Dual 3 Band, Mono 6 Band Parametric Equaliser OPERATION MANUAL
Version - V1 April 2000 Page 2
CONTENTS 1. Introduction Page 3 2. Installation Page 4 2.1 2.2 2.3 2.4 2.5 2.6 Inspection and un-packing Operating environment CE standards Power requirements Signal levels External connections 3. Warranty Page 7 4. Description of controls Page 8 4.1 4.2 Channel 1 Channel 2 Page 8 Page 10 5. Applications 5.
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.
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.
• 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.
The input and outputs of the EQX20 are balanced on both XLR and 1/4" TRS jack connectors.
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.
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. Q control 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.
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.
Sets the amount of cut or boost for the HF (High Frequency) section. FREQUENCY control Adjusts the cut or boost centre frequency for the HF section. Control range is 500Hz, CCW to 20kHz, CW. Q control Varies the 'Q' of the cut or boost region for the HF section. CLIP led The CLIP led monitors the last stage of the EQ section and indicates signal levels approaching clipping. The led lights at 3dB before clipping so momentary peaks are monitored but are not necessarily audible.
BYPASS switch Pressing BYPASS switches the EQ out of the signal path and allows A/B comparison. Remember if you are using any amount of boost, BYPASSing the EQ will cause a noticeable drop in signal level. In MONO mode Channel 2 BYPASS is inoperative and Channel 1 BYPASS now switches the whole EQ in and out of circuit. 75Hz switch Pressing this switch inserts a 75Hz, 12dB/Octave slope high pass filter into the signal path before the EQ section.
5.0 APPLICATIONS 5.1 Setting up and using the EQX20 Refer to Section 2.6 External connections on page 5 for connecting to and from the EQX20. Now unless you are familiar with operating parametric equalisers a good starting point will be ..... Set all Q controls to 12 o'clock, this gives a Q of around 0.5 (2 octaves) which is similar to that found on mixers fitted with fixed Q, swept frequency mid range controls.
Kick drum Slap at 3-5kHz Bass at 40-125Hz Snare drum Crack at 2-3kHz 'In the way' 1kHz Body at 125Hz to 300Hz Bottom 80Hz Page 14 Floppy around 600-650Hz Boomy below 80Hz
INSTRUMENT BOOSTING CUTTING Hi-Hat and Cymbals Sparkle above 5kHz Ring around 250Hz 'In the way' at 1kHz Toms Slap at 3.5-5kHz Bass 60-250Hz Boomy around 300-350Hz Bass guitar Slap at 1kHz Bite at 2.5kHz Bass 40-100Hz String noise at 1kHz Boomy at 125-220Hz Acoustic guitar Sparkle above 4kHz Body at 125Hz Boomy at 200-250Hz Tinny at 2-3.5kHz Electric guitar Sex 600-900Hz Bass 125-250Hz Bite 2.
Adding a high Q peak around 1kHz with the MF section will further enhance this effect. ENHANCING THE EQ ON A MIXING CONSOLE Patch the EQX20 into the insert points on your console to add further equalisation capabilities when treating individual sounds. Or patch into Group inserts for equalising sub-mixes or into the Stereo inserts for overall mix EQ.
6.0 CIRCUIT DESCRIPTION Audio input High pass filter Equaliser Bypass Bypass Audio output Clip Fig: 6.0.1 Block diagram of the LA EQX20 showing the main signal paths AUDIO PATH The input signal first passes through the electronically balanced input stage which provides RF filtering and rejection of common mode noise signals. The signal then passes through the High pass filter and equalisation stages and is output via the ground compensated output amplifier.
7.0 SPECIFICATIONS INPUTS Type XLR-F 1/4' TRS jack Impedance Maximum input electronically balanced +4dBu, wired pin 2 = hot (signal +) -10dBV, wired Tip = hot 20kΩ +20dBu OUTPUTS Type XLR-M 1/4" TRS jack Impedance Max. output Ground sensing, balanced impedance +4dBu, wired pin 2 = hot (signal +) -10dBV, wired Tip = hot 100Ω (+4dBu output) +20dBu PERFORMANCE THD Noise Frequency response < 0.
Dimensions Weight 1.75" (44mm)H x 19" (482mm)W x 6.5" (165mm)D Unit = 2.2kg, Shipping = 2.
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