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Telex Communications Forum FOH User Manual

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Forum FOH
User Manual
Klark Teknik Building
Walter Nash Road
Kidderminster
Worcestershire
DY11 7HJ
Tel: +44 (0) 1562 741515
Fax: +44 (0) 1562 745371
Email:
info@uk.telex.com
Website:
www.ddaconsoles.com
Forum FOH User Manual
 Telex Communications (UK) Limited
In line with the company's policy of continual improvement, specifications and function maybe subject
to change without notice. This Operator Manual was correct at the time of writing. E&OE.

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Summary of Contents for Telex Communications Forum FOH

  • Page 1 Website: www.ddaconsoles.com Forum FOH User Manual  Telex Communications (UK) Limited In line with the company’s policy of continual improvement, specifications and function maybe subject to change without notice. This Operator Manual was correct at the time of writing. E&OE.

  • Page 2: Table Of Contents

    Contents DECLARATION OF CONFORMITY ............3 INTRODUCTION ..................4 SAFETY PRECAUTIONS................5 TRANSPORT ....................6 ATTENTION ....................6 WARRANTY ....................7 SPECIFICATIONS ..................9 GLOSSARY ....................11 MODULE DESCRIPTIONS ..............16 MONO INPUT MODULE ................. 18 MONO MUTE INPUT ................23 STEREO INPUT MODULE ..............

  • Page 3: Declaration Of Conformity

    Declaration of Conformity The Manufacturer of the Products covered by this Declaration is Klark Teknik Building, Walter Nash Road, Kidderminster, Worcestershire, DY11 7HJ. The Directives Covered by this Declaration. 89/336/EEC Electromagnetic Compatibility Directive, amended by 92/31/EEC & 93/68/EEC 73/23/EEC Low Voltage Equipment Directive, amended by 93/68/EEC. The Products Covered by this Declaration.

  • Page 4: Introduction

    INTRODUCTION The Forum console is a high quality console, designed for use in live sound and recording applications. Two output modulesR a standard output module and a matrix output module are available, along with a number of input modules as follows Q- mono standard input and mono mute input stereo input and stereo mute input dual effect return...

  • Page 5: Safety Precautions

    SAFETY IMPORTANT - PLEASE READ BEFORE PRECAUTIONS INSTALLING YOUR FORUM CONSOLE Strong sources of electromagnetic radiation e.g. high power cabling, video monitors and radio transmitters may cause degradation of of the audio quality due to induced voltages in the chassis and connection leads. Site the console away from such sources.

  • Page 6: Transport

    TRANSPORT We recommend that you retain all the packing from your FORUM console should you ever need to return it for service or move the console to other prenises. If the console has to be moved regularly then we suggest that you purchase a foam lined flight case available from your distributor if you cannot purchase one locally.

  • Page 7: Warranty

    WARRANTY If within a period of twelve months from the date of delivery of the equipment to the End User it shall prove defective by reason only of faulty materials and/or workmanship Pbut no faulty design) to such an extent that the effectiveness and/or the usability thereof is materially affected, the Equipment or the faulty component shall be returned to the Distributor or DDA and subject to the following conditions the Distributor or DDA will repair or at its option...
  • Page 8 Benefit of this Warranty may not be assigned by the End User. End Users who are consumers should note that their rights under this Warranty are in addition to and do not affect any other rights to which they may be entitled against the seller of the Equipment.

  • Page 9: Specifications

    SPECIFICATIONS Note Q All specifications relate to dBu, ie 0dBu = 0.775V RMS Maximum Gain Mic Input to Mix OutputQ 86dB Line Input to Mix OutputQ 30dB Frequency Response Mic Input to Mix OutputQ 20Hz , -0.50dB Pgain 55dB) 20kHz, -0.20dB Line Input to Mix Output 20Hz , -0.50dB Pgain 0dB)
  • Page 10 LED Bargraph Metering P20 segment) Rise Time to 0dBu Peak Q 1mS Average Q 150mS Release Time to -20dBu Peak Q 2 S Average Q 250mS Accuracy Prelative to 0dB) +/-0.5dB Forum Power Supply specifications AC Mains Voltage selectionQ Internal link settings for 90V, 100V, 120V, 220V, 230V, and 240V Power Consumption Pmax) Q AC Mains frequency Q 50Hz...60Hz Fuse ratingsQ...

