ITC PRECISION Series User manual

TA-2500/TA-2700/TA-2900/TA-21200
OWNER'S MANUAL
PROFESSIONAL POWER AMPLIFIERS
PROFESSIONAL POWER AMPLIFIER
CHA
MIN MAX
CHB
MIN MAX
POW
PRO
CLP
SIG
PRO
CLP
SIG
TA-2700
PROFESSIONAL POWER AMPLIFIER
CHA
MIN MAX CHB
MIN MAX
POW
PRO
CLP
SIG
PRO
CLP
SIG
TA-21200
PROFESSIONAL POWER AMPLIFIER

NOTES
●Please avoid using this equipment in the following places:
-Exposed to the splashing oil spray, steam, for example, places near the cooker, humidifier, etc.
-Unstable surface, such as rocky desktop or oblique plane.
-Exposed to overheating environment, such as car with window closed or places with direct sunlight.
-Exposed to high moist environment or places with lots of dust.
●Please do not put the power cables near the heater. Otherwise it will lead to melt, cause fire or electric
shock.
●Please seize the plug when pull out the plug from the AC power socket. Please do not pull the cables
directly. Otherwise the power cable will be damaged, to cause fire or electric shock.
●Please do not touch the power plug with wet hands, otherwise it will cause electric shock.
●There are vent holes on the front and rear panel of this equipment, to avoid the internal high temperat-
ure. Please do not obstruct these vent holes. Otherwise it will cause fire. Please note, DO NOT:
-Put this device side or upside down.
-Put this device on poorly ventilated places, such as built-in wardrobe or cupboard bookcase (rather
than installing on the matched holder)
-Cover this device with tablecloth, or put on carpet or in bed.
●Please reserve enough space around this device to keep normal Ventilation. The space should be rese-
rved: 5 cm on two sides, 10m on the backside, 10 cm on the top. If there is no enough space to keep air
flowing, internal temperature of device will rise, and may cause fire.
●If you need to Move the position of this devise, please pull out the power plug from AC power socket,
and pull out all the cables connecting. Otherwise it will damage the cables, and cause fire or electric
shock.
●Please do not put this device on the places where may exposed to corrosive gas or salt fog. Otherwise
it will cause breakdown.

CONTENT
DESCRIPTION
FUNCTION AND FEATURES
FRONT PANEL FUNCTION
REAR PANEL FUNCTION
CONNECTION METHODS
REAR PANEL WIRING DIAGRAM
TECHNICAL PARAMETERS
THE CONNECTION OF THE SPEAKER
1
2
3
5
7
8
9
11
OPERATION
● Please use special speaker cable when connect the speaker to amplifier output. It may cause fire
if use other cables.
● Please power off all other instruments, audio device and speakers. And use the correct cables to
connect accordingly.
● Please adjust the volume control to minimum before turning on the power of this device. Other-
wise sudden outbreak of voice may damage your hearing.
● Please do not use this amplifier for any other purpose except driving the speaker.
● Please pull out the AC power socket in case of fire when the device is in idle for a long
period.

