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Dual 3 Band, Mono 6 Band
Parametric Equaliser
OPERATION MANUAL
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Version - V1 April 2000 Page 2
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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 subs
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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 tighteni
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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
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• 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
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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 Ring Tip Screen Cold (-) Hot (+) XLR +4dBu Pin 1 Screen (Signal ground) Pin 2 Hot (+ve) Pin 3 Cold (-
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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 i
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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 hig
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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
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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
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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. Primarily intended to remove subs
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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. Use maximum (or nearly) boost so the effect of the EQ can
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Kick drum Slap at 3-5kHz Floppy around 600-650Hz Bass at 40-125Hz Boomy below 80Hz Snare drum Crack at 2-3kHz 'In the way' 1kHz Body at 125Hz to 300Hz Bottom 80Hz Page 14
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INSTRUMENT BOOSTING CUTTING Hi-Hat and Sparkle above 5kHz 'In the way' at 1kHz Cymbals Ring around 250Hz Toms Slap at 3.5-5kHz Boomy around 300-350Hz Bass 60-250Hz Bass guitar Slap at 1kHz String noise at 1kHz Bite at 2.5kHz Boomy at 125-220Hz Bass 40-100Hz Acoustic guitar Sparkle above 4kHz Boomy at 200-250Hz Body at 125Hz Tinny at 2-3.5kHz Electric guitar Sex 600-900Hz Boomy below 80Hz Bass 125-250Hz 'In the way' 1-3kHz Bite 2.5kHz Sparkle at 3-5kH
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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. Page 16
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6.0 CIRCUIT DESCRIPTION Audio input High pass Equaliser filter 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. FILTER
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7.0 SPECIFICATIONS INPUTS Type electronically balanced XLR-F +4dBu, wired pin 2 = hot (signal +) 1/4' TRS jack -10dBV, wired Tip = hot Impedance 20kΩ Maximum input +20dBu OUTPUTS Type Ground sensing, balanced impedance XLR-M +4dBu, wired pin 2 = hot (signal +) 1/4" TRS jack -10dBV, wired Tip = hot Impedance 100Ω (+4dBu output) Max. output +20dBu PERFORMANCE THD < 0.01%, +4dBu output Noise < -86dBu (20Hz to 20kHz) Frequency response ±1dB, 20
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Dimensions 1.75" (44mm)H x 19" (482mm)W x 6.5" (165mm)D Weight Unit = 2.2kg, Shipping = 2.85kg LA Audio reserves the right to alter any feature or specification without prior notice E&OE Page 19
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