  • Page 11: Glossary

    This section provides a simple explanation of some of the terms GLOSSARY used when describing the console features. ìAî GAUGE JACK This is a 1/4O jack which has a large tip diameter compared with a ìBî gauge jack which has a smaller diameter tip and is usually found in broadcast use.
  • Page 12 DIRECT OUTPUT This refers to the individual output of a channel which is available even if the channel is not routed. Electronically Balanced Output. Equalizer or Tone Control. FOLDBACK This is the signal which is usually fed to the artistes headphones.
  • Page 13 Low Frequency. LINE INPUT An input designed to accept high level signals as opposed to microphone level signals. The expected level is usually +4dB but increasingly inputs and outputs are being designed so that they can be altered to operate at -10dBV which is now quite a common operating level.
  • Page 14 A signal derived before a fader and therefore not dependant upon the position of the fader. POST A signal derived after a fader and therefore dependant upon the position of the fader. Associated with peaking equalisers the Q is the factor which describes how wide the peak or trough of enhancement is.
  • Page 15 SLATE The ability to talk to tape from the operating position of the console. On the DCM it is possible to slate both the multi-track group outputs and the stereo mix bus. Solo in Place SWEEP FREQUENCY A control which selects a centre frequency to operate around. Most often used with peaking equalisers but it can also be used to determine the roll off point of shelving EQs as well.

  • Page 16: Module Descriptions

    MODULE DESCRIPTIONS The input modules are provided with rear panel connectors for Microphone Pon XLR), and Line Pjack), both balanced. Insert send and return signals are available on a single stereo jack socket, and are unbalanced. A Direct Output, unbalanced and ground sensing, is also available via a jack socket on the rear panel.
  • Page 17 With the gain control at minimum, the maximum input level is +14dBu without the 20dB pad. The gain of the line input may be adjusted from -10dB to +20dB corresponding to a sensitivity of +14dBu to -16dBu to give an output of +4dBu at the stereo mix outputs.

  • Page 18: Mono Input Module

    MONO INPUT MODULE +48V Provides 48 volt phantom power for a condenser microphone, or DI box. Optional balancing transformers may be fitted on the Mic input. Switching in PAD inserts a 20dB attenuator in circuit with the microphone input. This may be used when high-output microphones are employed, or to enable the use of the mic input for line-level signals.
  • Page 19 EQUALISER The equaliser on the mono input module is a four band design, incorporating two sweepable peaking mid-range sections and fixed frequency shelving high and low controls. Shelving section, providing +/-15dB of gain at 12kHz. HI MID Peaking section, providing +/- 15dB of gain, at frequencies from 470Hz to 15kHz.
  • Page 20 AUXILIARIES The Forum console has six auxiliary buses, accessed on the Standard Input module from 4 controls. In addition, the channel direct output may be controlled via one pot, to provide extended auxiliary sends. AUX 1 Controls the level of the channel signal fed to the Aux 1 bus. This signal is normally post-fader, unless the PRE button, just below, is depressed.
  • Page 21 ROUTING AND STATUS Routes the post-fade, post-pan channel signal to the stereo mix bus. 1-2 P3-4, 5-6, 7-8) Routes the post-fade, post-pan channel signal to output buses 1 and 2 P3 & 4, 5 & 6, 7 & 8). When PAN is set to centre, equal levels are sent to both buses, with a 4.5dB drop relative to fully clockwise or anti-clockwise.
  • Page 22 CONNECTORS AND PIN DEFINITIONS Mic Input Q 3 Pin XLR type, Balanced Nominal Input LevelQ -72dBu to -2dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Input Impedance Q >2 kOhm Line Input Q 1/4O TRS Jack Socket, ëAí Gauge, Balanced Nominal Input LevelQ -16dBu to +14dBu Q Signal +ve PHot) Ring...

  • Page 23: Mono Mute Input

    MONO MUTE INPUT The input and equaliser sections on this module are the same as those on the Mono Standard Input Module. The differences occur in the remainder of the module as follows. AUXILIARIES 1 and 2 Independent level control is provided for these two auxiliaries with a common switch to select the prefade signal as the source.
  • Page 24 CONNECTORS AND PIN DEFINITIONS Mic Input Q 3 Pin XLR type, Balanced Nominal Input LevelQ -72dBu to -2dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Input Impedance Q >2 kOhm Line Input Q 1/4O TRS Jack Socket, ëAí Gauge, Balanced Nominal Input LevelQ -16dBu to +14dBu Q Signal +ve PHot) Ring...

