LA Audio Electronic EQX20 Manuale utente

Dual 3 Band, Mono 6 Band

Parametric Equaliser

OPERATION MANUAL

Page 2

Version - V1 April 2000

Page 3

CONTENTS

1. Introduction Page 3

2. Installation Page 4

2.1 Inspection and un-packing

2.2 Operating environment

2.3 CE standards

2.4 Power requirements

2.5 Signal levels

2.6 External connections

3. Warranty Page 7

4. Description of controls Page 8

4.1 Channel 1 Page 8

4.2 Channel 2 Page 10

5. Applications Page 11-12

5.1 Setting up and using the EQX20

Audio sweetening and Precision equalisation

Removing subsonics

Making compressors frequency conscious

Special effects

Enhancing the EQ on a mixing console

6. Circuit description Page 13

7. Specifications Page 14

6. Blank panel drawings Page 15

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1.0 INTRODUCTION

The EQX20 is a two channel 3 band Parametric Equaliser which can also

be configured as a single channel 6 band unit. Each band offers variable

Frequency, 15dB cut and boost and variable Q (Bandwidth).

Having all parameters fully variable makes the EQX20 a powerful tool

capable of a range of effects from subtle fine tuning through to radical tonal

changes.

Each channel has a high pass filter switch intended to remove subsonics

such as stage noise and tightening bass sounds.

The facilities provided by the EQX20 are summarised as follows -

• 2 Channel 3 band or single channel 6 band parametric EQ

• Wide frequency sweep (40:1) on each band

• Q variable between 12 (1/12th octave = 1 semitone) to 0.3 (3 octaves)

• ±15dB gain on each band

• High pass filter on each channel

• Bypass switching on each channel

• Balanced inputs on XLR and TRS jack

• Balanced impedance, ground compensated outputs on XLR and TRS

jack

• +4dBu and -10dBV input and output levels

• Low noise and distortion

Typical applications for the EQX20 include -

• Audio sweetening

• Precision equalisation

• Feedback elimination

• Hum, subsonic and noise removal

• Making a compressor frequency conscious

• Special effects

• Enhancing the EQ on a mixing console

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2.0 INSTALLATION

IMPORTANT: PLEASE READ THIS SECTION BEFORE USING THE EQX20

2.1 INSPECTION AND UNPACKING

The EQX20 has been carefully packed at our factory in a carton designed

to withstand handling in transit. Should the unit appear to have been

damaged in transit notify your dealer immediately and do not discard any of

the packing. The carton should contain -

• The EQX20 unit

• Power cord

• Operator Manual (this book)

2.2 OPERATING ENVIRONMENT

The EQX20 is designed to operate between 0 and 50°C (32-122°F) with

relative humidity no more than 80%. Should the unit be installed in an

equipment rack, ensure that the environment conforms to these levels.

2.3 CE STANDARDS AND THE LOW VOLTAGE DIRECTIVE (LVD)

The EQX20 has been designed to meet the latest Electromagnetic

Compatibility (EMC) regulations. However we recommend you do not

operate the unit close to strong emitters of electromagnetic radiation such

as power transformers, motors, mobile telephones or radio transmitters.

The unit should only be connected to a power supply of the type described

in 2.4 POWER REQUIREMENTS or as marked on the unit. The unit must

be earthed for safe operation. Disconnect the mains supply before

removing any cover.

2.4 POWER REQUIREMENTS

There is a mains fuse located inside the unit which is accessed by

removing the cover. This fuse is for protection against unit faults and as

such will not normally need replacing. If you think you have a power related

problem please refer to your dealer.

The voltage and fuse rating have been factory set for -

230V 50mA UK

220V 50mA Republic of Korea

115V 100mA North America

• The correct voltage and fuse rating is indicated on the rear panel.

Page 6

• Please check that your unit is correctly rated for the voltage of

the country of operation.

If the fuse requires changing at any time please ensure the correct fuse is

fitted. An incorrect fuse could cause damage to the unit and may constitute

a fire hazard.

If you carry your EQX20 from one country to another it is very important to

ensure the voltage is compatible.

