Page 2 - PRECAUTIONS; PLEASE READ CAREFULLY BEFORE PROCEEDING; * Please keep this manual in a safe place for future reference.; WARNING
MG12/4FX 2 PRECAUTIONS PLEASE READ CAREFULLY BEFORE PROCEEDING * Please keep this manual in a safe place for future reference. WARNING Always follow the basic precautions listed below to avoid the possibility of serious injury or even death from electrical shock, short-circuiting, damages, fire or o...
Page 3 - IMPORTANT NOTICE FOR THE UNITED KINGDOM
MG12/4FX 3 Always turn the power off when the device is not in use. Even when the power switch is in the “STANDBY” position, electricity is still flowing to the device at the minimum level. When you are not using the device for a long time, make sure you unplug the power cord from the wall AC outlet...
Page 4 - Introduction; Contents; Introduction 4; Setting Up; Features
Introduction MG12/4FX 4 Introduction Thank you for your purchase of the YAMAHA MG12/4FX mixing console. The MG12/4FX features input channels suitable for a wide range of usage environments, and includes high-quality built-in digital effects that can provide some very serious sound. The mixer combine...
Page 5 - Before Turning on the Mixer
Introduction MG12/4FX 5 Before Turning on the Mixer Be sure that the mixer’s power switch is in the STANDBY position. Use only the PA-20 adaptor included with thismixer. Use of a different adaptor may result inequipment damage, overheating, or fire. Connect the power adaptor to the AC ADAPTOR IN con...
Page 6 - Making the Most Of Your Mixer; An Introduction; The Venerable RCA Pin Jack; A Place For Everything and Everything In Its Place
MG12/4FX 6 Making the Most Of Your Mixer Making the Most Of Your Mixer ■ An Introduction You’ve got yourself a mixer and now you’re ready to use it. Just plug everything in, twiddle the controls, and away you go … right? Well, if you’ve done this before you won’t have any problems, but if this is th...
Page 7 - The Sturdy XLR
Making the Most Of Your Mixer MG12/4FX 7 ■ The Sturdy XLR This type of connector is generally referred to as “XLR-type,” and almost always carriesa balanced signal. If the corresponding circuitry is designed properly, however,XLR-type connectors will also handle unbalanced signals with no problem. M...
Page 8 - A balanced cable has three conductors:; -3. Signal Levels—Decibel Do’s and Don’ts
MG12/4FX 8 Making the Most Of Your Mixer A balanced cable has three conductors: 1) A ground conductor which carries no signal, just the “ground” or “0” reference against which the signal in the otherconductors fluctuates. 2) A “hot” or “+” conductor which carries the normal-phase audio signal. 3) A ...
Page 9 - ed Mixer Block Diagram; Where Your Signal Goes Once It’s Inside the Box
Making the Most Of Your Mixer MG12/4FX 9 At first glance the block diagram of even a modest mixer can look like a space-station schematic. In reality, block diagrams area great aid in understanding how the signal flows in any mixer. Here’s a greatly simplified block diagram of a generic mixer tohelp...
Page 10 - er “Gain” Control Is the Key!; The First Steps in Achieving Great Sound
MG12/4FX 10 Making the Most Of Your Mixer Before you even consider EQ and effects, or even the overall mix, it is important to make sure that levels are properly set foreach individual source. This can’t be stressed enough—initial level setup is vitally important for achieving optimum perfor-mance f...
Page 11 - -2. Level Setup Procedure For Optimum Performance
Making the Most Of Your Mixer MG12/4FX 11 3-2. Level Setup Procedure For Optimum Performance Now that we know what we have to do, how do we do it? If you take another quick look at the mixer block diagram you’ll noticethat there’s a peak indicator located right after the head amplifier and EQ stages...
Page 12 - and Overall Effects
MG12/4FX 12 Making the Most Of Your Mixer 4-1. AUX Buses For Monitor Sends and Overall Effects There are a number of reasons why you might want to “tap”the signal flowing through your mixer at some point beforethe main outputs: the two most common being 1) to create amonitor mix that is separate fro...
Page 14 - c Processing
MG12/4FX 14 Making the Most Of Your Mixer 4-3. Channel Inserts for Channel-speci fi c Processing Another way to get the mixer’s signal outside the box is to use the channel inserts. The channel inserts are almost always locatedbefore the channel fader and, when used, actually “break” the mixer’s int...
Page 15 - Faders Down; Vocal Ballad Backed by Piano Trio; Music First—Then Mix; Making Better Mixes
Making the Most Of Your Mixer MG12/4FX 15 5-1. Approaching the Mix—Where Do You Start? Mixing is easy, right? Just move the faders around until itsounds right? Well, you can do it that way, but a more sys-tematic approach that is suited to the material you’re mixingwill produce much better results, ...
