PPX300 - Receiver Citronic - Free user manual and instructions

Product Type	Power Amplifier
Brand	Citronic
Model	PPX300
Power Supply	240Vac, 50Hz (IEC inlet)
Power Output (RMS @ 8 Ohms)	100W + 100W
Power Output (RMS @ 4 Ohms)	150W + 150W
Bridge Mode Power (RMS @ 8 Ohms)	300W
Input Impedance	20k ohms
Frequency Response	5Hz - 50kHz
Total Harmonic Distortion	0.05%
Slew Rate	40V/µs
Damping Factor	>400
Protection Features	Short-circuit, overload, DC, thermal protect
Controls	CH1/CH2 level, Ground Lift, Mode (Stereo/Bridge), Limiter switch
Input Connectors	XLR and 6.3mm jack (parallel per channel)
Output Connectors	Binding posts and SPK connectors
Dimensions (WxHxD)	483 x 88 x 266mm (2U rackmount)
Weight	8.2kg
Cooling	Front ventilation grille and rear fan
Cleaning	Soft cloth with neutral detergent; vacuum vents
Safety	Avoid moisture, do not open case, use qualified service

Frequently Asked Questions - PPX300 Citronic

What is the minimum speaker impedance per channel for the PPX300?

The minimum load per channel is 4 ohms. For bridge mode, the minimum is 8 ohms.

How do I set up bridge mode?

Switch the MODE switch to BRIDGE. Connect the input to Channel 1. Use the CH1 SPK connector (pins 1+ and 2-) or the red '+' binding posts as indicated. Ensure the load is at least 8 ohms.

What does the LIMITER switch do?

The LIMITER switch activates a protection circuit that prevents the amplifier from overloading. It is recommended in high-power situations to avoid distortion or damage.

Why is the PROTECT LED lit and no output?

The amplifier has entered Protect Mode. Check speaker connections and ensure they are not shorted. Verify the amplifier is not overheated. If the issue persists, seek qualified service.

Can I use the PPX300 in a rack?

Yes, the PPX300 has a 2U rackmount form factor (88 x 483 x 266mm). Ensure adequate support at the base and firm front fixings. Allow sufficient airflow around the unit.

What is the frequency response of the PPX300?

The frequency response is 5Hz to 50kHz, ensuring full-range audio reproduction.

How do I clean the amplifier?

Use a soft cloth with a neutral detergent for the casing. Use a vacuum cleaner to clear the ventilation grilles. Do not use strong solvents.

What should I do if there is excessive mains hum?

Try switching the GROUND LIFT switch to the LIFT position. This can help eliminate ground loop hum. Otherwise, keep it in GND position.

How much power does the PPX300 deliver in 4-ohm stereo?

At 4 ohms, it delivers 150W per channel (150W + 150W).

What type of input connectors does the PPX300 have?

Each channel has XLR and 6.3mm jack inputs wired in parallel. They can also be used as signal outputs for daisy-chaining.

USER MANUAL PPX300 Citronic

Caution: Please read this manual carefully before operating Damage caused by misuse is not covered by the warranty

Introduction

Thank you for choosing a Citronic PPX series power amplifier as part of your sound reinforcement system. This high output amplifier is designed to offer high quality, dependable service for mobile and installed systems. Please read this manual fully and follow the instructions to achieve the best results with your new purchase and to avoid damage through misuse.

Warning

To prevent the risk of fire or electric shock, do not expose any of the components to rain or moisture. If liquids are spilled on the casing, stop using immediately, allow unit to dry out and have checked by qualified personnel before further use. Avoid impact, extreme pressure or heavy vibration to the case No user serviceable parts inside – Do not open the case – refer all servicing to qualified service personnel.

Safety

• Check for correct mains voltage and condition of IEC lead before connecting to power outlet
  • Ensure speaker leads are good condition with no short connections or damaged plugs
• Check impedance of speaker loads do not exceed the minimum stated load for the amplifier
  • Do not allow any foreign objects to enter the case or through the ventilation grilles

Placement

• Keep out of direct sunlight and away from heat sources
• Keep away from damp or dusty environments
• When rack-mounting, ensure adequate support for the base of the amplifier and firm fixings for the front
  • Ensure adequate air-flow and do not cover cooling vents at the front and rear of the amplifier
• Ensure adequate access to controls and connections

Cleaning

• Use a soft cloth with a neutral detergent to clean the casing as required
• Use a vacuum cleaner to clear ventilation grilles of any dust or debris build-ups
• Do not use strong solvents for cleaning the unit

