CEQ231 - DJ Equipment Citronic - Free user manual and instructions

Product Type	31-Band Graphic Equalizer
Channels	2 (Stereo)
Frequency Bands	31 ISO bands per channel
Frequency Range	20 Hz – 20 kHz
Input Connectors	2 x XLR, 2 x 1/4" TRS
Output Connectors	2 x XLR, 2 x 1/4" TRS
Input Impedance	20 kΩ (balanced)
Output Impedance	100 Ω (balanced)
Maximum Input Level	+21 dBu
Maximum Output Level	+21 dBu
Signal-to-Noise Ratio	> 95 dB
Total Harmonic Distortion	< 0.005%
Frequency Response	20 Hz – 20 kHz, ±0.5 dB
Controls	31 sliders per channel, bypass switch, level control
Indicators	LED level meters, power LED
Power Supply	AC 110-240V, 50/60 Hz (internal)
Power Consumption	15 W
Dimensions (W x D x H)	483 x 200 x 88 mm (19" rack, 2U)
Weight	4.2 kg
Cooling	Natural convection (no fan)
Maintenance	Clean with dry cloth; avoid liquids
Safety Compliance	CE, RoHS
Spare Parts / Repairability	Contact Citronic support; sliders and connectors replaceable

Frequently Asked Questions - CEQ231 Citronic

How do I connect the CEQ231 to my mixer?

Use balanced XLR or 1/4" TRS cables. Connect the mixer's outputs to the equalizer's inputs, and the equalizer's outputs to your amplifier or speakers.

What is the bypass switch for?

The bypass switch routes the signal directly from input to output without any equalization, allowing you to compare the processed and unprocessed sound.

How many bands does the CEQ231 have?

It has 31 ISO frequency bands per channel, covering the full audio spectrum from 20 Hz to 20 kHz.

Can I use the CEQ231 in a live sound setup?

Yes, it is designed for both live sound and studio applications. Its rugged 2U rack-mount design is built for professional use.

What is the power requirement?

The unit uses an internal power supply accepting 110-240V AC, 50/60 Hz. It consumes about 15 watts.

How do I clean the equalizer?

Use a soft, dry cloth to wipe the front panel and sliders. Do not use liquids or sprays, as they may damage the electronics.

What should I do if a slider becomes noisy?

Apply a small amount of contact cleaner specifically designed for faders. Move the slider back and forth to distribute the cleaner.

Is the CEQ231 a mono or stereo unit?

It is a stereo equalizer with two independent channels, each with its own set of 31 sliders and controls.

What is the maximum input level?

The maximum input level is +21 dBu, which provides plenty of headroom for professional audio signals.

Does the CEQ231 come with a warranty?

Typically, Citronic offers a 1-year warranty. Check with your dealer or the official Citronic website for specific terms.

USER MANUAL CEQ231 Citronic

• Switchable Bypass per channel
• Switchable Low Cut filter per channel
  • Independent Gain controls
• ±12dB adjustment per band
  • Balanced or unbalanced signal path
  • LED VU display per channel

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 equalizer unit. This product has been designed to deliver professional tone-shaping facilities with reliable and accurate function. In order to achieve the best results from this equipment and avoid damage through misuse, please read and follow these instructions and retain for future reference.

Warning

To prevent the risk of fire or electric shock, do not expose any part of the unit to rain or moisture. If liquids are spilled on the surface, 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 unit.

There are no user serviceable parts inside the equalizer—refer all servicing to qualified service personnel.

Safety

- Check that the supplied mains lead is in good condition and the supply voltage is correct.

- Ensure signal leads are of good condition and connected to appropriate inputs/outputs

- Do not allow any foreign particles to enter the console through slider or connector apertures

Placement

- Keep out of direct sunlight and away from heat sources.

- Keep away from damp or dusty environments.

- When rack-mounting, avoid placing heavy units above the unit and ensure all connectors are accessible

Cleaning

• Use a soft cloth with a neutral detergent to clean the casing as required

- Use a soft brush to clear debris from the control surface

- Do not use strong solvents for cleaning the unit.

Front Panel

1 Independent GAIN controls
2 LOW CUT filter switches and indicators
3 IN/OUT bypass switches and indicators
4 LED VU indicators
5 Frequency sliders
6 Power button

Rear Panel

7 Independent GAIN controls
8 LOW CUT filter switches and indicators
9 IN/OUT bypass switches and indicators
10 LED VU indicators
11 Frequency sliders
12 Power button
3 170.923UK, 170.926UK User Manual

What is Equalization?