Page 17 - Channel Control Section; GAIN Control; PEAK Indicator; AUX Control
Front & Rear Panels MG12/4FX 17 Front & Rear Panels Channel Control Section 1 GAIN Control Adjusts the input signal level.To get the best balance between the S/N ratio and thedynamic range, adjust the level so that the PEAK indica-tor ( 2 ) comes on only at about maximum input level. The –60...
Page 18 - PRE Switch; EFFECT Controls; GROUP Switch; Channel Fader
Front & Rear Panels MG12/4FX 18 6 PRE Switch Selects whether the pre-fader or the post-fader signal isfed to the AUX bus. If you set the switch on ( ), the mixer sends the pre-fader signal (the signal prior to pas-sage through channel fader B ) to the AUX bus, so that AUX output is not affected ...
Page 19 - Master Control Section; ST Master Fader; TO ST Switch; Master SEND; RETURN; TR IN Control
Front & Rear Panels MG12/4FX 19 Master Control Section 1 ST Master Fader Adjusts the signal level to the ST OUT jacks. 2 GROUP 1-2 Fader Adjusts the signal level to the GROUP OUT 1 andGROUP OUT 2 jacks. 3 TO ST Switch If this switch is on ( ), the mixer sends the signals pro- cessed by the GROUP...
Page 20 - PHONES Jack; PFL
Front & Rear Panels MG12/4FX 20 8 Level-Meter Signal Switches (ST-GROUP Toggle Switch and 2TR IN Switch) These level-meter switches, together with the channelPFL switches, select the signal that is sent through theC-R/PHONES control to the C-R OUT jacks, thePHONES jack, and the level meterThe fo...
Page 21 - Rear Input/Output Section; Channel Input Jacks
Front & Rear Panels MG12/4FX 21 Rear Input/Output Section 1 Channel Input Jacks • MIC jacks (CHs 1 to 4, 5/6, 7/8) These are balanced XLR-type microphone input jacks(1:Ground; 2:Hot; 3:Cold). • LINE jacks (CHs 1 to 4) These are balanced TRS phone-type line input jacks (T:Hot; R:Cold; S:Ground).Y...
Page 22 - SEND Jacks; TR IN Jacks; AC ADAPTOR IN Connector; Connector Polarities
Front & Rear Panels MG12/4FX 22 7 SEND Jacks • AUX This is an impedance balanced phone-type output jack. This jack outputs the signals from AUX bus, respec-tively. You use this jack, for example, to connect to aneffector or to a cue box or other such monitoring sys-tem. • EFFECT This is an imped...
Page 23 - Setup Procedure; Setup Examples; Home Recording
Setting Up MG12/4FX 23 Setting Up Setup Procedure Before connecting to microphones and instruments, be sure that all devices are turned off. Also be sure that all of the mixer’s channel faders and master control faders are set all the way down. For each connection, connect one end of the cable to th...
Page 24 - Sound Reinforcement for Live Performance
Setting Up MG12/4FX 24 ■ Sound Reinforcement for Live Performance ST AUX (PRE ) ST ( ) DI Microphones Monitor Speakers (Internal) Power Amp CD, Cassette, or DAT Recorder Synthesizer Effector Bass CD Player Microphones Headphones Main Speakers (External) Example of Speaker Arrangement Audience (Exter...
Page 25 - Rack Mounting; Mounting the MG12/4FX
Setting Up MG12/4FX 25 Rack Mounting ■ Mounting the MG12/4FX Two metal rack-mount supports are screwed onto the unit. Use a screwdriver to remove these supports. Turn the supports over, and fasten them into place again using the same screws. Mount the unit into the rack, and fasten it into place. Do...
Page 26 - Appendix; Electrical Characteristics
Appendix MG12/4FX 26 Appendix Speci fi cations ■ Electrical Characteristics Where 0 dBu = 0.775 V ■ General Speci fi cations Where 0 dBu = 0.775 V Conditions MIN TYP MAX UNIT Total Harmonic Distortion(MIC to ST OUT) (THD+N) 20 Hz-20 kHz @+14 dBu 600 ohms (CH1 to 4) with Signal input CH ST Switches a...
Page 27 - Input Speci
Appendix MG12/4FX 27 ■ Input Speci fi cations Where 0 dBu = 0.775 V and 0 dBV= 1 V * Input sensitivity: the lowest level that will produce the nominal output level when the unit is set to maximum gain. ■ Output Speci fi cations Where 0 dBu = 0.775 V and 0 dBV= 1 V Specifications and descriptions in ...
Page 28 - Dimensional Diagrams
Appendix MG12/4FX 28 Dimensional Diagrams 317.4 416.6 325.6 102.6 2 108 322 480 322 When mounted on rack Unit: mm
Page 29 - Block Diagram and Level Diagram
Appendix MG12/4FX 29 Block Diagram and Level Diagram
Page 30 - MEMO
