Yamaha MG20XU mixer training part two

this part here is called the auxiliary section now the way to think of this is you think of the audio path as like an MRT line okay a train line each of these blue knobs and the white knob is like a station so the sound can get off the main line at any of these stations and go onto a branch line okay it's a bit like changing from MRT to LRT so you think of this as MRT the blue and the white is like LRT smaller lines going off okay so if the the knob is all the way down then the station is shut okay nobody can get off as you turn it up you divert some of the sound okay now the reason that we need this is that we often have other destinations that we need to send the sound to allow me to explain so you have this speaker that's hung up here alright and this is called house or front of house speaker right and this is for the audience to hear right everyone knows this right we've all seen PA systems like this good now the question is can the performer hear the front of house speaker not really he can hear the low and low mid frequencies that come off the back but if you've ever stood behind a speaker you will know that the sound is not very clear coming from the back and there's a good reason for that so how can he hear himself excellent right so you have to put another speaker on stage pointing at the artists right and these are called good well done okay so these are called Mansoor monitor speakers all right so you now have two separate sets of speakers you have front-of-house and you have monitors so you need a way to divert the sound to go to the monitors because that's where the auxiliaries come in okay so in a typical band situation you will have different monitors on the stage okay so let's say we have a stage all right we have we have drums right maybe we have bass we have right keys we have a lead singer right and maybe we have a guitar player all right each of these people needs to be able to hear okay so you know you have a you have a speaker here you have a speaker here speaker here speaker here and then if the drummer's lucky we'll have one there each of these people needs to hear a specific combination of sounds so for example the lead singer right what does the lead singer need to hear exactly right so singers must hear themselves otherwise it's like trying to sing with your your fingers in your ears right so lead singer needs to hear himself more first and foremost all right chances are he can hear the drums because the drama is right behind him right probably can hear the bass from the bass amplifier and so on so many lead singers they want only their voice in that monitor okay so this this combination of sounds that he wants to hear is referred to as a monitor mix right so maybe you assign him one right then the guitarist will call it to right keyboard maybe we'll call it three drums and bass maybe four right because drums and bass typically need similar things okay so you can say that you have four different monitor mixes here and that is why you have so many of these you can see on this you have three blue and one white okay so this is why you have these extra stops on the MRT line does everyone follow that argument yeah okay and the idea is that when you mix a show you are not just controlling one mix right the faders are one mix when you control this you are controlling what you hear right yeah when you control these you are controlling what's on stage it's not always like that but generally speaking faders are for front-of-house this one okay and the knobs are for ya all right so this brings us to the concept of this pre and post fade auxiliary sent what I'm gonna do is I'm going to use this adapter okay I'm gonna unplug from the left speaker excuse me I'm gonna unplug from the left output and I'm gonna connect this to the aux to output okay so now obviously check one two you you can hear that this because no sound now right because I unplugged it okay so I'm gonna bring this fader all the way down no sound because fader is all the way down I faded out that speaker now I'm going to bring this is in ox2 I'm gonna bring my ox to master up okay this is the master for this output same as this is the master for the the front-of-house then what I'll do is I will bring up my sorry wrong channel I'm gonna bring this up check check one two check 1 2 so you can hear that there sound alright notice that the fader is still down this configuration is called prefab ox sin alright and the logic is that no matter what you do with the fader so now that's because starting to make sound no sound notice that this does not change yeah and the reason for that is that when you are mixing a show you are constantly making small changes here right you don't want the guys monitor to be getting louder and softer you're driving crazy this allows us to have a signal onstage that is constant all right now what I'm going to do is I'm going to press this button and you notice the sound has disappeared okay now what we do is we'll bring this up okay check check one two check one two notice that the sound has come back so now this is tracking the fader check one two check one two check check one two check one two okay this is post fate auxiliary sent okay monitors are generally run pre-fit and there is a use for the post fit but you know this this can really confuse some people again your seniors will guide you when you actually when you actually implement that now that's a very good question it depends on the mixer okay on this mixer all of the aux ends are post EQ so in other words the changes that you make here affects what the artists here is onstage on the more expensive boards it is switchable related to this is what happens when we turn the channel on and off do you think this still works let's find out so it's on I'm gonna turn the channel off check check one two no sound okay so you must remember that the channel on/off affects all of your ox ends as well right so if this is of everything dies and there's a very good reason for that in live sound if you have a feedback emergency on stage you may not know which of these five