For your information the unit can be internally rewired for use in 230V, or

110-125V countries - contact your dealer for information. A special 100V

version is available for Japan and a 220V, 60Hz version for Republic of

Korea.

The mains lead connections to the appliance are coloured in accordance

with the following code:

Green-and-Yellow Earth

Blue Neutral

Brown Live

• WARNING: THIS APPLIANCE MUST BE EARTHED

2.5 SIGNAL LEVELS

The EQX20 will accommodate both -10dB and +4dB operating levels

without the need for level switching.

PLEASE NOTE: the XLRs are set for +4dBu and the TRS jacks for -10dBV

operating levels. Use the appropriate connector/level to interface between

your equipment and the EQX20.

Using the TRS jack input with +4dB signal levels in some set-ups will over

drive the EQX20 and cause distortion.

Signals in excess of +20dB will cause the unit to distort.

2.6 EXTERNAL CONNECTIONS

Fig 2.6.1 EQX20 rear view showing Input and Output connections

Page 7

The input and outputs of the EQX20 are balanced on both XLR and 1/4"

TRS jack connectors. For balanced input and outputs, connections to the

unit should be wired as follows:

TRS jack-10dBV Tip Hot (signal +)

Ring Cold (signal -)

Sleeve Screen (signal ground)

For un-balanced operation join Ring and Sleeve on input, output or both

Sleeve

Screen

Ring

Cold (-)

Tip

Hot (+)

XLR +4dBu Pin 1 Screen (Signal ground)

Pin 2 Hot (+ve)

Pin 3 Cold (-ve)

For un-balanced operation join pins 1 and 3 on input, output or both

Pin 1 = Screen

Pin 2 = Hot (+)

Pin 3 = Cold (-)

PUSH

The 20kΩinput impedance of both inputs is suitable for most types of

equipment.

Plugging a mono jack lead into the TRS input will effectively un-balance the

signal connection.

Page 8

3.0 WARRANTY

Your LA Audio EQX20 has been manufactured to a high standard using

quality components. If correctly installed and operated the unit should give

years of problem free operation.

However in the event of a defect in material or workmanship causing failure

of the unit within five years of the date of original purchase we will agree to

repair, or at our discretion replace, any defective item without charge for

labour or parts. To receive service under this warranty it is necessary to

return the unit to an LA Audio authorised service centre or to the factory

with a dated receipt as proof of purchase. After repair the unit will be

returned to you free of charge.

Limitations:

This warranty does not cover damage resulting from accident or misuse.

The warranty is void unless repairs are carried out by an authorised service

centre. The warranty is void if the unit has been modified other than at the

manufacturers instruction. The warranty does not cover components which

have a limited life, and which are expected to be periodically replaced for

optimal performance. We do not warrant that the unit shall operate in any

way other than as described in this manual.

Page 9

4.0 DESCRIPTION OF CONTROLS

4.1 CHANNEL 1

LF control

This control sets the amount of cut or boost for the LF (Low Frequency)

section. Gain range on the EQX20 is ±15dB. The following diagram shows

the effect of different cut and boost settings.

Maximum cut or boost occurs at the centre frequency set by the

FREQUENCY control.

Qcontrol

Varies the 'Q' (bandwidth) of the cut or boost region. A low Q, CW (clock

wise) affects a wide band of frequencies whilst a high Q, CCW affects a

very small band. The Q control on the EQX20 has a range of 0.3 (3

octaves) to 12 (1/12th octave). The following diagram shows the effect of

different Q settings.

Page 10

In general lower Qs are used when boosting and higher Qs when cutting -

see applications

FREQUENCY control

This control adjusts the centre frequency for LF cut or boost

The LF FREQUENCY control has a 40:1 range and is adjustable from

20Hz, CCW to 1kHz, CW. The following diagram shows the effect of

changing the centre frequency.

MF control

Sets the amount of cut or boost for the MF (Mid Frequency) section.

FREQUENCY control

This control varies the cut or boost centre frequency for the MF (mid

Frequency) section. Control range is 200Hz, CCW to 8kHz, CW.

Qcontrol

Varies the 'Q' of the cut or boost region for the MF section.

HF control

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