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EVI Audio XL4 Operators & Service Manual

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Operators & Service
Manual
XL4
EVI PRO AUDIO GROUP
Klark Teknik Building,
Walter Nash Road, Kidderminster
WorcestershireDY11 7HJ
England
Tel: (01562)741515 Fax: (01562)745371
1

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  • Page 1 Operators & Service Manual EVI PRO AUDIO GROUP Klark Teknik Building, Walter Nash Road, Kidderminster WorcestershireDY11 7HJ England Tel: (01562)741515 Fax: (01562)745371...
  • Page 3 DECLARATION OF CONFORMITY The Directive Covered by this Declaration 89/336/EEC Electromagnetic Compatibility Directive, amended by 92/31/EEC & 93/68/EEC Equipment Type Product Name Audio Mixing Console The Basis on which Conformity is being Declared The Products named above comply with the requirements of the above EU directives by meeting the following standards: EN 55013: 1990 EN 50082: 1992...
  • Page 4 ATTENTION! The following special limitations apply to the console and must be observed in order to maintain safety and electromagnetic compatibility performance: POWER CONNECTION The console should only be operated with the power supply connected to ground via its mains supply connector.

  • Page 5: Table Of Contents

    XL422 COMMS POD XL431 COMMS MODULE XL413 GRAND MASTER B VCA FADER XL422 MATRIX POD XL441 MATRIX MODULE XL4 MODULE OPTIONS FUNCTIONAL DESCRIPTION XL405 STEREO INPUT POD XL404 STEREO INPUT MODULE XL414 GROUP MODULE MIDAS XL4 CIRCUIT DESCRIPTIONS 1. EARTHING SYSTEM 2.

  • Page 6: Xl402 Input Pod

    XL4 FUNCTIONAL DESCRIPTION XL402 Input Pod. 1. The MIC control gives continuous adjustment of the mic amp gain from + 15dB to + 70dB 2. The PAD switch gives 20dB of attenuation to the mic signal and will allow the connection of high output microphones or line level signals.
  • Page 7 6. The treble FREQ control gives continuous adjustment of the frequency range that the treble equaliser acts on from 1K to 20K. 7. The treble BELL switch converts the treble equaliser from traditional MIDAS shelving re- sponse to full parametric operation. 8.

  • Page 8: Xl403 Input Vca Fader

    21. The mono aux PRE switches change the signal sent to the mono aux busses from post fader to pre fader. 22. The ST AUX controls (1 to 8) give continuous adjustment of the level sent from the input channel (post pan) to the stereo aux busses. The level adjustment is from + 6dB to off. 23.

  • Page 9: Xl412 Group Pod

    5. The VCA INPUT fader gives continuous adjustment of the input channel level from + 10dB to off. XL412 Group Pod. 1. The AUX switch changes the function of the left and right meters so that they monitor the aux send outputs in place of the audio group outputs.

  • Page 10: Xl413 Group Vca Fader

    busses. If a switch is pressed for a short time it will latch on or off, but if it is held on for more than 1 second the latching is disabled and when the switch is released the solo will turn off. 12.

  • Page 11: Xl422 Master Pod

    2. The ISOlate switches disconnect the vca sub group faders and mutes from automation screen recall. Screen storage is still active. 3. The vca MUTE switches mute any post fader input channel signals which are assigned to the corresponding vca sub group. 4.

  • Page 12: Xl413 Grandmaster A Vca Fader

    12. The AUX I/P MUTE mutes every aux line return input on the GROUP modules. 13. The INS LEFT and RIGHT switches connect the master left and right insert return signals to the stereo master mix. 14. MATRIX SEND PRE. Feeds to the matrix modules from the stereo busses are post fader as a default.

  • Page 13: Xl422 Comms Pod

    XL422 Comms Pod. 1. The METERS monitor the peak signal levels of the stereo AFL left and right solo busses or the PFL bus and local output level. The change over is automatic as part of the PFL MONITOR switch on the COMMS module. XL431 Comms Module.

  • Page 14: Xl413 Grand Master B Vca Fader

    16. The TALK XLR socket accepts balanced 150 Ohm microphone signals from - 50dBu to - 20dBu and uses an auto ranging gain system to bring the level to nominal 0dBu line level. 17. The TALK control gives continuous adjustment of the talk mic amplifier signal from + 6dB to off.

  • Page 15: Xl422 Matrix Pod

    that are assigned to grand master vca B will be summed onto the solo busses when the vca solo is active. Note i. When grand master vca B solo switch is active the PFL buss also receives signals but they are NOT a true representation of the relative levels within the grand master vca sub group.
  • Page 16 controls to the matrix from post fader to pre fader. 7. The MASTER LEFT controls give continuous adjustment of the master left signals that are sent to the matrix mixes. The adjustment is from + 6dB to off. 8. The MASTER RIGHT controls give continuous adjustment master right signals that are sent to the matrix mixes.