  • Page 25: Stereo Input Module

    STEREO INPUT MODULE The Stereo Input module has two stereo input sources. Input A is for a stereo Microphone, while input B is for a line-level stereo input, which can be optionally configured as a phono PRIAA equalised) input by purchasing the RIAA adapter card. Sum-and-Difference, or MS decoding is provided either at Mic or line level signals using a combination of the mono and phase reverse switches.
  • Page 26 EQUALISER The equaliser on the stereo input module is a four-band design with two swept mids, and shelving high and low frequencies. Shelving section, providing +/-15dB of gain at 12kHz. HI-MID Peaking section, providing +/-15db of gain, at a centre frequency adjustable from 470Hz to 15kHz.
  • Page 27 AUX 1 Controls the level of the channel signal fed to the Aux 1 bus. This signal is normally post-fader, unless the PRE button just below the AUX 1 control is pressed. Feeds the AUX 1 control with a signal taken pre-fader instead of post-fader.
  • Page 28 ROUTING When any routing button is pressed, the BAL control is automatically inserted into circuit, allowing the signal to be balanced in the stereo image. If the channel is selected to mono Psee Left/Right Cut switches) the Balance control will operate in a similar manner to the Pan control on mono inputs, but with a limited range of control P+/-3dB).
  • Page 29 The ON switch enables the channel signal path, and is indicated by an LED in the switch when the channel is active. When OFF, all post-fade auxiliary sends and routing assignments are muted. The PFL button Por SOLO) feeds the post-EQ, pre-fader signal to the monitor section Ploudspeakers or headphones), replacing the master signal.
  • Page 30 CONNECTORS AND PIN DEFINITIONS Input AQ Mic Input Q 3 Pin XLR type, Balanced Nominal Input LevelQ -72dBu to -2dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Input Impedance Q >2 kOhm Input BQ Line Q 1/4O TRS Jack Socket, ëAí...

  • Page 31: The Stereo Mute Input Module

    THE STEREO MUTE INPUT MODULE This module is identical to the standard stereo input module other than for the addition of the 8 mute group switches. These switches assign the channel to one or more mute groups and will cause the channel to CUT if the master cut for the assigned mute group is operated.

  • Page 32: The Dual Effect Return Module

    THE DUAL EFFECT RETURN MODULE This module contains two independent signal paths which can be used to bring line level signals down onto the stereo mix bus of the console. As both signal paths are identical it is only neccessary to describe one.
  • Page 33 CONNECTORS AND PIN DEFINITIONS Line Input Q 3 Pin XLR type, Balanced Nominal Input LevelQ -16dBu to +14dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Input Impedance Q >10 kOhm Line Input Q TRS Jack Socket, ëAí Gauge, Balanced Nominal Input LevelQ -16dBu to +14dBu Q Signal +ve PHot) Ring...

  • Page 34: Into 1 Microphone Input

    6 INTO 1 MICROPHONE INPUT Six microphone inputs are available on this dual width module. Individual gain and level controls and an ON switch are available to each input. GAIN The gain of a microphone input can be adjusted from 6dB to 76dB. This adjusts the level of any input before being mixed with the other input signals.
  • Page 35 CONNECTORS AND PIN DEFINITIONS Mic Input Q 3 Pin XLR type, Balanced Nominal Input LevelQ -72dBu to -2dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Input Impedance Q >2 kOhm FORUM OPERATION AND MAINTENANCE MANUAL 9601 PAGE 35...