DESCRIPTION
Page 1
Thank you very much for choosing an ITC PRECISION SERIES amplifier. We are sure it will give
you many years of satisfying performance.
ITC power amplifiers of the PRECISION SERIES meet the stringent requirements of tough touring
applications. They are protected against over-temperature, overload, shorted outputs, radio freq-
uency interference and DC faults. The power transistors are protected from damage from reverse
feeding of electrical energy by means of an additional special protective circuit. For the so-called
soft-start, the power outputs are switched on delayed via relays. An inrush current limiter circuit
prevents the mains fuses from being blown.
Maximum precision is also guaranteed as regards mechanical construction and finish. The rob-
ust steel chassis features remarkable torsion resistance and-is specially designed to cope with the
tough wear and tear associated with going on tour. Thermal stability is guaranteed by several low
noise 3-stage fans which also means that they can be used inside the studio. Comparator circuits con-
stantly compare the power amplifiers' input and output signal and control the Iimiters under nonlinear
operating conditions.They protect the loudspeakers from overload due to power stage clipping. The
PRECISION S-ERIES power amplifiers feature excellent transmission properties. The power amp-
lifier topology also makes for extremely low distortion rates. Distortion factor (THD), intermod-
ulation distortion (SMPTEIM) and transient intermodulation distortion (DIM 30 and DIM 100) are
so low that they are only detectable with the most sophisticated measuring equipment.Generously
dimensioned power supplies with low-leakage toroidalcore transformers provide considerable head-
room well above the nominal ratings. V/I foldback limner circuits were deliberately not included in
the PRECISION SERIES power amplifiers to facilitate operation at complex loads up to a phase
angle of +/- 90.
The inputs are electronically balanced on XLR connectors. (Isolation transformers can be retrofi-
tted). Direct Outs in the form of XLR connectors (male), to loop the signal through, are also standard
features. The modes DUAL/Stereo can be selected via the Input Routing Switch. Furthermore, the
PRECISION SERIES power amplifiers can also be operated in "Bridged" mode.
The front panel accommodates the dB-calibrated input Gain controls which are designed as espe-
cially precise and safe-to-operate detented potentiometers. The LED display provides information
about the power amplifers' operating status. For the two channels, they demonstrate readiness to op-
erate, whether there is a signal at the input or output, when the Limiters have been activated and
whether one of the protective features has been triggered. The power outputs Channel A, Channel B
and Bridged Out are available on Speakon connectors. The rear side of the unit accommodates the
ON/OFF switches for the integrated Hi and Lo cut filters, a groundlift switch which separates the
housing from the circuit ground thus helping to prevent hum loops and the operating modes selector
to mono bridged operation. They also feature extremely quiet fans with front-to-rear airflow, facili-
tating operation in large and narrow amplifier racks.
This Owner's Manual is meant to help you familiarize yourself with all the PRECISION SERIES'
other features. Please read it through carefully and we guarantee that your new power amplifier of the
PRECISION SERIES from ITC will give you great pleasure.

FUNCTION AND FEATURES
Function and Features:
1. Industrial modeling steel professional panel, solid and durable, washable panel with dust screen.
2. Soft start to prevent high current power absorbing and interfere with other electrical equipment.
3. Intelligent forced cooling design, with low fan noise, high heat dissipation and other features.
4. Built-in intelligent limiter system to control the power module and the speakers work safely.
5. Built-in 30Hz / 50Hz high-pass filter.
6. Multiple modes: stereo, bridge and parallel.
7. Plentiful reserve power, with 2R low-impedance output, high-fidelity sound which can perfectly
restore audio quality to allow the actors to play incisively and vividly;
8. High-quality low-impedance transformer and large capacity electrolytic filter to ensure working
in large dynamic range;
9. H-class efficient power amplifier, complete and reliable security protection measures and working
status indication (short circuit, overload, DC and overheating protection, transformer overheating
protection) to allow users relieved operating.
Page 2

Front panel(2U):
1.
2.
3.
4.
5.
6.
Level Control
Potentiometer controls amplifier’s input level, clockwise rotation to increase the volume, whereas
the volume decreases.
Power Switch
After the switch is turned on, POWER lamp is lit and you can hear the "Tap" sound of the relay pull
-in in the machine.
Power Indicator
The power is turned on when indicator is lit.
Protect Indicator
When the machine appears overheating protection of amplifier and transformer, the indicator will
show red. If machine is in protection status for a long time after turning on, the machine is faulty,
please contact your dealer.
Clipping Indicator
When the (yellow) indicator is lit by signal, the output signal has been distorted, indicating that the
input signal is too large, please reduce the input signal.
Signal Indicator
When the (green) indicator is lit, the input signal is normal. When the machine fails or the input si-
gnal is not correct, the (green) light is not on.
2
1
3
4
5
6
FRONT PANEL FUNCTION
Page 3

Front panel(3U):
2
1
3
4
5
6
FRONT PANEL FUNCTION
1.
2.
3.
4.
5.
6.
Level Control
Potentiometer controls amplifier’s input level, clockwise rotation to increase the volume, whereas
the volume decreases.
Power Switch
After the switch is turned on, POWER lamp is lit and you can hear the "Tap" sound of the relay pull
-in in the machine.
Power Indicator
The power is turned on when indicator is lit.
Protect Indicator
When the machine appears overheating protection of amplifier and transformer, the indicator will
show red. If machine is in protection status for a long time after turning on, the machine is faulty,
please contact your dealer.
Clipping Indicator
When the (yellow) indicator is lit by signal, the output signal has been distorted, indicating that the
input signal is too large, please reduce the input signal.
Signal Indicator
When the (green) indicator is lit, the input signal is normal. When the machine fails or the input si-
gnal is not correct, the (green) light is not on.
Page 4