speakers is feeding back so it's good to be able to just turn everything off okay and if it's in the middle of a song sometimes just turning it off for how a second can be enough to deal with a problem okay so same thing you notice if I bring up the fader no sound anywhere okay if I turn it on now we have sound in both speakers all right so the last thing all right we've covered this this red knob this red knob is your pan control okay listen so check one two yeah over on the left check one two over on the right and this is call center right what what's the point of having this any when would you use this pan controller when do you wanna only half the audience to be able to hear stuff no yeah I a number of you're shaking your head right so the answer is that in live sound we almost never pan stuff to heart laugh or heart right and the reason for that is that typically the audience on the left side can hear the right speakers all right and so on the the exception to this is when you have a stereo source that is connected to two mono channels now this is not the correct connect this right but this is just for illustration so some mixers have no stereo channels the Mackie is a good example so when you bring a stereo channel in you must connect it to two mono channels like this alright again this is just for illustration so when you do this you will pan the left signal hard left so we find 11 you pan this hard left and the right signal heart right and your pan controls will look like this okay this will create the correct stereo image if you leave them in the middle what you are doing is you are basically turning it into a mono signal alright so that's an example of when you would pan them so you have on/off switch we've explained that this peak light okay I didn't cover it just now but if you turn check one two if you turn your gain too high you can see that I'm right at the top of the meters okay can you see the peak light is flashing okay this serves to warn you that you are driving the channel into distortion right and this is a very ugly sound so I'm gonna turn the channel on I'm gonna bring the fader up just a little bit so you can hear what it sounds like okay so check one two check check one two check one two right that's not good okay you do not want to hear that so that's what this this if you see this thing staying on you must bring your gain down okay if it flashes now and then it's okay but it must not stay on okay below that you have one two three four and s T and P FL you guys probably noticed that there are a couple of faders here that are labeled group 1 2 and group 3 4 ok so at this point it's important to understand that once the signal gets to here it goes across and it goes out of the mixer there are different ways that you can route it if your Esty Esty stands for stereo okay if your s T is down it goes directly to this one and it goes out of the board that is how you will operate 90% of the time okay so you must double check that this is down if it is not down the signal goes nowhere alright these three switch just say when the signal reaches the bottom where do you want me to go alright so make sure your s T is down the other two group 1 2 & 3 4 serve to allow you to group or to segregate your channels in a certain way okay why would you want to do this let's say that you have 4 backing singers ok on the first 4 channels you do the soundcheck you discover okay number 1 is quite soft number 2 is louder number three is in the middle number 4 is like real soft okay so you have them all nicely balanced let's say that during the concert you suddenly discover oh they are all just a little bit too loud right how are you gonna deal with it you could try and bring all the faders down right but then chances is that you will lose track of the relative positioning so what you can do is you can group them into a single fader so what you do is you you'd unassigned them from st and you press in one two on all four then what will happen is that these four will go here and from there you send them to st alright so that means that say all your backing singers are too soft go up a little bit all backing singers too loud go down a little bit alright so this is the live sound application typically you have two of these you can use say one to four drums you know three for backing singers or some engineers prefer one two is all the instruments 3/4 all the vocals okay it's up to you now the recording guys will use the groups to send to their recorder these have outputs on the back of the board so there are separate group outputs okay if you look at the back of the board you'll see that it says aux 1 2 4 and then the bottom it says group out ok the group outs can be used in a similar way to the Oxus to send signal to other destinations typically you might use them the Oxus are used for stage monitors right the groups maybe you use them for front fills or delays on bigger systems that sort of thing alright so that's what the groups do if in doubt make sure that your s T's are all down ok yeah even under the larger boards I personally don't use groups all that much ok the exception is where you mix stuff like for example musicals where you have an orchestra and you sometimes need to turn the orchestra up or down or something like that okay the last one pfl we know fader the only other thing that we need to understand is that the fader should usually be somewhere near zero okay this is called unity you will see some engineers where their faders are always way down at the bottom okay this is not good because it means your gain is set too high you see other engineers whose faders away at the top again that one chances are gain is too low all right the middle of the fader has the greatest resolution meaning that it gives you the greatest precision when it comes to adjusting the sound at the bottom moving just a couple mm you'll get 10 DB of change alright good you

Channel: GLB Productions

Views: 96,155

Keywords: live sound, sound reinforcement, training, Yamaha, MG series, MG20XU, mixer

Id: qalT74rf2ts

Length: 16min 49sec (1009 seconds)

Published: Wed Feb 12 2020