Citronic H Series Power Amplifiers User Manual

: June 14, 2024
: citronic

Table of Contents

Introduction
Warning
Placement
Cleaning
Front Panel
Operation
Specifications
Troubleshooting
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Citronic H Series Power Amplifiers

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 H-series power amplifier as part of your sound reinforcement system. These amplifiers use hybrid class-H architecture to offer high power output in a compact, lightweight form factor. Please read this manual fully and follow the instructions to achieve the best results from your amplifier 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 shorted connections or damaged plugs.
Check that the 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 airflow 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

Cooling vent – do not cover or obstruct
Channel 1 level
Channel 1 indicator LEDs
LCD status display
Channel 2 indicator LEDs
Channel 2 level
Power on/off switch

Rear Panel
Input sensitivity switch 1.0V/1.4V/2.0V
Crossover 120Hz LPF on/off switch
LF processing switch ON-OFF
Mains fuse holder
. IEC mains power inlet
Cooling vents – do not cover or obstruct
Mode switch – Parallel/Stereo/Bridge
Channel 2 line output (XLR)
Channel 1 line output (XLR)
Channel 2 line input (XLR/jack)
Channel 1 line input (XLR/jack)
Channel 2 speaker output (SPK)
Channel 1 (& Bridge) speaker output (SPK)

Operation

Connect speaker cabinets to channel outputs (19, 20) using good quality Speakon® leads and ensure that the combined load on each channel is no lower than 2Ω.

For speaker loads connected in parallel…

For speaker loads connected in parallel… 1/speaker impedance + 1/speaker impedance… = 1/TOTAL impedance.

Therefore…

8Ω + 8Ω = 4Ω total
4Ω + 4Ω = 2Ω total
8Ω + 8Ω + 8Ω + 8Ω = 2Ω total

The rear panel has a MODE switch (14), which determines the way that the amplifier operates. The standard operating mode is STEREO, with each input feeding its relevant speaker output.

PARALLEL mode sums both inputs together in mono so that each amplifier channel receives a mix of both inputs.
Also, both channels can be combined to drive a single load at higher power by selecting BRIDGE mode. In this mode, the input is on channel 1 and the output is from the OUT 1 speaker connecter as indicated on the rear panel (wired to pins 1+ and 2-) WARNING – The minimum load for BRIDGE mode is 4Ω.
Above the MODE switch is a SENSITIVITY switch (8), which has 3 settings for different input levels. The standard setting is 1.0V and further settings for 1.4V and 2.0V higher level inputs will reduce the input sensitivity.
If using the H-series amplifier with a subwoofer cabinet, switching the CROSSOVER switch (9) to 120Hz will filter out higher frequencies to enable the amplifier to focus all of its energy on the sub-frequencies. The normal setting is OFF.
When set to ON, the LF PROCESSING switch (10) provides a 2dB boost around 100Hz for enhanced bass response.
Connect each signal input from mixer or other line level source via XLR or 6.3mm jack connectors to the combo connectors (17, 18) on the rear panel using good quality signal leads. Depending on the output level of the mixer, select the appropriate sensitivity on the rear panel. Wiring connections for balanced or unbalanced inputs are as follows…

Connector type| Signal hot +| Signal cold –| Ground (GND)| Unbalanced wiring
---|---|---|---|---
6.3mm jack| Tip| Ring| Sleeve| Ring + Sleeve combined
XLR| Pin 2| Pin 3| Pin 1| Pin 3 + Pin 1 combined

Each channel input also has a corresponding XLR line output (15, 16) for linking onto further equipment, as necessary.

XLR inputs and outputs for each channel are wired in parallel, allowing signal to be carried forward to further amplifiers. Connect the amplifier to a mains supply (9), ensuring the IEC lead is earthed, in good condition and connected securely. With Channel 1 + 2 controls (2, 6) turned fully down, switch on the power to the amplifier (7). 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.

The LED indicators for each channel (3, 5) are as shown opposite.
In normal operation, the POW indicators will be on and the SIG indicators will light when an input signal is present.

PROT	Protect mode
CLIP	Signal clipping (overload)
SIG	Signal present
POW	Power on

If the input signal is overloading the amplifier, this “clips” above the available power limit. When this happens, the CLIP indicators will light.
It is acceptable for CLIP indicators to flash very briefly in response to loud peaks in the audio signal.
However, if they light for any longer than a brief instant or very frequently, the input level should be reduced or channel level controls on the front panel should be turned down until the regular clipping is eliminated.
If the internal protection circuitry detects a fault in the speakers or amp, the channel(s) will enter protect mode and PROT will illuminate on the front panel to show this. Switch the amplifier off and check the entire system (including speaker leads) before powering up again. If still in Protect Mode, seek advice from qualified service personnel.

Each H-series amplifier also has a backlit LCD display (4) on the front panel with the following information for monitoring.

Mains supply voltage
Internal temperature of each amplifier channel
VU signal meters for each channel
Fan speed

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

Specifications

Model	H1600	H2400
Power supply	200-240Vac, 50Hz (IEC)
Fuse	T8AL 250V	T10AL 250V
Output: RMS @ 2Ω	2 x 800W*	2 x 1200W*
Output: RMS @ 4Ω	2 x 650W	2 x 900W
Output: RMS @ 8Ω	2 x 450W	2 x 600W
Bridge power: RMS @ 4Ω	1700W*	2300W*
Bridge power: RMS @ 8Ω	1250W	1750W
Amplifier: construction	Hybrid Class-H
Protection	Short/open circuit, thermal, RF, DC fault, on/off mute, active

Testing @ 2Ω under 40ms burst, 1kHz sine wave (1.0% THD)

Troubleshooting

No power light on either channel| Ensure IEC inlet is connected to mains and lead is in good condition
---|---
Ensure mains outlet is switched on
Power lights 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 2Ω per channel (4Ω 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
Switch the SENSITIVITY to a lover voltage
Increase input level from audio source
Turn up channel gain controls

Disposal: The “Crossed Wheelie Bin” symbol on the product means that the product is classed as Electrical or Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life. The goods must be disposed of according to your local council guidelines.

Errors and omissions excepted. Copyright© 2022.
AVSL Group Ltd. Unit 2-4 Bridgewater Park, Taylor Rd. Manchester. M41 7JQ
AVSL (EUROPE) Ltd, Unit 3D North Point House, North Point Business Park, New Mallow Road, Cork, Ireland