  • Page 17: Xl4 Module Options Functional Description

    XL4 MODULE OPTIONS FUNCTIONAL DESCRIPTION XL405 Stereo Input Pod. 1. The MIC control gives continuous adjustment of left and right mic amp gains from +15dB to +70dB. 2. The PAD switch gives 25dB of attenuation to the mic signals and will allow the connection of high output microphones or line signals.
  • Page 18 6. The LO MID control gives continuous adjustment of left and right boost and cut from +15dB to -15dB with a 0dB centre detent. 7. The lo mid FREQ control gives continuous adjustment of the frequency range that the lo mid equalisers act on from 100Hz to 2K.

  • Page 19: Xl414 Group Module

    XL414 Group Module (And Mic/Line Input). 1. The AUX SEND controls give continuous adjustment of the mono aux bus output levels from +10dB to off. 2. The aux send MUTE switches mute the aux bus outputs. 3. The aux send SOLO switches send mono aux bus signals to the PFL and AFL busses. If a switch is pressed for a short time it will latch on or off, but if it is held on for more than 1 second the latching is disabled and when the switch is released the solo will turn off.
  • Page 20 18. The ST switches connect the post fader audio sub group signals to the stereo master bus via the pan controls. 19. The group PAN controls place the audio groups within the stereo master mix and have a constant power law i.e. -3dB at the centre position. 20.

  • Page 21: Earthing System

    2. Power Supply. The XL4 has an external 3U 19” rack mounted power supply with an auto ranging input for 115 volt or 230 volt nominal operation. It generates six rails to power the console as follows:-...
  • Page 22 - 18 volts at 20 amps referenced to 0VA + 48 volts at 0.7 amps referenced to 0VA +15 volts at 10 amps referenced to 0VF - 15 volts at 10 amps referenced to 0VF + 5 volts at 10 amps referenced to 0VD All rails in the power supply are floating until it is connected to the console which connects the chassis and signal zero volt references as described previously.

  • Page 23: Mono Input Pod

    3. Mono Input Pod. The input pod has separate mic and line inputs, hi and lo pass filters, a direct output and a 20 led meter. The mic input signal passes through T filters L1 and L2, via a switchable 20dB pad and AC coupling capacitors C2 and C3 on to the base of low noise transistors Q4 and Q6.

  • Page 24: Mono Input Module

    4. Mono Input Module. The input module houses the analogue insert, EQ, VCA, mute, pan and bus feed circuits along with logic circuits to control routing and other major functions. Audio signals are received from the input pod via differential amplifier IC9 and fed to the insert and EQ circuits.

  • Page 25: Stereo Input Pod (Option)

    increase current drive capabilities of the buffers when required. Crosstalk and noise are kept to a minimum within the module and the console bus system by use of an active ground reference system. A “clean” 0VA or noise reference is sent from the master module to all the input modules. This is buffered by IC27 which provides the active ground reference which is summed into all the bus send circuits and provides a clean earth for all the aux output potentiometers.

  • Page 26: Stereo Input Module (Option)

    gain of the circuits by 55dB. It does this by effectively shorting out the negative current feedback to greater or lesser extents. High frequency stability and constant bandwidth at all gains is assured by capacitors C10, C14, C15, C28, C32, C33 and C34. The nominal differential gain of the mic amp is 15dB to 70dB.
  • Page 27 The insert return circuits are fed via T filters in the frame to differential amplifiers IC3 and IC5. Pre-sets VR2 and VR7 provides CMR adjustment and capacitors C9, C10, C11, C12, C23, C24, C25 and C26 provide additional high frequency filtering; C13, C14, C27 and C28 provide AC coupling.

  • Page 28: Group Module (And Mic Input Option)

    summed into all the bus send circuits and provides a clean earth for all the aux output potentiometers. VR5 adjusts the DC offset on the active earth to a minimum. This is necessary to reduce transient noise as signals are switched off or on to a bus. FET’s Q18, Q19, Q22, Q23, Q25 and Q26 are used to connect pre fade and post fade stereo signals to the solo busses.
  • Page 29 clipping and it is matched by pre-set VR1 so as to give the maximum CMR when the signals are de-balanced by amplifier IC2. The differential gain of this stage is adjustable from +36dB to -4dB by half of VR3. The signal then passes to a simple shelving EQ formed by amplifier IC2 and potentiometers RV1 and RV2 before entering the VCA IC3.
  • Page 30 and AC coupling is via C87 and C93. The aux send signal can be sent to the solo busses via CMOS switch IC12 which is controlled by NAND gate IC13. Sections A and B of the NAND gate form a bi-stable flip flop which is trig- gered by switch SW15 and capacitor C64.

