CTWO 450 - Sound Equipment JBSYSTEMS LIGHT - Free user manual and instructions

Product Type	Professional Stereo Amplifier
Brand	JBSYSTEMS LIGHT
Model	CTWO 450
Dimensions (W x D x H)	483 x 430 x 132 mm
Power Supply	230 V ~ 50 Hz
Stereo Output Power 8 Ω	300 W + 300 W RMS
Stereo Output Power 4 Ω	450 W + 450 W RMS
Bridge Output Power 8 Ω	800 W RMS
Parallel Output Power 8 Ω	800 W RMS
Frequency Response	10 Hz - 50 kHz (-1.5 dB)
Input Sensitivity	0.77 V / 26 dB / 1.4 V (selectable)
Input Impedance	20 kΩ (balanced active)
Signal-to-Noise Ratio	> 90 dB (A-weighted, RMS)
Crosstalk	> 70 dB at 1 kHz, 8 Ω
Damping Factor	> 150 at 1 kHz, 8 Ω
Slew Rate	30 V/μs
Audio Inputs	Balanced XLR and 6.35 mm jack (balanced/unbalanced)
Speaker Outputs	Speakon and binding posts
Operating Modes	Stereo, Bridge (mono), Parallel
Built-in Protections	Short circuit, current limiting, DC fault, mains fuse, thermal cutoff, on/off transients, soft start
Cooling	Variable speed fan with regulation
LED Indicators	Power (green), Bridge (green), Parallel (green), Protection (yellow), Clip (red)
Cleaning and Maintenance	Clean regularly with a vacuum cleaner; do not use water; clean the dust filters behind the front panel

Frequently Asked Questions - CTWO 450 JBSYSTEMS LIGHT

How to connect the amplifier in stereo mode?

Connect the left and right inputs via XLR or jack, then the speakers to the corresponding Speakon or binding post outputs. Set the mode selector to Stereo.

How to configure Bridge (mono) mode?

Turn off the amplifier. Connect the input signal only to the left channel (input 1). Connect the speaker between the red binding posts of both channels: channel 1 (signal +) and channel 2 (signal -). Set the mode selector to Bridge and turn on. Minimum impedance: 8 Ω.

What to do if the protection LED (yellow) lights up?

The yellow LED indicates excessive temperature or a fault. Reduce the volume, check ventilation and connections. If the problem persists, turn off the amplifier and inspect the setup.

How to clean the amplifier?

Use a vacuum cleaner to clean the dust filters located behind the front panel. Never use water or liquid solvents. Perform this operation regularly.

Which input sensitivity to choose?

The selector offers three positions: 0.77 V (gain 26 dB) or 1.4 V. Choose 0.77 V for weak signals and 1.4 V for JB Systems mixers or more powerful preamps.

Can I use unbalanced jack cables?

Yes, for an unbalanced connection, use a mono jack (Tip = signal, Sleeve = ground). For a balanced connection, use a stereo jack (Tip = signal +, Ring = signal -, Sleeve = ground).

What does a continuous clip LED (red) mean?

A continuous red LED indicates a short circuit. Turn off the amplifier immediately and check the speaker connections.

How to connect in parallel mode?

Turn off the amplifier. Connect the input only to the left channel, then connect the speakers normally (as in stereo). Set the mode selector to Parallel and turn on.

What is the minimum impedance in stereo mode?

The recommended minimum impedance per channel in stereo mode is 4 Ω. Below that, the amplifier may overheat or go into protection.

How to avoid ground loops?

Use the ground lift switch in the Lift position to cut the ground connection between the amplifier and other devices. This can eliminate unwanted hum.

USER MANUAL CTWO 450 JBSYSTEMS LIGHT

The PS series amplifiers are high quality and performance amplifiers. To get the maximum result, it features a servo system, power supply and a fan with adjusted speed.

The main features include:

• XLR and 1 / 4' jack balanced input
• Input sensitivity switch
  Output: Speacon and speaker terminals
• Stereo, bridge and parallel switch
  Soft start
  Perfect protection system for the speakers
• Thermal cut off (85°C protection)
  Current limiter

2. Precautions

• Use an adequate power source.
• Do not turn on several amplifiers at the same time.
• Do not allow that the ventilation holes in the front or in the back of the amplifier are blocked in any way.
• Input level controls are present on each channel.
  Output can use speacon or binding posts.
• Please check carefully if the mode switch is in the correct position: stereo, bridge or parallel.
• Clean the amplifier regularly. Especially the dustfilters located behind the front panel should be cleaned regularly.
• Use a vacuumcleaner to remove dust inside the amplifier. Never use water.
• In case of a defect, contact your dealer.

3. Major Operation Controls

A. Front Panel

1. Power ON/OFF

With this switch, you turn the amplifier on. You will note a brief delay in the switching on, due to the soft start.