  • Page 36: The Digital Stereo Input Module

    THE DIGITAL STEREO INPUT MODULE The Digital Stereo Input module accepts any one of 3 analog or 2 digital stereo signal sources. The signal source is selected by electronically latching push-buttons. Three pairs of phono/cinch PRCA) connectors are provided for the 3 analog signal sources PPhono, CD, Line).
  • Page 37 STEREO EQUALISER The Digital Input EQ is a four-band design. Shelving section, providing +/-12dB of gain at a frequency of 12kHz. HI MID Peaking Pbell) section, providing +/-12dB of gain at a centre frequency of 3kHz. LO MID Peaking Pbell) section, providing +/-12dB of gain at a centre frequency of 300Hz.
  • Page 38 AUX 3 Controls the level of the mono sum of the channel signal fed to the AUX 3 bus. Internal links determine whether the feed is pre or post-fader. AUX 4 Controls the level of the mono sum of the channel signal fed to the AUX 4 bus.
  • Page 39 When BAL is set to centre, equal levels are sent to both buses, with a 3dB drop relative to fully clockwise or anti-clockwise. Setting the BAL control fully clockwise sends a level of 3dB higher on the right bus and a level of 3dB lower on the left bus. The ON switch enables the channel signal path, and is indicated by an led in the switch when the channel is active.
  • Page 40 CONNECTORS AND PIN ASSIGNMENTS Line Input Q Cinch/Phono/RCA, unbalanced PCD, Line) Nominal Input Level Q -20dBu to +10dBu Phono Tip Q Signal PHot) Phono OuterQ Ground Input Impedance Q >10 kOhm Phono Input PRIAA) Q Cinch/Phono/RCA, unbalanced Nominal Input level Q -54dBu to -24dBu Phono Tip Q Signal PHot) Phono OuterQ Ground Input Impedance Q 47 kOhm / 100pF...

  • Page 41: 10 Way Selector Module

    10 WAY SELECTOR MODULE This module provides additional inputs for the 2 TRK position of the monitor selection switch on the master module. An EDAC connector is used to provide the 10 stereo input connections while 2 male XLR connectors provide outputs which can then be connected by external cables to the 2 track input of the master module.
  • Page 42 EDAC TABLE FOR Q EXTERNAL SELECTOR MODULE PAIR + , - DESCRIPTION 1 LEFT 1 RIGHT 2 LEFT 2 RIGHT 3 LEFT 3 RIGHT 4 LEFT 4 RIGHT 5 LEFT 5 RIGHT 6 LEFT 6 RIGHT 7 LEFT KK,DD 7 RIGHT LL,EE 8 LEFT MM,F 8 RIGHT JJ,NN 9 LEFT...
  • Page 43 VIEWED FROM SOLDER SIDE All unlabelled pins are bussed as Audio Ground FORUM OPERATION AND MAINTENANCE MANUAL 9601 PAGE 43...

  • Page 44: The Standard Output Module

    THE STANDARD OUTPUT MODULE The FORUM Group Output Module supplies the Group Output signal, and also two return inputs, for use with multitrack tape machines, or external effects devices. The group outputs are electronically balanced, but may also be transformer balanced as a cost-option.
  • Page 45 RETURN SECTION A Pto stereo mix) EQUALISER The two band equaliser features +/- 15dB of gain at 8kHz PHF), and 60Hz PLF), with a shelving characteristic on each band. AUX 1 The return signal PA) can be fed to the Aux 1 bus via this level control, allowing the tape return signal to be fed to an external processing device or artist headphone monitoring system.
  • Page 46 RETURN SECTION B RET/BUS This switch selects the input to the return section with its EQ. In the RET position, the input comes from the normal return input, is fed via the EQ, ON switch and PAN to the stereo mix. In the Bus position, the signal is taken from the group output, and fed as above to the stereo mix.
  • Page 47 PA/RECORDING This switch determines the way in which the return input is routed. In the PA mode, the metering will always read the group signal. If the Ret/Bus switch is also set to Bus at this time, the return input will take the group signal, and the external return signal will be routed to the same group bus.
  • Page 48 CONNECTORS AND PIN ASSIGNMENTS Group Output Q 3 Pin XLR Type, Balanced Nominal Output LevelQ +4dBu Por -10dBV) Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Output Impedance Q S75 Ohm Aux/Return Input Q TRS Jack Socket, ëAí Gauge, Balanced Nominal Input LevelQ +4dBu Por -10dBV) Tip Q Signal +ve PHot) Ring Q Signal -ve PCold)