  • Page 31: Master Module

    low charge held on C155; once this capacitor has charged to a logic high the solo can be cleared by the solo clear bus via section C of IC26. If the solo switch is held down capacitor C151 dis- charges and resets the flip flop; the solo is now held on by diode D90 until the switch is released. The group signal can also be soloed as part of a vca solo group;...

  • Page 32: Comms Module

    C107. Further filtering is achieved by T filters in the console frame and AC coupling is via C86, C87, C97 C98, C108 and C109. The signal mutes are switched from switches SW6, SW7 and SW8 which toggle the bi-stable flip flops formed by invertor IC28 via capacitors C123, C125 and C127.
  • Page 33 IC5. It is possible to link the talk and comms system via SW5; when the link is active the output from amplifier IC3 is summed into amplifier IC5 via resistor R10. The amplified comms signal passes via the comms on switch SW6 to the output/input isolation transformer T1 and the side tone comms cancellation circuit formed by the second half of differ- ential amplifier IC5.
  • Page 34 also applied to control the oscillation via resistor R128. This is shorted out by FET Q4 if the oscillation amplitude is too low but once the oscillation amplitude is high enough diode D23 charges capacitor C89 negative which feeds the gate of the FET, raising its impedance and allow- ing enough negative feedback to provide controlled oscillation.

  • Page 35: Matrix Module

    The comms module plays no part in the cancelling mode of operation but it is used to select the additive mode via section A of invertor IC37 and section A of NAND gate IC36. These gates form a bi-stable flip flop which is triggered by the solo add switch SW26 and capacitor C181. When additive mode is active section B of IC36 holds the solo clear line low via diode D66.
  • Page 36 IC32. Pre-sets VR10 and VR13 provides CMR adjustment and capacitors C77, C78, C81, C82, C96, C97, C98 and C99 provide additional high frequency filtering; C83, C84, C100 and C101 provide AC coupling. The inserts are selected in or out by switches SW7 and SW8. Post insert signals are fed to the VCA circuits formed by amplifier IC30 and VCA’s IC29 and ICE.

  • Page 37: Led Meters

    The stereo aux signal can be sent to the solo busses via CMOS switch IC5 which is controlled by NAND gate IC8. Sections A and C of the NAND gate form a bi-stable flip flop which is triggered by switch SW3 and capacitor C40. When a solo is first enabled capacitor C38 creates a negative going pulse which is inverted and buffered by section B of IC8.
  • Page 38 for the bar graphs to run from whilst transistors Q3 and Q4 provide constant current for the bar graph leds. this is programmed by transistor Q5 which is driven from the console led I ref bus. Transistors Q6 and Q7 provide adjustable current for the switch indicator led D21.

  • Page 39: Midas Xl4 Technical Specification

    XL4 Technical Specification. Input Impedance 2K Balanced Line 20K Balanced Input Gain ( all faders at 0dB ) Continuously variable from + 15dB to + 70dB Mic + Pad Continuously variable from -5dB to + 50dB Channel Continuously variable from...
  • Page 40 Line to Mix Noise ( 48 channels routed at 0dB, pan centre ) - 75dB Distortion at 1kHz Mic to Mix ( + 60dB gain, 0dBu output ) < 0.03% Line to Mix ( 0dBu )< 0.03% Crosstalk at 1 kHz Channel to Channel <...
  • Page 41 Colour Green Up to + 9dBu Normal signal Colour Yellow + 12dBu to + 15dBu High signal Colour Red Over + 18dBu Signal Too High Quantity 77 ( Monitoring all main inputs and outputs ) Equaliser Low pass slope 12dB / Oct. Low pass frequency Continuously variable - 3dB point from 1K to 40K Hi pass slope...
  • Page 42 Bass Gain Continuously variable + 15 dB to - 15 dB Centre detent = 0dB Bass Shelving Freq. Continuously variable 3dB point from 20Hz to 400Hz Bass Bell Freq. Continuously variable centre from 20Hz to 400Hz Dimensions Width 2176 mm Depth 1120 mm Height 420 mm Nett Weight...

  • Page 43: Schematic Diagrams

    MIDAS XL4 SCHEMATIC DRAWINGS XL490-02 Power supply LED board XL490-01 Power supply filter board XL402-1 Input pod XL402-2 Input pod XL402-3 Input pod XL402-4 Input pod XL402-5 Input pod XL401-1 Input module - Input, inserts & EQ XL401-2 Input module - VCA, muting & direct out XL401-3 Input module - Pan, VCA &...
  • Page 44 Matrix module - Aux sends XL441-6 Matrix module - Aux sends,decoupling and edge connectors 20 LED switching I/O XLR P.C.B Jack bay field Jack bay field XL4.MTX1 MTX mother upper connectors XL4.MTX.2 MTX mother lower connectors XL4_IP1 IP mother upper connectors XL4_IP2 IP mother lower connectors XL4.IP3...

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