGHT
≥95dB
≤0.1% at 1KHz,1/3 rated power
Remote power control and fault indication
Signal, peak clipping, protection and power supply
PROTECTION High temperature, overload, short circuit
POWDR CONSUMPTION
POWER SUPPLY
OVERLOAD SOURCE
ELECTROMOTIVE FORCE ＞11dB
T-2120DS T-2240DS T-2350DS
2x350W2x240W2×120W
T-2500DS
2x500W
320W 600W 900W 1200W
~110V 50Hz
~120V 50Hz
~220V 50Hz
~230V 50Hz
~240V 50Hz
~110V 60Hz
~120V 60Hz
~220V 60Hz
~230V 60Hz
~240V 60Hz
11

PUBLIC ADDRESS SYSTEM
VersionV0.1