Equalization (or EQ) is so called because its primary function is to accurately “equalize” or balance the frequency profile of a signal for a given application or environment. This is especially noticeable in large rooms, which can emphasise “boominess” in the low frequencies or rooms with soft furnishings, which can absorb a lot of the high frequencies. An equalizer can be set to reduce “boomy” low frequencies or replace lost high frequencies.

At best, human ears can detect sound from 20Hz to 20000Hz (or 20Hz – 20kHz). All natural (and some unnatural) sounds have many harmonics and overtones across the listening spectrum, giving them varying tonal characteristics. We often refer to the lowest frequencies as “Bass” and the highest frequencies as “Treble” but this only describes 2 regions of tone, whereas the listening spectrum could be divided into as many sections as desired in order to give more accurate measurement and manipulation of the sound characteristics.

EQ can also be used as a tool to push a signal forward in a mix or set it further back into the mix by boosting or cutting key mid frequencies, reducing feedback by cutting frequencies which are prone to resonance and boosting specific frequencies to lift certain instruments in a piece of music.

Connection

The unit can be used in 2 configurations...

1. As 2 independent mono graphic equalizers – e.g. for 2 separate microphones on channel inserts
2. As a stereo left & right EQ – e.g. as a main L+R EQ on master inserts or between the mixer and amp.

Before connecting to an amplifier or other equipment, turn down all volume controls to avoid loud noises which may cause damage to other equipment. Always switch amplifier power on last in line with volume levels down. Use good quality 6.3mm jack or XLR signal leads to connect the equalizer to allied equipment. The unit can be used as 2 independent mono equalizers (e.g. for 2 microphone channels, requiring specific EQ profiles). Connect mains power via the IEC (ensuring lead is in good condition and the voltage selector is same as the supply voltage) and switch the POWER on.

Operation

Begin with all frequency sliders and the GAIN controls in the centre position (no boost or cut) at 0dB. Switch the "IN/OUT" button to IN and the respective LED will light.

Adjust each frequency in turn to acquire the best response and reduce any problem frequencies.

Bear in mind that many loudspeakers cannot reproduce frequencies down as far as 20Hz and that the energy from the amplifier at these low frequencies is wasted as heat in the speaker coil. Therefore, the "LOW CUT" may be preferred to be on in sound reinforcement scenarios.

Also, with live PA situations, the crossover point between subs and mid-top cabs can generate phase problems which may be alleviated by reducing frequencies around this point.

Extremely high frequencies are often not feasible for live sound systems, due to the limitations of microphones and loudspeakers (and most people's ears) and 20kHz may be reduced to save wasted amplifier energy at these high frequencies.

For whichever particular application, experimentation and practice will eventually give the best results from your equalizer.

Specifications

Power supply	115/230Vac 50/60Hz - selectable (IEC)
Frequency response	20Hz - 20kHz
Input impedance : Balanced	40kohms
Input impedance : Unbalanced	20kohms
Output impedance : Bal/Unbal	330ohms
Channel separation	>50dB
Signal to noise ratio	>102dB
THD	0.01%
Dimensions	44 x 482 x 138mm
Weight	2.0kg
Power supply	115/230Vac 50/60Hz - selectable (IEC)
Frequency response	20Hz - 20kHz
Input impedance : Balanced	40kohms

Troubleshooting

No function and Power switch LED is not lit	Ensure mains voltage is correct and connected properly
	Ensure front panel power switch and mains outlet switch are on
Power is on but no audio output	Check XLR and/or jack leads are OK and connected properly
	Check that GAIN control and sliders are not set to -12dB
	Check that inputs and outputs are connected the correct way around
Distorted output	If overall frequency settings are above zero on average, reduce the Gain
	Reduce frequency sliders with very high settings to check which is distorting
Output is very low level	If output from mixer is XLR, connect via XLR to equalizer
	If input to amplifier is XLR, connect via XLR from equalizer
	If output from mixer is jack, connect via jack to equalizer
	If input to amplifier is jack, connect via jack from equalizer
	Increase Gain control(s) to compensate

Note: for further troubleshooting, refer equipment to qualified service personnel for testing

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© 2013. AVSL Group Ltd.