Front Panel

1. Power switch and LED
2. CH1 level control
3. Protect LED indicators
4. Signal LED indicators
5. Clip LED indicators
6. CH2 level control
7. Cooling vent

Rear Panel

1. Cooling fan vent
2. CH1 & CH2 XLR inputs
3. CH1 & CH2 jack inputs
4. GROUND LIFT switch
5. MODE switch
6. LIMITER switch
7. CH1 & CH2 binding post speaker outputs
8. CH1 & CH2 SPK connector outputs
9. IEC mains inlet and fuse

Operation

Connect speaker cabinets to channel outputs using good quality leads via the SPK connector or binding posts and ensure that the combined load on each channel is no lower than 4 . (for speaker loads connected in parallel, 8 + 8 = 4 )

Both channels can be used to drive a single load at the combined volume of each by switching to BRIDGE mode. In this mode, the input is on channel 1 and output from CH1 SPK connector (pins 1+ and 2-) or across the red "+" terminals as indicated on the rear panel - WARNING - Minimum load for bridge mode is 8Ω

Connect each signal input from mixer or other line level source via the XLR or jack connectors on the rear panel using good quality signal leads.

For protection in high power situations, the onboard LIMITER may be switched in to protect from overload. In situations with excessive mains hum coming through the speakers, it may help to switch the GROUND to the LIFT position. This is may help in some situations but otherwise, it is preferred to be switched to GND.

Jack and XLR inputs for each channel are wired in parallel, allowing the signal to be carried forward to further amplifiers if necessary (if the input is XLR, the jack may be used as a signal output and vice versa)

Connect the amplifier to a mains outlet, ensuring that the IEC lead is earthed, in good condition and connected securely. With channel gain controls turned fully down, switch on the power to the amplifier. This unit has a "soft-start" function which makes some checks before engaging power to the amplifiers, which may take a few seconds.

With mixer (or other signal source) levels turned down, gradually increase the amplifier's channel level controls to the required level (normally full) and then gradually increase the signal level from the mixer or sound source until sound can be heard through the speakers and then continue increasing up to the required level.

During use, green "SIGNAL" LEDs will illuminate to show when a signal is present and yellow "CLIP" LEDs illuminate if the output is reaching clip level. If the red CLIP LEDs illuminate more than very briefly, reduce the volume until they hardly light up at all.

If the internal protection circuitry detects a fault in the speakers or amp, the channel(s) will enter Protect Mode and red "PROTECT" LEDs will illuminate on the front panel to show this. Switch the amplifier off and check the entire system (including leads) before powering up again. If still in Protect Mode, seek advice from qualified service personnel.

Before powering down, turn the channel gain controls fully down to avoid loud noises when switching off.

Specifications

Model	PPX300	PPX600	PPX900
Power supply	240Vac, 50Hz (IEC)
Controls	Level channel 1, level channel 2, ground, mode, clip limiter
Input impedance	20k ohms
Frequency response	5Hz - 50kHz
Total harmonic distortion	0.05%
Slew rate	40V/us
Damping factor	>400
Protection	Short-circuit, overload, D.C. and thermal protect
Power RMS @ 4 Ohms	150W + 150W	300W + 300W	450W + 450W
Power RMS @ 8 Ohms	100W + 100W	200W + 200W	300W + 300W
Power RMS bridge @ 8 ohms	300W	600W	900W
Dimensions	88 x 483 x 266mm (2U)	88 x 483 x 266mm (2U)	88 x 483 x 428mm (2U)
Weight	8.2kg	8.8kg	13.8kg

Troubleshooting

No power light on front panel switch	Ensure IEC inlet is connected to mains and lead is in good condition
	Ensure mains outlet is switched on
Power light is on but no other LEDs and no output	Check input signal and connection leads
	Ensure channel gain controls are not turned fully down
Power light and Signal LEDs are lit but no output	Check speaker cabinets are in good working order
	Check speaker leads are in good condition and connected properly
PROTECT LED is lit and there is no output	Switch off and disconnect from mains
	Check speakers are in good working order and not shorted out (using a multi-tester)
	After checking all connected items, power up again
	If still in Protect Mode, switch off again and refer to qualified service personnel
	Ensure cooling vents are clear and amplifier is not overheated
Output is very distorted and “CLIP” LEDs are lighting	Check the speaker impedance is not below 4 Ohms per channel (8 Ohms if bridged)
	Turn down the input level from audio source
	Turn down channel gain controls
Output is working but at very low level	Ensure input source is at line level
	Increase input level from audio source
	Turn up channel gain controls