Rear panel(2U):
134
5
6
7
8910
1112
2
REAR PANEL FUNCTION
1.
.
3.
4.
5.
6.
7.
The output of the loudspeaker is connected between the red and black binding posts of
each channel, while it will be connected between two red binding posts when bridging.
8.
9.
10
11.
12.
Channel A/B balanced and unbalanced input
(Note: When using BRIDGE or PARALLEL mode, only the jack of channel A is effective).
2Channel A/B balanced LINK output.
Amplifier channel A/B SPEAKER jacks
Neutrik NL4FCSPEAKON is used as an output connection jack.
AC power input
Before connected to main grid, please check if the voltage is consistent with the marked.
GND Terminal
This is a screw-type ground terminal. If you are having a problem with “hum” or noise, please use
this terminal to ground or connect to the chassis of the mixer, preamp, or other device.
Over-current protection device
Channel A/B binding post output jack
Channel A voltage limiting switch
Channel A high-pass filter trigger
.Working modes selector switch
①STEREO mode: Channel A and Channel B are autonomous working. The input signal of channel
A will be output by its output jack. The input signal of channel B will be output by its output jack.
②PARALLEL mode: The input signal of channel A will be output by the output jacks of channel A
and channel B. The output jack of channel B does not work and the volume of channel A and cha-
nnel B can be autonomously adjusted.
③BRIDGE mode: The input signal of channel A will be output via BRIDGE output jack. If the
volume is needed to be adjusted, the volume control knob of channel A has to be used and the
volume control knob of channel B will be out of run.
Channel B voltage limiting switch
Channel B high-pass filter trigger
Page 5

REAR PANEL FUNCTION
Rear panel(3U):
1.
.
3.
4.
5.
6.
7.
The output of the loudspeaker is connected between the red and black binding posts of
each channel, while it will be connected between two red binding posts when bridging.
8.
9.
10
11.
12.
Channel A/B balanced and unbalanced input
(Note: When using BRIDGE or PARALLEL mode, only the jack of channel A is effective).
2Channel A/B balanced LINK output.
Amplifier channel A/B SPEAKER jacks
Neutrik NL4FCSPEAKON is used as an output connection jack.
AC power input
Before connected to main grid, please check if the voltage is consistent with the marked.
GND Terminal
This is a screw-type ground terminal. If you are having a problem with “hum” or noise, please use
this terminal to ground or connect to the chassis of the mixer, preamp, or other device.
Over-current protection device
Channel A/B binding post output jack
Channel A voltage limiting switch
Channel A high-pass filter trigger
.Working modes selector switch
①STEREO mode: Channel A and Channel B are autonomous working. The input signal of channel
A will be output by its output jack. The input signal of channel B will be output by its output jack.
②PARALLEL mode: The input signal of channel A will be output by the output jacks of channel A
and channel B. The output jack of channel B does not work and the volume of channel A and cha-
nnel B can be autonomously adjusted.
③BRIDGE mode: The input signal of channel A will be output via BRIDGE output jack. If the
volume is needed to be adjusted, the volume control knob of channel A has to be used and the
volume control knob of channel B will be out of run.
Channel B voltage limiting switch
Channel B high-pass filter trigger
Page 6
5
6
7
1112 1 34
8910
2

Connection methods:
Amplifier output connector:
SPEAKON speaker connected dedicated connector, bridging CHA SPEAKON available Bridged
output, use binding post
Connection method is as follows:
+1; +2 Output;
-1; -2 is the ground wire.
XLR connector is the connector for balancing transmission signal.
The definition of each input pin is:
PIN 1: Ground
PIN 2: Signal Hot End
PIN 3: Signal Cold End
For unbalanced input method, PIN 1 and PIN 3 are short-circuiting. Input sensitivity is 1V.
,
OUTPUT INPUT
CONNECTION METHODS
Input Link
Pin 1+and
Pin 1-
Pin 2+and
Pin 2-
+1
-1
+1
-1
Speakon Cable,Speakon, 2 conductors
Speakon Pin1 connection
Please notice：
To avoid the fan hole of the machine is blocked which caused the machine over-heat, please tear down
the dust screen from the panel on a regular base to clean it.
Cleaning method: tear down the four screws form the panel and pick out the dust screen. After the dust
screen is cleaned and dried, put it back.
Page 7

