SoundCraft SM12 User Manual

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SOUNDCRAFT

USER GUIDE

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Summary of Contents for SoundCraft SM12

Page 1 SOUNDCRAFT USER GUIDE...
Page 2 Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. Soundcraft Electronics Ltd. shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual.
Page 3 Introduction Introduction Precautions and Safety Instructions Installation Connections Module Block Diagrams Input Module Module Description, Operation and Specification 18 Output Module Module Description, Operation and Specification 24 Master Module Module Description, Operation and Specification 28 Appendices Specification Notes Performance Specifications Configurations Dimensions Warranty...
Page 4 Introduction Introduction...
Page 5: Frame Sizes
• balanced inserts on all inputs Frame Sizes The SM12 is available in three frames sizes, 32, 40 and 48 channels. The consoles are configured, from left to right: • inputs 1 - 24 •...
Page 6 Metering Each input module has its own 8-segment bargraph meter and peak level indicator adjacent to the fader. The groups are metered by 16-segment bargraphs which are next to the faders on the output modules. The two 16-segment bargraphs on the Master module meter either the PFL/AFL signals or the Stereo Mix signal depending on the wedge default internal setting.
Page 7: General Precautions
In the event of an electrical storm, or large mains voltage fluctuations, immediately switch off the PSU and unplug from the mains. Always ensure that you use the correct PSU for your mixer. The SM12 uses the PSM300 power supply. Introduction...
Page 8: Signal Levels
Signal Levels It is important to supply the correct input levels to the console, otherwise signal to noise ratio or distortion performance may be degraded, and in extreme cases, damage to the internal circuitry may result. Likewise, on all balanced inputs avoid sources with large commonmode DC, AC or RF voltages, as these will reduce the available signal range on the inputs.
Page 9 Introduction...
Page 10: Installation
Installation Installation...
Page 11: Wiring Considerations
The SM12 is designed for reliability and high performance, and is built to the highest standards. Whilst great care has been taken to ensure that installations are made as troublefree as possible, care taken at this stage, followed by correct setting up will be rewarded by a long life and reliable operation.
Page 12: Wiring Conventions
Wiring conventions ⁄ The SM12 uses two different types of audio connector: 3-pin XLR and " 3-pole jacks. These are used in several configurations, as shown below. MICROPHONE INPUTS STEREO MIX L, R & WEDGE OUTPUTS TALKBACK MIC GROUP, TB & OSCILLATOR OUTPUTS TALKBACK INPUT "...
Page 13 Installation...
Page 14: Module Block Diagrams
Module Block Diagrams Module Block Diagrams...
Page 15 Input Module Module Block Diagrams...
Page 16 Group Output Module Module Block Diagrams...
Page 17 Master Module Module Block Diagrams...
Page 18 Stereo Mix Module Block Diagrams...
Page 19 Module Block Diagrams...
Page 20: Input Module
Input Module Input Module...
Page 21 Input The sensitivity of both the XLR and the HIGH IMPEDANCE (HI-Z jack) inputs is adjusted by the SENS control. Both inputs are electronically balanced. The +48V switch, when depressed, applies +48V phantom power to the input XLR for powering condenser microphones. The PHASE switch reverses the phase of the selected input.
Page 22: Stereo Mix
The Frequency Response Curves of the Equaliser LF Section HF Section 20.0 20.0 15.0 15.0 10.0 10.0 -5.0 -5.0 -10.0 -10.0 -15.0 -15.0 -20.0 -20.0 Frequency/Hz Frequency/Hz LF EQ HF EQ LMF Section HMF Section 20.0 20.0 15.0 15.0 10.0 10.0 -5.0 -5.0...
Page 23: Muting System
The signal in the module is turned on and off by the CUT switch and by the MUTE buses (see below). An integral red LED in the CUT switch indicates when the signal is cut. The Post-fader signal level is controlled by a 100mm FADER before being fed to the Groups and the Stereo Mix buses.
Page 24 Jumper Options (RH PCB) Function Options Default Insert point pre-EQ J1, J2, J3 jumpers IN for pre-EQ J4, J5, J6 jumpers IN for post-EQ Group 1-4 Pre-fade signal post-mute jumper IN for pre-mute jumper IN for post-mute Note: only one of the above two jumpers to be fitted at any one time. Group 5-8 Pre-fade signal post-mute jumper IN for pre-mute...
Page 25 Rear Connectors The connections to the rear connector panel are as follows: INPUT (3 pin female XLR) Pin 1 Ground Pin 2 Signal (Hot) Pin 3 Signal (Cold) HI-Z INPUT, INSERT RETURN (1/4" 3-pole Jack) Signal (Hot) Ring Signal (Cold) Sleeve Ground INSERT SEND, (1/4"...
Page 26: Group Output Module
Group Output Module Group Output Module...
Page 27: External Input
External Input An external input, from a jack socket on the rear panel, may be added to the group bus. The input is balanced with a sensitivity of +4dBu. The EXT IN control adjusts the level of the external signal to the group, it provides a maximum 10dB gain when it is fully clockwise.