  • Page 49: The Matrix Output Module

    THE MATRIX OUTPUT MODULE The Forum Matrix output module features the Group output Pnormally fader controlled), with a matrix sub-mix section comprising the group feed to the eight matrix buses, plus two external inputs to the matrix bus on that module. The Group output is normally controlled by a fader and the Matrix output by a rotary pot, but these two functions may be switch-reversed.
  • Page 50 5 Adjusts the level of the GROUP signal fed to MATRIX bus 5. 6 Adjusts the level of the GROUP signal fed to MATRIX bus 6. 7 Adjusts the level of the GROUP signal fed to MATRIX bus 7. 8 Adjusts the level of the GROUP signal fed to MATRIX bus 8. FADER MTRX Normally the GROUP output is controlled by the long fader, and the MATRIX signal by the rotary potentiometer.
  • Page 51 MIX/SUB L Routes the GROUP signal to the main LEFT bus, post-fader. MIX/SUB R Routes the GROUP signal to the main RIGHT bus, post-fader. FADER Controls the output level of the GROUP signal, unless FADER REVERSE has been pressed, when it will control the level of the MATRIX output signal.
  • Page 52 CONNECTORS AND PIN ASSIGNMENTS Group Output Q 3 Pin XLR Type, Balanced Nominal Output LevelQ +4dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Output Impedance Q S75 Ohm Matrix Output Q 3 Pin XLR Type, Balanced Nominal Output LevelQ +4dBu Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold)

  • Page 53: Composer Output Module

    COMPOSER OUTPUT MODULE This module was fitted in the FORUM COMPOSER which is no longer available. This information is included for the sake of existing owners. The Composer Output module provides control of the Group output signal, and monitoring of three tape returns. This provides 24-track monitoring on the eight group output modules.
  • Page 54 RET LEV Controls the overall level of the Tape return feed to the stereo mix bus. When pressed Pled illuminated) the tape return signal is enabled, or SOLO Feeds the tape return signal to the monitoring outputs and main stereo meters. The feed is internally selectable to be pre- or post- the level control.
  • Page 55 bus, and similarly for hard right. When the pan is in the centre, equal signal, approximately 4.5dB down, is fed to both left and right buses. RET LEV Controls the overall level of the Tape return feed to the stereo mix bus.
  • Page 56 CONNECTORS AND PIN DEFINITIONS Group OutputQ 3 pin XLR type, balanced Nominal Output LevelQ +4dBu P-10dBV) Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Output Impedance Q S75 Ohm Tape ReturnsQ 1/4O TRS Jack Socket, ëAí Gauge, balanced Nominal Input LevelQ +4dBu P-10dBV) Tip Q Signal +ve PHot) Ring Q Signal -ve PCold)

  • Page 57: Stereo Master Module

    STEREO MASTER MODULE The Stereo Master module contains the main stereo outputs, the Auxiliary master outputs, the monitoring section, and talkback microphone input. In addition, a BNC connector is provided for a gooseneck light if the console is to be operated under low or poor light conditions Pmaximum power 12 Volts, 5 watts).
  • Page 58 TALKBACK MIC A microphone may be plugged in to this socket to provide talkback facilities to the output buses for artists or tape. The microphone may be a Dynamic type, or using an internal link for phantom powering, may be a condenser microphone. TB GAIN This adjusts the level of the talkback microphone signal.
  • Page 59 MIX/2 TRK This switch selects the input to the monitoring system, from the stereo mix output or the external stereo input P2 Track). Selection of any SOLO/AFL signal will override the MIX/2 Track selection. The 10 way selector module may be connected to the 2 track input to increase the range of available sources.
  • Page 60 CONNECTORS AND PIN DEFINITIONS Mix Output Q 3 Pin XLR type, Balanced Nominal Output LevelQ +4dBu Por -10dBV) Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold) Pin 1 Q Ground Output Impedance Q S75 Ohm Mono Output Q 3 Pin XLR type, Balanced Nominal Output LevelQ +4dBu Por -10dBV) Pin 2 Q Signal +ve PHot) Pin 3 Q Signal -ve PCold)

  • Page 61: General Servicing

    GENERAL SERVICING Servicing should be referred to factory personnel, or your authorized DDA distributor. If you require to remove a module then follow the steps below. Remove the upper and lower identification strips by pulling carefully up at one end, then along, unclipping each section very carefully.

  • Page 62: Power Supply

    POWER SUPPLY The FORUM power supply is a rack mounting unit, occupying 2U of rack space. The unit is fan cooled but should still be given adequate ventillation and air circulation when installed. The AC mains input to the power supply can be between 90 volts and 240 volts 50 - 60Hz AC, with the operating voltage set by internal switches.

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