THE CONNECTION OF THE SPEAKER
The impedance of the speaker:
Connect the speaker as shown below:
①Under the STEREO and PARALLEL mode to
connect the configuration, when use the binding
post socket:
②Under the BRIDGE mode to connect the
configuration, when use the binding post
socket:
③Under the STEREO and PARALLEL mode to
connect the configuration, when use the
SPEAKON socket:
④Under the BRIDGE mode to connect the
configuration, when use the SPEAKON
socket:
The Minimum Impedance of the speaker: 2Ω
The Minimum Impedance of the speaker: 4Ω
SPK- SPK+
SPK- SPK+
SPK-SPK+
SPK- SPK+
SPK- SPK+
SPK+ TO PIN1+
SPK- TO PIN1-
SPK+ TO PIN1+
SPK- TO PIN1-
SPK- SPK+
SPK+ TO PIN1+
SPK- TO PIN2+
The Minimum Impedance of the speaker: 2Ω
The Minimum Impedance of the speaker: 4Ω
Please notice:
The impedance of the speaker changed alone with the connection way and the sets of the speaker.
Please make sure that the impedance will not lower than the minimum value as shown above.
Page 8

Rear panel wiring diagram(2U):
REAR PANEL WIRING DIAGRAM
+
-
SPEAKER
+
-
AMPLIFIER
REC LINE 10 LINE 9 LINE 8 LINE 7
LEFT
RIGHT
MIC INPUTS MIC/LINE INPUTS
220V/50Hz
MAX 9.9W P.T.T 1 2
3
4
5
6
7
89
10
INSIDE AC/DC
FUSE 220VAC DC POWER
24V MAX 0.6A
AVI S:
RISQUE D E CHOC EL ECTRI CUS
-NE PAS QUV RIR
RISK OF ELE CTRIC S HOCK
DO NOT OPEN
PUB LIC AD DRES S SYS TEM SERIA L NO:
2 1
3
7
4
5
2
4
2
GND
PRIORITY
CHIME
LED PWR
MIC INPUT
1
3
5
6
7
1
3
6
CHIME
REMOT E
MODEL NO: T-2S01
PRE AMPL IFIER
2--OUTPUTS--1
NO.1
AMPLIFIER
REC LINE 10 LINE 9 LINE 8 LINE 7
LEFT
RIGHT
MIC INPUTS MIC/LINE INPUTS
220V/50Hz
MAX 9.9W P.T.T 1 2
3
4
5
6
7
89
10
INSIDE AC/DC
FUSE 220VAC DC POWER
24V MAX 0.6A
AVI S:
RISQUE D E CHOC EL ECTRI CUS
-NE PAS QUV RIR
RISK OF ELE CTRIC S HOCK
DO NOT OPEN
PUB LIC AD DRES S SYS TEM SERIA L NO:
2 1
3
7
4
5
2
4
2
GND
PRIORITY
CHIME
LED PWR
MIC INPUT
1
3
5
6
7
1
3
6
CHIME
REMOT E
MODEL NO: T-2S01
PRE AMPL IFIER
2--OUTPUTS--1
NO.2
SPEAKER
SPEAKERS SPEAKERS
Page 9

Rear panel wiring diagram(3U):
REAR PANEL WIRING DIAGRAM
Page 10
+
-
SPEAKER
+
-
SPEAKER
AMPLIFIER
AMPLIFIER
NO.1
NO.2 SPEAKERS SPEAKERS

Technical parameters:
Frequency Response
20Hz-20KHz( )+0 dB /-3 dB
Input Resistance
20K Ohms
SNR (A-weighted)
≤-100dB
Input Sensitivity
0dBu(1V)
THD+N
≤0.03%
Resolution (@ 1KHz)>75dB
Damping Factor (@ 1KHz)>200
Size(mm) 484×530×132
484×490×88
Weight
18.5Kg 27.5Kg 30.5Kg 34Kg
Output Power
Bridge Connection 4R
TA-2500
500W*2
750W*2
1100W*2
1500W
TA-2700
700W*2
1050W*2
1550W*2
2100W
TA-2900
900W*2
1350W*2
2000W*2
2700W
4000W
TA-21200
1200W*2
1800W*2
2700W*2
3600W
Stereo/Parallel 8R
Stereo/Parallel 4R
Stereo/Parallel 2R
Bridge Connection 8R
2200W 3100W 5400W
TECHNICAL PARAMETERS
Page 11

PROFESSIONAL POWER AMPLIFIERS
PRECISION SERIES
V0.1
■This manual Specifications and descriptions are for reference only.
The Company reserves the right to change products or specifications at any time without notice.