Page 28: Jumper Options
Talkback The momentary TB switch feeds the signal from the TALKBACK MICROPHONE to the group output; it is independent of the Fader position and the CUT switch. The existing group output is dimmed by 6db, and the engineer’s wedge speaker is dimmed by 20dB while the TB switch is active. Talkback may also be routed to all the group buses simultaneously by the INT talkback function on the master module;...
Page 29 Input and Output Levels Insert Sends, Group Outputs (electronically balanced) Nominal level +4dBu Maximum output level +26dBu into 600Ω Output impedance <75Ω Insert Returns, External Inputs (electronically balanced) Sensitivity +4dBu Maximum i/p level +26dBu Input impedance >10KΩ balanced Rear Connectors External Inputs (1/4"...
Page 30: Master Module
Master Module Master Module...
Page 31 ‘on’. The momentary action FOH button initiates talkback to the front of house console using a Soundcraft proprietary system. The talkback mic signal is switched to the FOH OUT XLR, with a +15v DC common-mode voltage to signal the FOH console that talkback is occurring.
Page 32 External Input The MONO switch sums the external signal to mono before it is fed to the stereo mix. A stereo external input, from XLRs on the rear connector panel, may be added to the mix buses. The inputs are balanced with a sensitivity of +4dBu. The EXT IN control adjusts the level of the external signals, with 10dB of gain fully clockwise.
Page 33 Talkback may also be routed to all the group buses and the stereo mix bus simultaneously by the INT talkback function on this module; in this case the Group/Stereo CUT and fader will affect the talkback level. Output Switching The PHASE switch reverses the phase of both left and right outputs. The outputs themselves are electronically balanced at +4dBu, on male XLRs on the rear panel.
Page 34 The PFL TRIM control gives +/-10dB of level trim for PFL/LISTEN signals. When INPUT PRIORITY is selected by the ENBL switch, an active PFL or LISTEN will replace any AFL signals, which will be audible only when all the PFL/LISTENs are released. When AUTO CANCEL is activated by the ENBL button, any AFL or PFL will cancel any currently active solo, so only one AFL or PFL can be active at once.
Page 35 Oscillator The oscillator, activated by the ON switch, produces pink noise or tone. The oscillator signal is fed to the oscillator output, balanced at a nominal level of +4dBu, on a 1/4" jack socket on the rear connector panel. The oscillator can also be fed to the group and stereo mix busses by pressing the TALKBACK/OSC TO BUSSES ‘INT’...
Page 36 Input and Output Levels INSERT SENDS, MIX, WEDGE AND FOH TALKBACK OUTPUTS (Electronically Balanced) nominal level +4dBu maximum output level +26dBu into 600Ω output impedance <75Ω OSCILLATOR OUTPUT (Electronically Balanced) nominal level +4dBu maximum output level +14dBu into 600Ω output impedance <75Ω...
Page 37 Rear Connectors External (FOH) Talkback In and Talkback Mic (3-pin female XLR) Pin 1 Ground Pin 2 Signal Hot Pin 3 Signal Cold Insert Returns, Ext. Inputs (1/4" 3-pole Jack) Signal Hot Ring Signal Cold Sleeve Ground Insert Sends, Oscillator Output (1/4" 3-pole Jack) Signal Hot Ring Signal Cold...
Page 38 Appendices Appendices...
Page 39 SPECIFICATION NOTES AND CONDITIONS A The Console has a nominal output level of +4dBu: all input sensitivities are relative to this, i.e., with line input gain set to ’0’, an input of 0dBu will give an output of +4dBu at any group or mix output, and a sensitivity of +4dBu gives unity gain from input to output.
Page 40: Frequency Response
Measured on a 40 channel console. Frequency response Line input to any output: 20Hz - 20kHz, +0/-0.5dB Crosstalk (measured at 1kHz) Channel CUT isolation >100dB Channel Fader isolation >95dB Channel Send Pot isolation >75dB Group Fader isolation >95dB Group CUT isolation >95dB Noise (22Hz-22kHz bw, unweighted rms)
Page 41 Master Inputs 1-24 Outputs Inputs 25+ Console Rear View External Inputs Socket Appendices...
Page 42 SM12 Outline Dimensions All dimensions are in millimetres 32 Channel = 1392mm 40 Channel = 1646mm 48 Channel = 1900mm 262.28 9.80 110.10 722.80 Appendices...
Page 43 Equipment has been properly installed in accordance with instructions contained in Soundcraft’s manual; and b) the End User has notified Soundcraft or the Dealer within 14 days of the defect appearing; and c) no persons other than authorised representatives of Soundcraft or the Dealer have effected any replacement of parts maintenance adjustments or repairs to the Equipment;...
Page 44 Auxiliary Send an output from the console comprising a mix of signals from channels and groups derived independently of themain stereo group mixes. Typically the feeds to the mix are implemented on rotary level controls. Balance the relative levels of the left and right channels of a stereo signal. Clipping the onset of severe distortion in the signal path, usually caused by the peak signal voltage being limited by the circuit’s power supply voltage.
Page 45 Appendices...