2/3. Input Level Control

With these rotary VR's, you can adjust the input level of each side. In bridge or parallel mode, only the left VR is active.

4. Power ON Indicator (green)

Indicates that the amplifier is on.

5. Bridge Mode Indicator (green)

Indicates that the amplifier is working in bridge mode. In this case only the left channel needs an input signal.

6. Parallel Mode Inindicator (green)

Indicates that the amplifier is running in parallel mode. The input signal must only be applied to the left channel.

7/8. Protection LED (yellow)

The led light up when the amplifier is overheated (thermal protection) or when something is wrong with the amplifier.

9/10. Peak Level (clip) Indicator (red)

These led will light up in two situations:

a. When the output signal has reached its maximum level, the LED will light. This goes with a distortion of the audio signal. When this occurs, reduce the input level.
b. When you have an input signal and the clip led lights continuously, it means that you have a short circuit on the output. Please turn of the amplifier and check out the problem on the load.

B. Rear Panel

1/5. 1/4' Jack Input Connectors

You can use a balanced or unbalanced input signal.

• Unbalanced: use a mono jack. Tip=signal, Sleeve=ground.
• Balanced: use a stereo jack. Tip=signal+, Ring=signal-, Sleeve=ground.

2/4. XLR Input Connectors

You can use a balanced or unbalanced input signal.

• Unbalanced: Pin 1=ground, Pin 2=signal, Pin 3=ground=pin 1.
• Balanced: Pin 1=ground, Pin 2=signal+, Pin 3=signal-.

3. Input Sensitivity Switch

The position of this switch is very important and depends on the output level of your preamplifier. There are 3 positions:

Full power output at 0,77V input level
26 dB gain of the input signal
Full power output at 1,4V input level. Use this position with JBSystems mixers.

6. Mode Selector

You can select between stereo mode, bridge mode or parallel mode.

• When you use stereo mode, you have to connect the input and output of both channels.
• When you use bridge mode, the input signal must be applied to the left channel only.
• When you use parallel mode, the input signal must be applied to the left channel only.

7. Ground Lift Switch

Setting this switch to the position "left" breaks the ground loop between the amplifier and the chassis ground of various components.

8/11. Speacon Output

When you work in stereo mode, you can use the speacon for connecting your speakers.

The connections are:

1+ and 2+: signal

1- and 2- : ground

9/10. Binding Posts

In stereo mode:

Red = signal

Black = ground

12. Power Cord Socket and Fuse

When the fuse is broken, replace by the same type and value.

4. Operation in bridge mode and parallel mode

A. Bridge Mode

• Turn the amplifier off
• Connect the input to CH1 (left) only
• Connect your speaker system across the red terminals

Red terminal CH1: signal +
Red terminal CH2: signal - (ground)

• The minimum impedance of your speaker system should be 8 Ohm

• Set the mode switch on BRIDGE

• Turn the amplifier on

B. Parallel Mode

• Turn the amplifier off
• Connect the input to CH1 (left) only
• Connect your speakers in the normal way, as you should do in stereo mode
• Set the mode switch on PARALLEL
• Turn on the amplifier

5. Technical Data

MODEL		C2-450	C2-650	C2-800
Output Power	Stereo 8 Ohm Stereo 4 Ohm Bridge 8 Ohm Parallel 8 Ohm Parallel 4 Ohm	300W + 300W 450W + 450W 800W	400W + 400W 650W + 650W 1000W	450 W + 450W 780W + 780W 1300W
Frequency Response		10Hz-50KHz -1,5dB	10Hz-50KHz -1,5dB	10Hz-50KHz -1,5dB
Input Sensitivity		0,77V/26dB/1,4V	0,77V/26dB/1,4V	0,77V/26dB/1,4V
Maximum Input Level		2 Volt	2 Volt	2 Volt
Input Impedance Active Balanced		20k Ohms	20K Ohms	20K Ohms
S/N Ratio A-Weighted RMS		>90dB	>95dB	>100dB
Crosstalk at rated output power 8 Ohm 1KHz		>70dB	>70dB	>70dB
Damping factor at 1KHz 8 Ohm		>150	>200	>200
Slew Rate Internal		30V/μs	35V/μs	40V/μs
Protection		Short circuit, current limited, DC fault, AC line fuse, thermal cut off, power up/down transients, slow start	Short circuit, current limited, DC fault, AC line fuse, limiter, thermal cut off, power up/down transients, slow start	Short circuit, current limited, DC fault, AC line fuse, limiter, thermal cut off, power up/down transients, slow start
Cooling		Variable Speed Fan
Power Supply		230V-50Hz
Dimensions (mm)		483 x 430 x 132

FRANÇAIS

$$ P i n 3 = m a s a $$

Balanceado : Pin1 = masa

$$ \mathrm {P i n} 2 = \mathrm {s e n a l} + $$

$$ P i n 3 = s e \tilde {n} a l - $$

3. Interruptor de sensibilitad de entrada